1.19.4 RB 2

Co-authored-by: malte0811 <[email protected]>

.github/support.yml

@@ -1,16 +0,0 @@
-# Configuration for support-requests - https://github.com/dessant/support-requests
-
-# Label used to mark issues as support requests
-supportLabel: Forum
-# Comment to post on issues marked as support requests. Add a link
-# to a support page, or set to `false` to disable
-supportComment: >
-  👋 We use the issue tracker exclusively for final bug reports and feature requests.
-  However, this issue appears to be better suited for the
-  [Forge Support Forums](http://www.minecraftforge.net/forum/forum/18-support-bug-reports/).
-  Please create a new topic on the support forum with this issue, and the conversation can
-  continue there.
-# Whether to close issues marked as support requests
-close: true
-# Whether to lock issues marked as support requests
-lock: true

.github/workflows/comments.yml

@@ -0,0 +1,16 @@
+name: 'Comment actions'
+
+on: issue_comment
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+  discussions: write
+
+jobs:
+  labels:
+    uses: MinecraftForge/SharedActions/.github/workflows/comment_actions.yml@main
+    secrets:
+      GH_APP_KEY: ${{ secrets.GH_APP_KEY }}
+      GH_APP_NAME: ${{ secrets.GH_APP_NAME }}

.github/workflows/issues.yml

@@ -0,0 +1,16 @@
+name: 'Issue actions'
+
+on: issues
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+  discussions: write
+
+jobs:
+  labels:
+    uses: MinecraftForge/SharedActions/.github/workflows/issue_actions.yml@main
+    secrets:
+      GH_APP_KEY: ${{ secrets.GH_APP_KEY }}
+      GH_APP_NAME: ${{ secrets.GH_APP_NAME }}

.github/workflows/pull_request_review.yml

@@ -0,0 +1,13 @@
+name: 'PR Review'
+
+on: pull_request_review
+
+jobs:
+  upload_payload:
+    name: Upload payload
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/upload-artifact@v3 # Payload artifact is consumed in Actionable
+        with:
+          name: payload
+          path: ${{ github.event_path }}

.github/workflows/pull_request_review_comment.yml

@@ -0,0 +1,13 @@
+name: 'PR Review Comment'
+
+on: pull_request_review_comment
+
+jobs:
+  upload_payload:
+    name: Upload payload
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/upload-artifact@v3 # Payload artifact is consumed in Actionable
+        with:
+          name: payload
+          path: ${{ github.event_path }}

.github/workflows/pull_request_review_comment_run.yml

@@ -0,0 +1,20 @@
+name: 'Pull Request Review Comment actions'
+
+on:
+  workflow_run:
+    workflows: [PR Review Comment]
+    types:
+      - completed
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+  discussions: write
+
+jobs:
+  labels:
+    uses: MinecraftForge/SharedActions/.github/workflows/pr_review_comment_actions.yml@main
+    secrets:
+      GH_APP_KEY: ${{ secrets.GH_APP_KEY }}
+      GH_APP_NAME: ${{ secrets.GH_APP_NAME }}

.github/workflows/pull_request_review_run.yml

@@ -0,0 +1,20 @@
+name: 'Pull Request Review actions'
+
+on:
+  workflow_run:
+    workflows: [PR Review]
+    types:
+      - completed
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+  discussions: write
+
+jobs:
+  labels:
+    uses: MinecraftForge/SharedActions/.github/workflows/pr_review_actions.yml@main
+    secrets:
+      GH_APP_KEY: ${{ secrets.GH_APP_KEY }}
+      GH_APP_NAME: ${{ secrets.GH_APP_NAME }}

.github/workflows/pull_requests.yml

@@ -0,0 +1,18 @@
+name: 'Pull Request actions'
+
+on:
+  pull_request_target:
+    types: [assigned, unassigned, labeled, unlabeled, opened, edited, closed, reopened, synchronize, converted_to_draft, ready_for_review, locked, unlocked, review_requested, review_request_removed, auto_merge_enabled, auto_merge_disabled]
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+  discussions: write
+
+jobs:
+  labels:
+    uses: MinecraftForge/SharedActions/.github/workflows/pr_actions.yml@main
+    secrets:
+      GH_APP_KEY: ${{ secrets.GH_APP_KEY }}
+      GH_APP_NAME: ${{ secrets.GH_APP_NAME }}

.github/workflows/push.yml

@@ -0,0 +1,16 @@
+name: 'Push actions'
+
+on: push
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+  discussions: write
+
+jobs:
+  labels:
+    uses: MinecraftForge/SharedActions/.github/workflows/push_actions.yml@main
+    secrets:
+      GH_APP_KEY: ${{ secrets.GH_APP_KEY }}
+      GH_APP_NAME: ${{ secrets.GH_APP_NAME }}

.gitignore

@@ -34,6 +34,7 @@
 /repo/
 src/generated/resources/.cache/
 src/generated_test/resources/.cache/
+src/generated_mdk/resources/.cache/
 
 #Patch rejects
 /patches-/

.teamcity/settings.kts

@@ -1,5 +1,7 @@
 import jetbrains.buildServer.configs.kotlin.v2019_2.*
 import jetbrains.buildServer.configs.kotlin.v2019_2.projectFeatures.githubIssues
+import jetbrains.buildServer.configs.kotlin.*
+import jetbrains.buildServer.configs.kotlin.v2019_2.buildSteps.gradle
 
 /*
 The settings script is an entry point for defining a TeamCity
@@ -30,11 +32,13 @@ project {
     buildType(Build)
     buildType(BuildSecondaryBranches)
     buildType(PullRequests)
+    buildType(PullRequestChecks)
+    buildType(PullRequestCompatibility)
 
     params {
         text("docker_jdk_version", "17", label = "Gradle version", description = "The version of the JDK to use during execution of tasks in a JDK.", display = ParameterDisplay.HIDDEN, allowEmpty = false)
-        text("docker_gradle_version", "7.4", label = "Gradle version", description = "The version of Gradle to use during execution of Gradle tasks.", display = ParameterDisplay.HIDDEN, allowEmpty = false)
-        text("git_main_branch", "1.18.x", label = "Git Main Branch", description = "The git main or default branch to use in VCS operations.", display = ParameterDisplay.HIDDEN, allowEmpty = false)
+        text("docker_gradle_version", "7.5.1", label = "Gradle version", description = "The version of Gradle to use during execution of Gradle tasks.", display = ParameterDisplay.HIDDEN, allowEmpty = false)
+        text("git_main_branch", "1.20.x", label = "Git Main Branch", description = "The git main or default branch to use in VCS operations.", display = ParameterDisplay.HIDDEN, allowEmpty = false)
         text("git_branch_spec", """
                 +:refs/heads/(main*)
                 +:refs/heads/(master*)
@@ -134,3 +138,71 @@ object PullRequests : BuildType({
         """.trimIndent()
     }
 })
+
+object PullRequestChecks : BuildType({
+    templates(AbsoluteId("MinecraftForge_BuildPullRequests"), AbsoluteId("MinecraftForge_SetupGradleUtilsCiEnvironmen"), AbsoluteId("MinecraftForge_BuildWithDiscordNotifications"), AbsoluteId("MinecraftForge_SetupProjectUsingGradle"))
+    id("MinecraftForge_MinecraftForge__PullRequestChecks")
+    name = "Pull Requests (Checks)"
+    description = "Checks pull requests for the project"
+
+    steps {
+        gradle {
+            name = "Check"
+            id = "RUNNER_10_Check"
+
+            tasks = "checkAll"
+            gradleParams = "--continue %gradle_custom_args%"
+            enableStacktrace = true
+            dockerImage = "%docker_gradle_image%"
+            dockerRunParameters = """
+                -v "/opt/cache/agent/gradle:/home/gradle/.gradle"
+                -v "/opt/cache/shared/gradle:/home/gradle/rocache:ro"
+                --network=host
+                -u 1000:1000
+                %docker_additional_args%
+            """.trimIndent()
+        }
+    }
+
+    vcs {
+        branchFilter = """
+            +:*
+            -:1.*
+            -:<default>
+        """.trimIndent()
+    }
+})
+
+object PullRequestCompatibility : BuildType({
+    templates(AbsoluteId("MinecraftForge_BuildPullRequests"), AbsoluteId("MinecraftForge_SetupGradleUtilsCiEnvironmen"), AbsoluteId("MinecraftForge_BuildWithDiscordNotifications"), AbsoluteId("MinecraftForge_SetupProjectUsingGradle"))
+    id("MinecraftForge_MinecraftForge__PullRequestCompatibility")
+    name = "Pull Requests (Compatibility)"
+    description = "Validates binary compatibility for pull requests made to the project"
+
+    steps {
+        gradle {
+            name = "Validate"
+            id = "RUNNER_10_Compatibility"
+
+            tasks = "checkJarCompatibility"
+            gradleParams = "--continue %gradle_custom_args%"
+            enableStacktrace = true
+            dockerImage = "%docker_gradle_image%"
+            dockerRunParameters = """
+                -v "/opt/cache/agent/gradle:/home/gradle/.gradle"
+                -v "/opt/cache/shared/gradle:/home/gradle/rocache:ro"
+                --network=host
+                -u 1000:1000
+                %docker_additional_args%
+            """.trimIndent()
+        }
+    }
+
+    vcs {
+        branchFilter = """
+            +:*
+            -:1.*
+            -:<default>
+        """.trimIndent()
+    }
+})

build.gradle

@@ -1,4 +1,10 @@
 import groovy.json.JsonBuilder
+import net.minecraftforge.forge.tasks.checks.CheckATs
+import net.minecraftforge.forge.tasks.checks.CheckExcs
+import net.minecraftforge.forge.tasks.checks.CheckPatches
+import net.minecraftforge.forge.tasks.checks.CheckSAS
+import net.minecraftforge.forge.tasks.checks.CheckTask
+import net.minecraftforge.forge.tasks.checks.CheckMode
 
 import java.nio.file.Files
 import java.util.Date
@@ -13,15 +19,16 @@ import net.minecraftforge.gradle.common.tasks.SignJar
 import net.minecraftforge.gradle.userdev.tasks.RenameJar
 import org.apache.tools.ant.filters.ReplaceTokens
 import org.gradle.plugins.ide.eclipse.model.SourceFolder
+import org.objectweb.asm.Opcodes
 
 plugins {
     id 'org.cadixdev.licenser' version '0.6.1'
     id 'com.github.ben-manes.versions' version '0.36.0'
     id 'net.minecraftforge.gradleutils' version '2.+'
     id 'eclipse'
-    id 'de.undercouch.download' version '4.1.2'
-    id 'net.minecraftforge.gradle.patcher' version '[5.1.39,)' apply false
-    id 'net.minecraftforge.gradle.mcp' version '[5.1.39,)' apply false
+    id 'de.undercouch.download' version '5.1.3'
+    id 'net.minecraftforge.gradle.patcher' version '[5.1.77,5.2.0)' apply false
+    id 'net.minecraftforge.gradle.mcp' version '[5.1.77,5.2.0)' apply false
 }
 
 Util.init() //Init all our extension methods!
@@ -36,17 +43,18 @@ ext {
         ]
     }
     MAPPING_CHANNEL = 'official'
-    MAPPING_VERSION = '1.19'
-    MC_VERSION = '1.19'
-    MCP_VERSION = '20220607.102129'
-    SPI_VERSION = '4.0.10'
+    MAPPING_VERSION = '1.19.4'
+    MC_VERSION = '1.19.4'
+    MC_NEXT_VERSION = '1.20'
+    MCP_VERSION = '20230314.122934'
+    SPI_VERSION = '6.0.0'
     ACCESSTRANSFORMERS_VERSION = '8.0.4'
     COREMODS_VERSION = '5.0.1'
-    EVENTBUS_VERSION = '5.0.3'
-    MODLAUNCHER_VERSION = '9.1.3'
-    SECUREJARHANDLER_VERSION = '1.0.3'
-    BOOTSTRAPLAUNCHER_VERSION = '1.0.0'
-    ASM_VERSION = '9.3'
+    EVENTBUS_VERSION = '6.0.3'
+    MODLAUNCHER_VERSION = '10.0.8'
+    SECUREJARHANDLER_VERSION = '2.1.6'
+    BOOTSTRAPLAUNCHER_VERSION = '1.1.2'
+    ASM_VERSION = '9.5'
     INSTALLER_VERSION = '2.1.+'
     MIXIN_VERSION = '0.8.5'
     TERMINALCONSOLEAPPENDER_VERSION = '1.2.0'
@@ -55,13 +63,14 @@ ext {
     JETBRAINS_ANNOTATIONS_VERSION = '23.0.0'
     SLF4J_API_VERSION = '1.8.0-beta4'
     APACHE_MAVEN_ARTIFACT_VERSION = '3.8.5'
+    JARJAR_VERSION = '0.3.19'
 
     // These versions should be kept in sync with the version manifest JSON
     // To use a version newer than the version manifest JSON, the dependency must be added to the installer configuration
-    MOJANG_LOGGING_VERSION = '1.0.0'
-    LOG4J_VERSION = '2.17.0'
-    GUAVA_VERSION = '31.0.1-jre'
-    GSON_VERSION = '2.8.9'
+    MOJANG_LOGGING_VERSION = '1.1.1'
+    LOG4J_VERSION = '2.19.0'
+    GUAVA_VERSION = '31.1-jre'
+    GSON_VERSION = '2.10'
     APACHE_COMMONS_LANG3_VERSION = '3.12.0'
     JOPT_SIMPLE_VERSION = '5.0.4'
     COMMONS_IO_VERSION = '2.11.0'
@@ -75,7 +84,7 @@ ext {
     INSTALLER_TOOLS = 'net.minecraftforge:installertools:1.3.0'
     JAR_SPLITTER = 'net.minecraftforge:jarsplitter:1.1.4'
     FART = 'net.minecraftforge:ForgeAutoRenamingTool:0.1.22:all'
-    MIN_TAG_FOR_CHANGELOG = "39.0"
+    MIN_TAG_FOR_CHANGELOG = '41.0'
 }
 
 println('Version: ' + VERSION +
@@ -94,7 +103,7 @@ def extraTxts = [
 ]
 
 task downloadVersionManifest(type: Download) {
-    src 'https://launchermeta.mojang.com/mc/game/version_manifest_v2.json'
+    src 'https://piston-meta.mojang.com/mc/game/version_manifest_v2.json'
     dest file('build/versions/version_manifest.json')
     useETag 'all'
     onlyIfModified true
@@ -260,6 +269,7 @@ def sharedDeps = {
     moduleonly "org.ow2.asm:asm-util:${ASM_VERSION}"
     moduleonly "org.ow2.asm:asm-analysis:${ASM_VERSION}"
     moduleonly "cpw.mods:bootstraplauncher:${BOOTSTRAPLAUNCHER_VERSION}"
+    moduleonly "net.minecraftforge:JarJarFileSystems:${JARJAR_VERSION}"
 
     installer "cpw.mods:securejarhandler:${SECUREJARHANDLER_VERSION}"
     installer "org.ow2.asm:asm:${ASM_VERSION}"
@@ -283,6 +293,8 @@ def sharedDeps = {
     installer "org.jline:jline-terminal:${JLINE_VERSION}" // Dep of TerminalConsoleAppender
     installer "org.spongepowered:mixin:${MIXIN_VERSION}"
     installer 'org.openjdk.nashorn:nashorn-core:15.3'
+    installer "net.minecraftforge:JarJarSelector:${JARJAR_VERSION}"
+    installer "net.minecraftforge:JarJarMetadata:${JARJAR_VERSION}"
 
     /*
     installer 'org.lwjgl:lwjgl:3.2.2'
@@ -375,7 +387,8 @@ def sharedFmlonlyForge = { Project prj ->
                 environment 'MOD_CLASSES', '{source_roots}'
                 environment 'MCP_MAPPINGS', '{mcp_mappings}'
 
-                property 'nativesDirectory', '{natives}'
+                // Natives are loaded from the classpath now in all cases
+                // property 'nativesDirectory', '{natives}'
                 if (prj.name == 'forge') {
                     property 'forge.enableGameTest', 'true'
                 }
@@ -429,6 +442,8 @@ def sharedFmlonlyForge = { Project prj ->
         run.args '--fml.forgeGroup', prj.group
         run.args '--fml.mcpVersion', MCP_VERSION
 
+        run.jvmArgs '-Djava.net.preferIPv6Addresses=system'
+
         if (run.name.contains('client')) {
             run.client true
         } else {
@@ -438,7 +453,7 @@ def sharedFmlonlyForge = { Project prj ->
         // SecureJarHandler bootstrap values.
         run.property 'ignoreList', prj.configurations.moduleonly.files.collect {it.name.replaceAll(/([-_]([.\d]*\d+)|\.jar$)/, '') }.join(',') + ",client-extra,fmlcore,javafmllanguage,lowcodelanguage,mclanguage,${prj.name}-"
         // FIXME: Without this jna doesn't work at runtime. Someone figure out why please?
-        run.property 'mergeModules', 'jna-5.10.0.jar,jna-platform-5.10.0.jar,java-objc-bridge-1.0.0.jar'
+        run.property 'mergeModules', 'jna-5.10.0.jar,jna-platform-5.10.0.jar'
         if (userdevRuns.contains(run)) {
             run.property 'legacyClassPath.file', '{minecraft_classpath_file}'
             run.jvmArgs '-p', '{modules}'
@@ -449,6 +464,7 @@ def sharedFmlonlyForge = { Project prj ->
         run.jvmArgs '--add-modules', 'ALL-MODULE-PATH'
         // Additions to these JVM module args should be mirrored to server_files/args.txt and other similar blocks in the buildscript
         run.jvmArgs '--add-opens', 'java.base/java.util.jar=cpw.mods.securejarhandler'
+        run.jvmArgs '--add-opens', 'java.base/java.lang.invoke=cpw.mods.securejarhandler'
         run.jvmArgs '--add-exports', 'java.base/sun.security.util=cpw.mods.securejarhandler'
         run.jvmArgs '--add-exports', 'jdk.naming.dns/com.sun.jndi.dns=java.naming'
     }
@@ -457,7 +473,8 @@ def sharedFmlonlyForge = { Project prj ->
         run.workingDirectory prj.file('run')
 
         if (run.name.contains('client') || run.name.contains('data')) {
-            run.property 'nativesDirectory', prj.extractNatives.output.get().asFile
+            // Natives are loaded from the classpath now in all cases
+            // run.property 'nativesDirectory', prj.extractNatives.output.get().asFile
             run.args '--assetsDir', prj.downloadAssets.output
             run.args '--assetIndex', "{asset_index}"
         }
@@ -639,6 +656,7 @@ project(':fmlonly') {
                           '--add-modules', 'ALL-MODULE-PATH',
                           // Additions to these JVM module args should be mirrored to server_files/args.txt and other similar blocks in the buildscript
                           '--add-opens', 'java.base/java.util.jar=cpw.mods.securejarhandler',
+                          '--add-opens', 'java.base/java.lang.invoke=cpw.mods.securejarhandler',
                           '--add-exports', 'java.base/sun.security.util=cpw.mods.securejarhandler',
                           '--add-exports', 'jdk.naming.dns/com.sun.jndi.dns=java.naming'
                     ]
@@ -866,6 +884,10 @@ project(':forge') {
     apply plugin: 'net.minecraftforge.gradle.patcher'
     apply plugin: 'org.cadixdev.licenser'
 
+    applyPatches { 
+        level 'WARNING'
+    }
+
     sourceSets {
         main {
             java {
@@ -1059,11 +1081,39 @@ project(':forge') {
                             '--mod', 'custom_transformtype_test',
                             '--mod', 'data_pack_registries_test',
                             '--mod', 'biome_modifiers_test',
+                            '--mod', 'structure_modifiers_test',
+                            '--mod', 'custom_preset_editor_test',
                             '--output', rootProject.file('src/generated_test/resources/'),
                             '--existing', sourceSets.main.resources.srcDirs[0],
                             '--existing', sourceSets.test.resources.srcDirs[0]
                 }
             }
+
+            forge_mdk_data {
+                parent runs.forge_data
+                taskName 'forge_mdk_data'
+
+                environment 'MOD_CLASSES', 'dummy' // Needed to work around FG limitation, FG will replace this!
+
+                ideaModule "${rootProject.name}.${project.name}.test"
+
+                mods {
+                    tests { sources sourceSets.test }
+                }
+
+                afterEvaluate {
+                    // Clear forge's main datagen args
+                    args.removeAll {
+                        forgeDataArgs.contains(it instanceof File ? (it as File).absolutePath : it.toString())
+                    }
+
+                    args '--flat', '--all', '--validate',
+                            '--mod', 'mdk_datagen',
+                            '--output', rootProject.file('src/generated_mdk/resources/'),
+                            '--existing', sourceSets.main.resources.srcDirs[0],
+                            '--existing', sourceSets.test.resources.srcDirs[0]
+                }
+            }
         }
     }
 
@@ -1156,89 +1206,117 @@ project(':forge') {
         }
     }
 
-    task checkATs(type: CheckATs, dependsOn: [extractInheritance, createSrg2Mcp]) {
-        inheritance = extractInheritance.output
+    task findFinalizeSpawnTargets(type: BytecodePredicateFinder, dependsOn: ['createJoinedSRG']) {
+        jar = createJoinedSRG.output
+        output = rootProject.file('src/main/resources/coremods/finalize_spawn_targets.json')
+        predicate = {
+            parent, node, insn ->
+                'net/minecraft/world/level/BaseSpawner' != parent.name // Ignore this class as we special case it.
+                && insn.getOpcode() == Opcodes.INVOKEVIRTUAL
+                && insn.name.equals('m_6518_')
+                && insn.desc.equals('(Lnet/minecraft/world/level/ServerLevelAccessor;Lnet/minecraft/world/DifficultyInstance;Lnet/minecraft/world/entity/MobSpawnType;Lnet/minecraft/world/entity/SpawnGroupData;Lnet/minecraft/nbt/CompoundTag;)Lnet/minecraft/world/entity/SpawnGroupData;')
+        }
+    }
+
+    tasks.register('validateDeprecations', ValidateDeprecations) {
+        input = tasks.jar.archiveFile
+        mcVersion = MC_VERSION
+    }
+
+    tasks.jar.finalizedBy 'validateDeprecations'
+
+    tasks.register('checkAll') {
+        dependsOn 'checkLicenses'
+        group = 'checks'
+    }
+    tasks.register('checkAllAndFix') {
+        dependsOn 'findFinalizeSpawnTargets', 'findFieldInstanceChecks', 'checkLicenses'
+        group = 'checks'
+    }
+
+    CheckTask.registerTask(tasks, 'ATs', CheckATs) {
+        dependsOn extractInheritance, createSrg2Mcp
         ats.from patcher.accessTransformers
+        inheritance = extractInheritance.output
         mappings = createSrg2Mcp.output
     }
 
-    task checkSAS(type: CheckSAS, dependsOn: extractInheritance) {
-        inheritance = extractInheritance.output
+    CheckTask.registerTask(tasks, 'SAS', CheckSAS) {
+        dependsOn extractInheritance
         sass.from patcher.sideAnnotationStrippers
+        inheritance = extractInheritance.output
     }
 
-    task checkExcs(type: CheckExcs, dependsOn: jar) {
+    CheckTask.registerTask(tasks, 'Excs', CheckExcs) {
+        dependsOn jar
         binary = jar.archiveFile.get().asFile
         excs.from patcher.excs
     }
 
-    task checkAll(dependsOn: [checkATs, checkSAS, checkExcs, findFieldInstanceChecks]){}
-
-    task checkPatchesAndFix(type: CheckPatches, dependsOn: genPatches) {
+    CheckTask.registerTask(tasks, 'Patches', CheckPatches) {
+        dependsOn genPatches
         patchDir = file("$rootDir/patches")
-        autoFix = true
-    }
-
-    task checkPatches(type: CheckPatches, dependsOn: genPatches) {
-        patchDir = file("$rootDir/patches")
-        autoFix = false
+        patchesWithS2SArtifact = [
+                'minecraft/net/minecraft/client/renderer/ViewArea.java.patch',
+                'minecraft/net/minecraft/data/models/blockstates/Variant.java.patch',
+        ]
     }
 
     genPatches {
-        finalizedBy checkPatches
+        finalizedBy checkAndFixPatches
         autoHeader true
         lineEnding = '\n'
     }
 
-    def baseForgeVersion = System.getProperty("forge.compatibility_check_version")
-    if (baseForgeVersion == null)
-        baseForgeVersion = "${MC_VERSION}-${GIT_INFO.tag}.0"
-    if (baseForgeVersion == "null")
-        baseForgeVersion = null // Allow disabling from system property if not wanted
-    def baseForgeUniversal = null
-    if (baseForgeVersion != null)
-        baseForgeUniversal = project.dependencies.create("net.minecraftforge:forge:${baseForgeVersion}:universal")
+    def baseForgeVersionProperty = project.objects.property(String)
+    baseForgeVersionProperty.set(project.provider { TeamcityRequests.attemptFindBase(rootDir) ?: getLatestForgeVersion(MC_VERSION) })
+    baseForgeVersionProperty.finalizeValueOnRead()
     def jarCompatibilityTaskSetup = { task ->
         task.group = 'jar compatibility'
         task.onlyIf {
-            baseForgeVersion != null
+            baseForgeVersionProperty.getOrNull() != null
         }
-        task.inputs.property 'baseForgeVersion', baseForgeVersion
     }
 
-    task downloadBaseCompatibilityBinPatches(type: DownloadBaseCompatibilityBinPatches) {
-        inputVersion = baseForgeVersion
+    tasks.register('setupCheckJarCompatibility', SetupCheckJarCompatibility) {
+        inputVersion = baseForgeVersionProperty
     }
 
-    task applyBaseCompatibilityJarBinPatches(type: ApplyBinPatches) {
+    tasks.register('applyBaseCompatibilityJarBinPatches', ApplyBinPatches) {
         jarCompatibilityTaskSetup(it)
 
-        clean = createJoinedSRG.output
-        patch = downloadBaseCompatibilityBinPatches.output
+        clean = project.tasks.createJoinedSRG.output
+        patch = project.tasks.named('setupCheckJarCompatibility').flatMap { it.baseBinPatchesOutput }
         output = project.layout.buildDirectory.dir(name).map { it.file('output.jar') }
     }
 
-    task checkJarCompatibility(type: CheckJarCompatibility) {
+    tasks.register('mergeBaseForgeJar', MergeJars) {
         jarCompatibilityTaskSetup(it)
 
-        if (baseForgeVersion != null) {
-            def fmlLibs = project.configurations.detachedConfiguration(PACKED_DEPS.collect {
-                def artifactId = it.split(':')[1]
-                return project.dependencies.create("net.minecraftforge:${artifactId}:${baseForgeVersion}")
-            }.toArray(Dependency[]::new))
+        inputJars.from(project.tasks.named('applyBaseCompatibilityJarBinPatches').flatMap { it.output })
+        inputJars.from(baseForgeVersionProperty.map { inputVersion ->
+            def output = project.layout.buildDirectory.dir(name).map { it.file("forge-${inputVersion}-universal.jar") }.get().asFile
+            project.rootProject.extensions.download.run {
+                src "https://maven.minecraftforge.net/net/minecraftforge/forge/${inputVersion}/forge-${inputVersion}-universal.jar"
+                dest output
+            }
+            return output
+        })
+    }
 
-            baseJar = project.tasks.applyBaseCompatibilityJarBinPatches.output
-            baseLibraries.from(baseForgeUniversal)
-            baseLibraries.from(project.tasks.createJoinedSRG.output)
-            baseLibraries.from(fmlLibs)
+    tasks.register('checkJarCompatibility', CheckJarCompatibility) {
+        jarCompatibilityTaskSetup(it)
+        dependsOn 'setupCheckJarCompatibility'
 
-            inputJar = project.tasks.reobfJar.output
-            concreteLibraries.from(PACKED_DEPS.collect { rootProject.tasks.getByPath(it).archiveFile })
+        baseJar = project.tasks.named('mergeBaseForgeJar').flatMap { it.output }
+        baseLibraries.from(project.tasks.named('createJoinedSRG').flatMap { it.output })
 
-            commonLibraries.from(project.configurations.minecraftImplementation)
-            commonLibraries.from(project.configurations.installer)
-            commonLibraries.from(project.configurations.moduleonly)
-        }
+        inputJar = project.tasks.named('reobfJar').flatMap { it.output }
+        concreteLibraries.from(project.PACKED_DEPS.collect { project.rootProject.tasks.getByPath(it).archiveFile })
+
+        commonLibraries.from(project.configurations.minecraftImplementation)
+        commonLibraries.from(project.configurations.installer)
+        commonLibraries.from(project.configurations.moduleonly)
     }
 
     task launcherJson(type: LauncherJson) {
@@ -1260,13 +1338,15 @@ project(':forge') {
                            '--fml.mcVersion', MC_VERSION,
                            '--fml.forgeGroup', project.group,
                            '--fml.mcpVersion', MCP_VERSION],
-                    jvm: ["-DignoreList=${forge_client.properties.ignoreList},\${version_name}.jar",
+                    jvm: ['-Djava.net.preferIPv6Addresses=system',
+                          "-DignoreList=${forge_client.properties.ignoreList},\${version_name}.jar",
                           "-DmergeModules=${forge_client.properties.mergeModules}",
                           '-DlibraryDirectory=${library_directory}',
                           '-p', Util.getArtifacts(project, configurations.moduleonly, false).values().collect{'${library_directory}/' + it.downloads.artifact.path}.join('${classpath_separator}'),
                           '--add-modules', 'ALL-MODULE-PATH',
                           // Additions to these JVM module args should be mirrored to server_files/args.txt and other similar blocks in the buildscript
                           '--add-opens', 'java.base/java.util.jar=cpw.mods.securejarhandler',
+                          '--add-opens', 'java.base/java.lang.invoke=cpw.mods.securejarhandler',
                           '--add-exports', 'java.base/sun.security.util=cpw.mods.securejarhandler',
                           '--add-exports', 'jdk.naming.dns/com.sun.jndi.dns=java.naming'
                     ]
@@ -1550,11 +1630,15 @@ project(':forge') {
                 MAPPING_CHANNEL: MAPPING_CHANNEL,
                 MAPPING_VERSION: MAPPING_VERSION,
                 FORGE_SPEC_VERSION: SPEC_VERSION.split("\\.")[0],
-                MC_NEXT_VERSION: "1."+((MC_VERSION.split("[\\.-]")[1] as int)+1)
+                MC_NEXT_VERSION: MC_NEXT_VERSION
             ])
             rename 'gitignore\\.txt', '.gitignore'
             rename 'gitattributes\\.txt', '.gitattributes'
         }
+        from(rootProject.file('src/generated_mdk/resources/')) {
+            into('src/main/resources/')
+            exclude '**/.cache/'
+        }
     }
 
     license {
@@ -1706,4 +1790,4 @@ if (System.env.TEAMCITY_VERSION) {
             println "##teamcity[setParameter name='env.PUBLISHED_JAVA_FML_ARTIFACT_VERSION' value='${project(':fmlonly').version}']"
         }
     }
-}
+}

buildSrc/build.gradle

@@ -4,7 +4,10 @@ repositories {
 }
 
 dependencies {
-	implementation 'org.ow2.asm:asm:9.3'
-	implementation 'org.ow2.asm:asm-tree:9.3'
-    implementation 'net.minecraftforge:srgutils:0.4.+'
+    implementation 'org.ow2.asm:asm:9.5'
+    implementation 'org.ow2.asm:asm-tree:9.5'
+    implementation 'net.minecraftforge:srgutils:0.5.+'
+    implementation 'commons-io:commons-io:2.8.0'
+    implementation 'com.google.code.gson:gson:2.10'
+    implementation 'org.eclipse.jgit:org.eclipse.jgit:6.5.0.202303070854-r'
 }

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/BytecodeFinder.groovy

@@ -6,15 +6,10 @@ import org.gradle.api.file.RegularFileProperty
 import org.gradle.api.tasks.InputFile
 import org.gradle.api.tasks.OutputFile
 import org.gradle.api.tasks.TaskAction
-import org.objectweb.asm.ClassReader
-import org.objectweb.asm.Opcodes
 import org.objectweb.asm.tree.ClassNode
 import org.objectweb.asm.tree.FieldNode
 import org.objectweb.asm.tree.MethodNode
 
-import java.util.zip.ZipEntry
-import java.util.zip.ZipInputStream
-
 abstract class BytecodeFinder extends DefaultTask {
     @InputFile abstract RegularFileProperty getJar()
     @OutputFile abstract RegularFileProperty getOutput()
@@ -33,18 +28,7 @@ abstract class BytecodeFinder extends DefaultTask {
 
         pre()
 
-        jar.get().asFile.withInputStream { i ->
-            new ZipInputStream(i).withCloseable { zin ->
-                ZipEntry zein
-                while ((zein = zin.nextEntry) != null) {
-                    if (zein.name.endsWith('.class')) {
-                        def node = new ClassNode(Opcodes.ASM9)
-                        new ClassReader(zin).accept(node, 0)
-                        process(node)
-                    }
-                }
-            }
-        }
+        Util.processClassNodes(jar.get().asFile, this::process)
 
         post()
         outputFile.text = new JsonBuilder(getData()).toPrettyString()

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/BytecodePredicateFinder.groovy

@@ -0,0 +1,32 @@
+package net.minecraftforge.forge.tasks
+
+import groovy.transform.CompileStatic
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.Internal
+import org.objectweb.asm.tree.ClassNode
+import org.objectweb.asm.tree.MethodNode
+
+@CompileStatic
+abstract class BytecodePredicateFinder extends BytecodeFinder {
+
+    @Internal
+    abstract Property<Closure<Boolean>> getPredicate()
+
+    private final Set<String> matches = new HashSet()
+
+    @Override
+    protected process(ClassNode parent, MethodNode node) {
+        for (final current : node.instructions) {
+            if (predicate.get().call(parent, node, current)) {
+                matches.add(parent.name)
+                return
+            }
+        }
+    }
+
+    @Internal
+    @Override
+    protected Object getData() {
+        return matches.toSorted(Comparator.naturalOrder()) ?: {throw new RuntimeException('Failed to find any targets, please ensure that method names and descriptors are correct.')}()
+    }
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/CheckATs.groovy

@@ -1,267 +0,0 @@
-package net.minecraftforge.forge.tasks
-
-import net.minecraftforge.srgutils.IMappingFile
-import org.gradle.api.file.ConfigurableFileCollection
-import org.gradle.api.file.RegularFileProperty
-
-import org.gradle.api.DefaultTask
-import org.gradle.api.tasks.InputFile
-import org.gradle.api.tasks.InputFiles
-import org.gradle.api.tasks.Optional
-import org.gradle.api.tasks.TaskAction
-import org.objectweb.asm.Opcodes
-
-abstract class CheckATs extends DefaultTask {
-	@InputFile abstract RegularFileProperty getInheritance()
-	@InputFiles abstract ConfigurableFileCollection getAts()
-    @InputFile @Optional abstract RegularFileProperty getMappings()
-	
-    @TaskAction
-    protected void exec() {
-        def mappings = mappings.map { IMappingFile.load(it.asFile) }.getOrNull()
-		Util.init()
-		def parse = { line ->
-			def idx = line.indexOf('#')
-			def comment = idx == -1 ? null : line.substring(idx)
-			if (idx != -1) line = line.substring(0, idx - 1)
-			def (modifier, cls, desc) = (line.trim() + '     ').split(' ', -1)
-			def key = cls + (desc.isEmpty() ? '' : ' ' + desc)
-			return [modifier, cls, desc, comment, key]
-		}
-		def accessLevel = { access ->
-			if ((access & Opcodes.ACC_PUBLIC)    != 0) return 3
-			if ((access & Opcodes.ACC_PROTECTED) != 0) return 2
-			if ((access & Opcodes.ACC_PRIVATE)   != 0) return 0
-			return 1
-		}
-		def accessStr = { access ->
-			if (access.endsWith('-f') || access.endsWith('+f'))
-				return 4
-			switch (access.toLowerCase()) {
-				case 'public':    return 3
-				case 'protected': return 2
-				case 'default':   return 1
-				case 'private':   return 0
-				default:          return -1
-			}
-		}
-		def json = inheritance.get().asFile.json()
-		
-		ats.each { f -> 
-			TreeMap lines = [:]
-			def group = null
-			for (def line : f.readLines()) {
-				if (line.isEmpty()) continue
-				if (line.startsWith('#group ')) {
-					def (modifier, cls, desc, comment, key) = parse.call(line.substring(7))
-					
-					if (desc != '*' && desc != '*()' && desc != '<init>')
-						throw new IllegalStateException('Invalid group: ' + line)
-					
-					group = [modifier: modifier, cls: cls, desc: desc, comment: comment, 
-						existing: [] as Set,
-						children: [] as TreeSet,
-						group: true
-					]
-					if (lines.containsKey(key))
-						throw new IllegalStateException('Duplicate group: ' + line)
-					
-					lines[key] = group
-				} else if (group != null) {
-					if (line.startsWith('#endgroup')) {
-						group = null
-					} else {
-						def (modifier, cls, desc, comment, key) = parse.call(line)
-						group['existing'].add(key)
-					}
-				} else if (line.startsWith('#endgroup')) {
-					throw new IllegalStateException('Invalid group ending: ' + line)
-				} else if (line.startsWith('#')) {
-					//Nom
-				} else {
-					def (modifier, cls, desc, comment, key) = parse.call(line)
-					if (lines.containsKey(key)) {
-						println('Duplicate: ' + line)
-						continue
-					}
-					lines[key] = [modifier: modifier, cls: cls, desc: desc, comment: comment, group: false]
-				}
-			}
-			
-			// Process Groups, this will remove any entries outside the group that is covered by the group
-			for (def key : new ArrayList<>(lines.keySet())) {
-				def entry = lines.get(key)
-				if (entry != null && entry['group']) {
-					def cls = entry['cls']
-					def jcls = json.get(cls.replaceAll('\\.', '/'))
-					if (jcls == null) {
-						lines.remove(key)
-						println('Invalid Group: ' + key)
-					} else if ('*' == entry['desc']) {
-						if (!jcls.containsKey('fields')) {
-							lines.remove(key)
-							println('Invalid Group, Class has no fields: ' + key)
-						} else {
-							jcls['fields'].each { field, value ->
-								def fkey = cls + ' ' + field
-								if (accessLevel.call(value['access']) < accessStr.call(entry['modifier'])) {
-									if (lines.containsKey(fkey)) {
-										lines.remove(fkey)
-									} else if (!entry['existing'].contains(fkey)) {
-										println('Added: ' + fkey)
-									}
-									entry['children'].add(fkey)
-								} else if (lines.containsKey(fkey)) {
-									lines.remove(fkey)
-									println('Removed: ' + fkey)
-								}
-							}
-							entry['existing'].stream().findAll{ !entry['children'].contains(it) }.each{ println('Removed: ' + it) }
-						}
-					} else if ('*()' == entry['desc']) {
-						if (!jcls.containsKey('methods')) {
-							lines.remove(key)
-							println('Invalid Group, Class has no methods: ' + key)
-						} else {
-							jcls['methods'].each{ mtd, value ->
-								if (mtd.startsWith('<clinit>') || mtd.startsWith('lambda$'))
-									return
-								key = cls + ' ' + mtd.replace(' ', '')
-								if (accessLevel.call(value['access']) < accessStr.call(entry['modifier'])) {
-									if (lines.containsKey(key)) {
-										lines.remove(key)
-									} else if (!entry['existing'].contains(key)) {
-										println('Added: ' + key)
-									}
-									entry['children'].add(key)
-								} else if (lines.containsKey(key)) {
-									lines.remove(key)
-									println('Removed: ' + key)
-								}
-							}
-							entry['existing'].stream().findAll{ !entry['children'].contains(it) }.each{ println('Removed: ' + it) }
-						}
-					} else if ('<init>' == entry['desc']) { //Make all public non-abstract subclasses
-						json.each{ tcls,value -> 
-							if (!value.containsKey('methods') || ((value['access'] & Opcodes.ACC_ABSTRACT) != 0))
-								return
-							def parents = [] as Set
-							def parent = tcls
-							while (parent != null && json.containsKey(parent)) {
-								parents.add(parent)
-								def p = json[parent]
-								parent = p == null ? null : p['superName']
-							}
-							if (parents.contains(cls.replaceAll('\\.', '/'))) {
-								value['methods'].each{ mtd, v -> 
-									if (mtd.startsWith('<init>')) {
-										def child = tcls.replaceAll('/', '\\.') + ' ' + mtd.replace(' ', '')
-										if (accessLevel.call(v['access']) < 3) {
-											if (lines.containsKey(child)) {
-												lines.remove(child)
-											} else if (!entry['existing'].contains(child)) {
-												println('Added: ' + child)
-											}
-											entry['children'].add(child)
-										} else if (lines.containsKey(child)) {
-											lines.remove(child)
-											println('Removed: ' + child)
-										}
-									}
-								}
-							}
-						}
-						entry['existing'].stream().findAll{ !entry['children'].contains(it) }.each{ println('Removed: ' + it) }
-					}
-				}
-			}
-			
-			// Process normal lines, remove invalid and remove narrowing
-			for (def key : new ArrayList<>(lines.keySet())) {
-				def entry = lines.get(key)
-				if (entry != null && !entry['group']) {
-					def cls = entry['cls']
-					def jcls = json.get(cls.replaceAll('\\.', '/'))
-					if (jcls == null) {
-						lines.remove(key)
-						println('Invalid: ' + key)
-					} else if (entry['desc'] == '') {
-						if (accessLevel.call(jcls['access']) > accessStr.call(entry['modifier']) && (entry.comment == null || !entry.comment.startsWith('#force '))) {
-							lines.remove(key)
-							println('Invalid Narrowing: ' + key)
-						}
-					} else if (!entry['desc'].contains('(')) {
-						if (!jcls.containsKey('fields') || !jcls['fields'].containsKey(entry['desc'])) {
-							lines.remove(key)
-							println('Invalid: ' + key)
-						} else {
-							def value = jcls['fields'][entry['desc']]
-							if (accessLevel.call(value['access']) > accessStr.call(entry['modifier']) && (entry.comment == null || !entry.comment.startsWith('#force '))) {
-								lines.remove(key)
-								println('Invalid Narrowing: ' + key)
-								println(entry.comment)
-							}
-						}
-					} else {
-						def jdesc = entry['desc'].replace('(', ' (')
-						if (!jcls.containsKey('methods') || !jcls['methods'].containsKey(jdesc)) {
-							lines.remove(key)
-							println('Invalid: ' + key)
-						} else {
-							def value = jcls['methods'][jdesc]
-							if (accessLevel.call(value['access']) > accessStr.call(entry['modifier']) && (entry.comment == null || !entry.comment.startsWith('#force '))) {
-								lines.remove(key)
-								println('Invalid Narrowing: ' + key)
-							}
-						}
-					}
-				}
-			}
-
-			
-			def data = []
-            def remapComment = { entry ->
-                if (!mappings || !entry || !entry.desc) return null
-                def comment = entry.comment?.substring(1)?.trim()
-                def jsonCls = json.get(entry.cls.replaceAll('\\.', '/'))
-                def mappingsClass = mappings?.getClass(jsonCls.name)
-                if (!mappingsClass) return entry.comment
-                def idx = entry.desc.indexOf('(')
-                def mappedName = idx == -1
-                        ? mappingsClass.remapField(entry.desc)
-                        : mappingsClass.remapMethod(entry.desc.substring(0, idx), entry.desc.substring(idx))
-                if (!mappedName) return entry.comment
-                if (mappedName == '<init>')
-                    mappedName = 'constructor'
-
-                if (comment?.startsWith(mappedName))
-                    return '# ' + comment
-                if (comment && comment.indexOf(' ') != -1) {
-                    def split = comment.split(" - ").toList()
-                    if (split[0].indexOf(' ') != -1)
-                        // The first string is more than one word, so append before it
-                        return "# ${mappedName} - ${comment}"
-                    split.remove(0)
-                    return "# ${mappedName} - ${String.join(' - ', split)}"
-                }
-                return '# ' + mappedName
-            }
-			lines.each { key,value -> 
-				if (!value.group) {
-                    def comment = remapComment.call(value)
-					data.add(value.modifier + ' ' + key + (comment ? ' ' + comment : ''))
-				} else {
-					data.add('#group ' + value.modifier + ' ' + key + (value.comment == null ? '' : ' ' + value.comment))
-					value.children.each {
-                        def line = value.modifier + ' ' + it
-                        def (modifier, cls, desc, comment) = parse.call(line)
-                        comment = remapComment.call([modifier: modifier, cls: cls, desc: desc, comment: comment])
-                        data.add(line + (comment ? ' ' + comment : ''))
-                    }
-					data.add('#endgroup')
-				}
-			}
-			f.text = data.join('\n')
-		}
-	}
-}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/CheckExcs.groovy

@@ -1,94 +0,0 @@
-package net.minecraftforge.forge.tasks
-
-import org.gradle.api.file.ConfigurableFileCollection
-import org.gradle.api.file.RegularFileProperty
-
-import org.gradle.api.DefaultTask
-import org.gradle.api.tasks.InputFile
-import org.gradle.api.tasks.InputFiles
-import org.gradle.api.tasks.TaskAction
-
-import org.objectweb.asm.ClassReader
-import org.objectweb.asm.ClassVisitor
-import org.objectweb.asm.MethodVisitor
-import org.objectweb.asm.Opcodes
-import org.objectweb.asm.Type
-
-import java.util.zip.ZipEntry
-import java.util.zip.ZipInputStream
-
-abstract class CheckExcs extends DefaultTask {
-	@InputFile abstract RegularFileProperty getBinary()
-	@InputFiles abstract ConfigurableFileCollection getExcs()
-	
-    @TaskAction
-    protected void exec() {
-		Util.init()
-		def known = []
-		binary.get().asFile.withInputStream { i ->
-			new ZipInputStream(i).withCloseable { zin ->
-				def visitor = new ClassVisitor(Opcodes.ASM9) {
-					private String cls
-					@Override
-					public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
-						this.cls = name
-					}
-					
-					@Override
-					public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
-						known.add(this.cls + '.' + name + descriptor)
-						super.visitMethod(access, name, descriptor, signature, exceptions)
-					}
-				}
-				ZipEntry zein
-				while ((zein = zin.nextEntry) != null) {
-					if (zein.name.endsWith('.class')) {
-						ClassReader reader = new ClassReader(zin)
-						reader.accept(visitor, ClassReader.SKIP_CODE | ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES)
-					}
-				}
-			}
-		}
-		
-		excs.each { f -> 
-			def lines = []
-			f.eachLine { line ->
-				def idx = line.indexOf('#')
-				if (idx == 0 || line.isEmpty()) {
-					return
-				}
-				
-				def comment = idx == -1 ? null : line.substring(idx)
-				if (idx != -1) line = line.substring(0, idx - 1)
-				
-				if (!line.contains('=')) {
-					println('Invalid: ' + line)
-					return
-				}
-				
-				def (key, value) = line.split('=', 2)
-				if (!known.contains(key)) {
-					println('Unknown: ' + line)
-					return
-				}
-				
-				def (cls, desc) = key.split('\\.', 2)
-				if (!desc.contains('(')) {
-					println('Invalid: ' + line)
-					return
-				}
-				def name = desc.split('\\(', 2)[0]
-				desc = '(' + desc.split('\\(', 2)[1]
-				
-				def (exceptions, args) = value.contains('|') ? value.split('|', 2) : [value, '']
-				
-				if (args.split(',').length != Type.getArgumentTypes(desc).length) {
-					println('Invalid: ' + line)
-					return
-				}
-				lines.add(line)
-			}
-			f.text = lines.sort().join('\n')
-		}
-	}
-}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/CheckPatches.groovy

@@ -1,219 +0,0 @@
-package net.minecraftforge.forge.tasks
-
-import org.gradle.api.DefaultTask
-import org.gradle.api.file.DirectoryProperty
-import org.gradle.api.tasks.Input
-import org.gradle.api.tasks.InputDirectory
-import org.gradle.api.tasks.TaskAction
-
-import java.nio.file.Files
-import java.nio.file.Paths
-import java.util.regex.Pattern
-
-abstract class CheckPatches extends DefaultTask {
-    @InputDirectory abstract DirectoryProperty getPatchDir()
-    @Input boolean autoFix = false
-
-    @TaskAction
-    protected void exec() {
-        def hasS2SArtifact = [
-                Paths.get("patches/minecraft/net/minecraft/client/renderer/ViewArea.java.patch"),
-                Paths.get("patches/minecraft/net/minecraft/data/models/blockstates/Variant.java.patch")
-        ]
-
-        def verified = true;
-        patchDir.get().asFileTree.each { patch ->
-            def patchPath = project.rootDir.toPath().relativize(patch.toPath())
-            verified &= verifyPatch(patch, autoFix, patchPath.toString(), hasS2SArtifact.contains(patchPath))
-        }
-
-        if (!verified)
-            throw new RuntimeException('One or more patches failed verification. Check the log for errors.')
-    }
-
-    def verifyPatch(patch, fix, patchPath, hasS2SArtifact) {
-        def hunk_start_pattern = Pattern.compile('^@@ -[0-9,]* \\+[0-9,_]* @@$')
-        def white_space_pattern = Pattern.compile('^[+\\-]\\s*$')
-        def import_pattern = Pattern.compile('^[+\\-]\\s*import.*')
-        def field_pattern = Pattern.compile('^[+\\-][\\s]*((public|protected|private)[\\s]*)?(static[\\s]*)?(final)?([^=;]*)(=.*)?;\\s*$')
-        def method_pattern = Pattern.compile('^[+\\-][\\s]*((public|protected|private)[\\s]*)?(static[\\s]*)?(final)?([^(]*)[(]([^)]*)?[)]\\s*[{]\\s*$')
-        def class_pattern = Pattern.compile('^[+\\-][\\s]*((public|protected|private)[\\s]*)?(static[\\s]*)?(final[\\s]*)?(class|interface)([^{]*)[{]\\s*$')
-
-        def accessMap = [("private"):0, (null):1, ("protected"):2, ("public"):3]
-
-        def hasProblem = false;
-        def lines = patch.readLines()
-
-        def hunksStart = 0
-        def onlyWhiteSpace = false
-
-        def didFix = false
-        def newLines = []
-        def whiteSpaceErrors = []
-
-        // First two lines are file name ++/-- and we do not care
-        newLines.add(lines[0] + '\n')
-        newLines.add(lines[1] + '\n')
-
-        int i = 2
-        for (; i < lines.size(); ++i) {
-            def line = lines[i]
-            newLines.add(line + '\n')
-
-            if (hunk_start_pattern.matcher(line).find()) {
-                if (onlyWhiteSpace) {
-                    if (fix || hasS2SArtifact) {
-                        logger.lifecycle("Removing white space hunk starting at line {}, file: {}", hunksStart + 1, patchPath)
-                        def toRemove = i - hunksStart;
-                        while (toRemove-- > 0)
-                            newLines.remove(newLines.size() - 1)
-                        didFix = true
-                    }
-                    else {
-                        logger.lifecycle("Patch contains only white space hunk starting at line {}, file: {}", hunksStart + 1, patchPath)
-                        hasProblem = true
-                    }
-                }
-                else {
-                    if (!whiteSpaceErrors.empty)
-                        hasProblem = true
-                    whiteSpaceErrors.each { error -> logger.lifecycle(error) }
-                    whiteSpaceErrors.clear()
-                }
-                hunksStart = i
-                onlyWhiteSpace = true
-                continue
-            }
-
-            if (line.startsWithAny('+','-')) {
-                def prefixChange = false
-                def prevLine = lines[i - 1]
-
-                if (line.charAt(0) == (char)'+' && prevLine.charAt(0) == (char)'-') {
-                    def prevTrim = prevLine.substring(1).replaceAll("\\s", "")
-                    def currTrim = line.substring(1).replaceAll("\\s", "")
-
-                    if (prevTrim.equals(currTrim)) {
-                        prefixChange = true
-                    }
-
-                    def pMatcher = field_pattern.matcher(prevLine)
-                    def cMatcher = field_pattern.matcher(line)
-
-                    if (pMatcher.find() && cMatcher.find() &&
-                            pMatcher.group(6) == cMatcher.group(6) && // = ...
-                            pMatcher.group(5) == cMatcher.group(5) && // field name
-                            pMatcher.group(3) == cMatcher.group(3) && // static
-                            (accessMap[pMatcher.group(2)] < accessMap[cMatcher.group(2)] || pMatcher.group(4) != cMatcher.group(4))) {
-                        logger.lifecycle("Patch contains access changes or final removal at line {}, file: {}", i + 1, patchPath)
-                        hasProblem = true
-                    }
-
-                    pMatcher = method_pattern.matcher(prevLine)
-                    cMatcher = method_pattern.matcher(line)
-
-                    if (pMatcher.find() && cMatcher.find() &&
-                            pMatcher.group(6) == cMatcher.group(6) && // params
-                            pMatcher.group(5) == cMatcher.group(5) && // <T> void name
-                            pMatcher.group(3) == cMatcher.group(3) && // static
-                            (accessMap[pMatcher.group(2)] < accessMap[cMatcher.group(2)] || pMatcher.group(4) != cMatcher.group(4))) {
-                        logger.lifecycle("Patch contains access changes or final removal at line {}, file: {}", i + 1, patchPath)
-                        hasProblem = true
-                    }
-
-                    pMatcher = class_pattern.matcher(prevLine)
-                    cMatcher = class_pattern.matcher(line)
-
-                    if (pMatcher.find() && cMatcher.find() &&
-                            pMatcher.group(6) == cMatcher.group(6) && // ClassName<> extends ...
-                            pMatcher.group(5) == cMatcher.group(5) && // class | interface
-                            pMatcher.group(3) == cMatcher.group(3) && // static
-                            (accessMap[pMatcher.group(2)] < accessMap[cMatcher.group(2)] || pMatcher.group(4) != cMatcher.group(4))) {
-                        logger.lifecycle("Patch contains access changes or final removal at line {}, file: {}", i + 1, patchPath)
-                        hasProblem = true
-                    }
-                }
-
-                if (line.charAt(0) == (char)'-' && i + 1 < lines.size()) {
-                    def nextLine = lines[i + 1]
-                    if (nextLine.charAt(0) == (char)'+') {
-                        def nextTrim = nextLine.substring(1).replaceAll("\\s", "")
-                        def currTrim = line.substring(1).replaceAll("\\s", "")
-
-                        if (nextTrim.equals(currTrim)) {
-                            prefixChange = true
-                        }
-                    }
-                }
-
-                def isWhiteSpaceChange = white_space_pattern.matcher(line).find()
-
-                if (!prefixChange && !isWhiteSpaceChange) {
-                    onlyWhiteSpace = hasS2SArtifact && import_pattern.matcher(line).find()
-                }
-                else if (isWhiteSpaceChange) {
-                    def prevLineChange = prevLine.startsWithAny('+','-')
-                    def nextLineChange = i + 1 < lines.size() && lines[i + 1].startsWithAny('+','-')
-
-                    if (!prevLineChange && !nextLineChange) {
-                        whiteSpaceErrors.add(String.format("Patch contains white space change in valid hunk at line %d (cannot auto fix), file: %s", i + 1, patchPath))
-                    }
-                }
-
-                if (line.contains("\t")) {
-                    if (!fix) {
-                        logger.lifecycle("Patch contains tabs on line {}, file: {}", i + 1, patchPath)
-                        hasProblem = true
-                    }
-                    else {
-                        logger.lifecycle("Fixing tabs on line {}, file: {}", i + 1, patchPath)
-                        line = line.replaceAll('\t', '    ')
-                        newLines.remove(newLines.size() - 1)
-                        newLines.add(line + '\n')
-                        didFix = true
-                    }
-                }
-
-                if (import_pattern.matcher(line).find() && !hasS2SArtifact) {
-                    logger.lifecycle("Patch contains import change on line {}, file: {}", i + 1, patchPath)
-                    hasProblem = true
-                }
-            }
-        }
-
-        if (onlyWhiteSpace) {
-            if (fix || hasS2SArtifact) {
-                logger.lifecycle("Removing white space hunk starting at line {}, file: {}", hunksStart + 1, patchPath)
-                def toRemove = i - hunksStart;
-                while (toRemove-- > 0)
-                    newLines.remove(newLines.size() - 1)
-                didFix = true
-            }
-            else {
-                logger.lifecycle("Patch contains only white space hunk starting at line {}, file: {}", hunksStart + 1, patchPath)
-                hasProblem = true
-            }
-        }
-        else {
-            if (!whiteSpaceErrors.empty)
-                hasProblem = true
-            whiteSpaceErrors.each { error -> logger.lifecycle(error) }
-        }
-
-        if (didFix) {
-            if (newLines.size() <= 2) {
-                logger.lifecycle("Patch is now empty removing, file: {}", patchPath)
-                Files.delete(patch.toPath())
-            }
-            else {
-                if (!hasS2SArtifact)
-                    logger.lifecycle("*** Updating patch file. Please run setup then genPatches again. ***")
-                patch.withWriter('UTF-8') { writer ->
-                    newLines.each { l -> writer.write(l) }
-                }
-            }
-        }
-
-        return !hasProblem
-    }
-}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/CheckSAS.groovy

@@ -1,107 +0,0 @@
-package net.minecraftforge.forge.tasks
-
-import org.gradle.api.file.ConfigurableFileCollection
-import org.gradle.api.file.RegularFileProperty
-
-import org.gradle.api.DefaultTask
-import org.gradle.api.tasks.InputFile
-import org.gradle.api.tasks.InputFiles
-import org.gradle.api.tasks.TaskAction
-
-abstract class CheckSAS extends DefaultTask {
-	@InputFile abstract RegularFileProperty getInheritance()
-	@InputFiles abstract ConfigurableFileCollection getSass()
-	
-    @TaskAction
-    protected void exec() {
-		Util.init()
-		def json = inheritance.get().asFile.json()
-		
-		sass.each { f -> 
-			def lines = []
-			f.eachLine { line ->
-				if (line[0] == '\t') return //Skip any tabbed lines, those are ones we add
-				def idx = line.indexOf('#')
-				if (idx == 0 || line.isEmpty()) {
-					lines.add(line)
-					return
-				}
-				def comment = idx == -1 ? null : line.substring(idx)
-				if (idx != -1) line = line.substring(0, idx - 1)
-				def (cls, name, desc) = (line.trim().replace('(', ' (') + '     ').split(' ', -1)
-				cls = cls.replaceAll('\\.', '/')
-
-				if (json[cls] == null) {
-					println('Invalid: ' + line)
-				} else if (name.isEmpty()) { //Class SAS
-                    def toAdd = []
-                    def clsSided = isSided(json[cls])
-                    def sided = clsSided
-                    
-                    /* TODO: MergeTool doesn't do fields
-                    if (json[cls]['fields'] != null) {
-						for (entry in json[cls]['fields']) {
-                            if (isSided(entry.value)) {
-                                sided = true
-                                toAdd.add('\t' + cls + ' ' + entry.key)
-                            }
-						}
-                    }
-                    */
-					if (json[cls]['methods'] != null) {
-                        for (entry in json[cls]['methods']) {
-                            if (isSided(entry.value)) {
-                                sided = true
-                                toAdd.add('\t' + cls + ' ' + entry.key.replaceAll(' ', ''))
-                                findChildMethods(json, cls, entry.key).each { lines.add('\t' + it) }
-                                findChildMethods(json, cls, entry.key).each { println(line + ' -- ' + it) }
-                            } else if (clsSided) {
-                                findChildMethods(json, cls, entry.key).each { lines.add('\t' + it) }
-                                findChildMethods(json, cls, entry.key).each { println(line + ' -- ' + it) }
-                            }
-						}
-                    }
-                    
-                    if (sided) {
-                        lines.add(cls + (comment == null ? '' : ' ' + comment))
-                        lines.addAll(toAdd.sort())
-                    } else
-                        println('Invalid: ' + line)
-                    
-                } else if (desc.isEmpty()) { // Fields
-                    /* TODO: MergeTool doesn't do fields
-                    if (json[cls]['fields'] != null && isSided(json[cls]['fields'][name]))
-                        lines.add(cls + ' ' + name + (comment == null ? '' : ' ' + comment))
-                    else
-                    */
-                        println('Invalid: ' + line)
-                } else { // Methods
-                    if (json[cls]['methods'] == null || !isSided(json[cls]['methods'][name + ' ' + desc]))
-                        println('Invalid: ' + line)
-                    else {
-                        lines.add(cls + ' ' + name + desc + (comment == null ? '' : ' ' + comment))
-                        findChildMethods(json, cls, name + ' ' + desc).each { println(line + ' -- ' + it) }
-                        findChildMethods(json, cls, name + ' ' + desc).each { lines.add('\t' + it) }
-                    }
-                }
-			}
-			f.text = lines.join('\n')
-		}
-	}
-
-    protected static isSided(json) {
-        if (json == null || json['annotations'] == null)
-            return false
-        for (ann in json['annotations']) {
-            if ('Lnet/minecraftforge/api/distmarker/OnlyIn;'.equals(ann.desc))
-                return true
-        }
-        return false
-    }
-    
-	protected static findChildMethods(json, cls, desc)
-	{
-		return json.values().findAll{ it.methods != null && it.methods[desc] != null && it.methods[desc].override == cls && isSided(it.methods[desc]) }
-				.collect { it.name + ' ' + desc.replace(' ', '') } as TreeSet
-	}
-}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/DownloadBaseCompatibilityBinPatches.groovy

@@ -1,39 +0,0 @@
-package net.minecraftforge.forge.tasks
-
-import org.gradle.api.DefaultTask
-import org.gradle.api.file.RegularFileProperty
-import org.gradle.api.provider.Property
-import org.gradle.api.tasks.Input
-import org.gradle.api.tasks.Optional
-import org.gradle.api.tasks.OutputFile
-import org.gradle.api.tasks.TaskAction
-
-import java.nio.file.Files
-
-abstract class DownloadBaseCompatibilityBinPatches extends DefaultTask {
-    DownloadBaseCompatibilityBinPatches() {
-        group = 'jar compatibility'
-        onlyIf {
-            inputVersion.getOrNull() != null
-        }
-
-        output.convention(project.layout.buildDirectory.dir(name).map { it.file('joined.lzma') })
-    }
-
-    @TaskAction
-    void run() {
-        def dep = project.dependencies.create("net.minecraftforge:forge:${inputVersion.get()}:userdev")
-        def baseForgeUserdev = project.configurations.detachedConfiguration(dep).resolve().iterator().next()
-
-        def joinedLzma = project.zipTree(baseForgeUserdev).matching { it.include('joined.lzma') }.singleFile
-
-        Files.copy(joinedLzma.toPath(), output.get().asFile.toPath())
-    }
-
-    @Input
-    @Optional
-    abstract Property<String> getInputVersion()
-
-    @OutputFile
-    abstract RegularFileProperty getOutput()
-}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/InheritanceData.groovy

@@ -0,0 +1,49 @@
+package net.minecraftforge.forge.tasks
+
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+import groovy.transform.CompileStatic
+import groovy.transform.TupleConstructor
+
+@CompileStatic
+@TupleConstructor
+final class InheritanceData implements Annotatable {
+    String name
+    int access
+    String superName
+    List<String> interfaces = []
+    Map<String, Method> methods = [:]
+    Map<String, Field> fields = [:]
+    List<Annotation> annotations = []
+
+    @TupleConstructor
+    static final class Method implements Annotatable {
+        int access
+        String override
+        List<Annotation> annotations = []
+    }
+
+    @TupleConstructor
+    static final class Field implements Annotatable {
+        int access
+        String desc
+        List<Annotation> annotations = []
+    }
+
+    @TupleConstructor
+    static final class Annotation {
+        String desc
+    }
+
+    private static final Gson GSON = new Gson()
+    static Map<String, InheritanceData> parse(File file) {
+        try (final reader = file.newReader()) {
+            return GSON.fromJson(reader, new TypeToken<Map<String, InheritanceData>>() {})
+        }
+    }
+}
+
+@CompileStatic
+interface Annotatable {
+    List<InheritanceData.Annotation> getAnnotations()
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/InstallerJar.groovy

@@ -6,7 +6,7 @@ import org.gradle.api.provider.SetProperty
 
 abstract class InstallerJar extends Zip {
     @Input @Optional abstract SetProperty<String> getPackedDependencies()
-    
+
     InstallerJar() {
         archiveClassifier.set('installer')
         archiveExtension.set('jar') // Needs to be Zip task to not override Manifest, so set extension
@@ -15,7 +15,7 @@ abstract class InstallerJar extends Zip {
         def installerJson = project.tasks.installerJson
         def launcherJson = project.tasks.launcherJson
         def downloadInstaller = project.tasks.downloadInstaller
-        
+
         dependsOn(installerJson, launcherJson, downloadInstaller)
         from(installerJson, launcherJson)
 
@@ -24,13 +24,13 @@ abstract class InstallerJar extends Zip {
             from(project.zipTree(downloadInstaller.output)) {
                 duplicatesStrategy = 'exclude'
             }
-            
-            if (!System.env.MAVEN_USER) {
+
+            if (!System.env.TEAMCITY_VERSION) {
                 dependsOn(project.universalJar)
                 from(project.universalJar) {
                     into '/maven/' + project.group.replace('.', '/') + '/' + project.universalJar.archiveBaseName.get() + '/' + project.version + '/'
                 }
-    
+
                 packedDependencies.get().forEach {
                     def jarTask = project.rootProject.getTasks().findByPath(it)
                     dependsOn(jarTask)

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/MergeJars.groovy

@@ -0,0 +1,44 @@
+package net.minecraftforge.forge.tasks
+
+import org.apache.commons.io.IOUtils
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.ConfigurableFileCollection
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.tasks.InputFiles
+import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
+
+import java.util.zip.ZipEntry
+import java.util.zip.ZipInputStream
+import java.util.zip.ZipOutputStream
+
+abstract class MergeJars extends DefaultTask {
+    MergeJars() {
+        output.convention(project.layout.buildDirectory.dir(name).map { it.file('output.jar') })
+    }
+
+    @TaskAction
+    void run() {
+        def jars = inputJars.files
+
+        try (ZipOutputStream zout = new ZipOutputStream(new FileOutputStream(output.get().asFile))) {
+            for (def jar : jars) {
+                try (ZipInputStream zin = new ZipInputStream(new FileInputStream(jar))) {
+                    def entry
+                    while ((entry = zin.getNextEntry()) != null) {
+                        ZipEntry _new = new ZipEntry(entry.getName())
+                        _new.setTime(0) //SHOULD be the same time as the main entry, but NOOOO _new.setTime(entry.getTime()) throws DateTimeException, so you get 0, screw you!
+                        zout.putNextEntry(_new)
+                        IOUtils.copy(zin, zout)
+                    }
+                }
+            }
+        }
+    }
+
+    @InputFiles
+    abstract ConfigurableFileCollection getInputJars()
+
+    @OutputFile
+    abstract RegularFileProperty getOutput()
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/SetupCheckJarCompatibility.groovy

@@ -0,0 +1,57 @@
+package net.minecraftforge.forge.tasks
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.artifacts.Dependency
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.Optional
+import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
+
+import java.nio.file.Files
+import java.nio.file.StandardCopyOption
+
+abstract class SetupCheckJarCompatibility extends DefaultTask {
+    SetupCheckJarCompatibility() {
+        group = 'jar compatibility'
+        onlyIf {
+            inputVersion.getOrNull() != null
+        }
+        outputs.upToDateWhen { false } // Never up to date, because this setup task should always run
+
+        baseBinPatchesOutput.convention(project.layout.buildDirectory.dir(name).map { it.file('joined.lzma') })
+    }
+
+    @TaskAction
+    void run() {
+        def inputVersion = inputVersion.get()
+        def fmlLibs = project.configurations.detachedConfiguration(project.PACKED_DEPS.collect {
+            def artifactId = it.split(':')[1]
+            return project.dependencies.create("net.minecraftforge:${artifactId}:${inputVersion}")
+        }.toArray(Dependency[]::new))
+
+        project.tasks.named('checkJarCompatibility') {
+            baseLibraries.from(project.provider {
+                fmlLibs.resolvedConfiguration.lenientConfiguration.files
+            })
+        }
+
+        def baseForgeUserdev = project.layout.buildDirectory.dir(name).map { it.file("forge-${inputVersion}-userdev.jar") }.get().asFile
+        project.rootProject.extensions.download.run {
+            src "https://maven.minecraftforge.net/net/minecraftforge/forge/${inputVersion}/forge-${inputVersion}-userdev.jar"
+            dest baseForgeUserdev
+        }
+
+        def joinedLzma = project.zipTree(baseForgeUserdev).matching { it.include('joined.lzma') }.singleFile
+
+        Files.copy(joinedLzma.toPath(), baseBinPatchesOutput.get().asFile.toPath(), StandardCopyOption.REPLACE_EXISTING)
+    }
+
+    @Input
+    @Optional
+    abstract Property<String> getInputVersion()
+
+    @OutputFile
+    abstract RegularFileProperty getBaseBinPatchesOutput()
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/TeamcityRequests.groovy

@@ -0,0 +1,74 @@
+package net.minecraftforge.forge.tasks
+
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+import groovy.transform.CompileStatic
+import org.eclipse.jgit.api.Git
+
+import javax.annotation.Nullable
+import java.util.stream.Collectors
+
+@CompileStatic
+class TeamcityRequests {
+    public static final Gson GSON = new Gson()
+
+    @Nullable
+    static <T> T jsonRequest(TypeToken<T> clazz, String url) throws Exception {
+        final HttpURLConnection conn = (HttpURLConnection) URI.create(url).toURL().openConnection()
+        conn.setRequestProperty('Accept', 'application/json')
+        conn.setReadTimeout(5 * 1000)
+        conn.setConnectTimeout(5 * 1000)
+        conn.connect()
+
+        if (conn.responseCode !== 200) {
+            return null
+        }
+
+        try (final InputStream is = conn.getInputStream()) {
+            GSON.fromJson(new InputStreamReader(is), clazz.getType())
+        }
+    }
+
+    @Nullable
+    static Map<String, Build> buildsByCommit() throws IOException {
+        final Map<String, Build> builds = [:]
+        jsonRequest(new TypeToken<Builds>() {}, "https://teamcity.minecraftforge.net/guestAuth/app/rest/builds?fields=build:(revisions,number)&locator=buildType:(id:MinecraftForge_MinecraftForge_MinecraftForge_MinecraftForge__Build),count:300,status:SUCCESS")
+                ?.build?.forEach {
+            it.revisions.revision.each { rev -> builds[rev.version] = it }
+        }
+        return builds
+    }
+
+    @Nullable
+    static String attemptFindBase(File gitPath) {
+        try (final git = Git.open(gitPath)) {
+            final Map<String, Build> buildByCommit = buildsByCommit()
+            for (final commit in git.log().setMaxCount(100).call()) {
+                // Find the first commit which was built on CI
+                final build = buildByCommit[commit.id.name]
+                if (build) {
+                    return build.number
+                }
+            }
+        } catch (Exception ignored) {}
+        return null
+    }
+
+    static final class Builds {
+        public List<Build> build
+    }
+
+    static final class Build {
+        public String number
+        public Revisions revisions
+    }
+
+    static final class Revisions {
+        public int count
+        public List<Revision> revision
+    }
+
+    static final class Revision {
+        public String version
+    }
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/Util.groovy

@@ -2,13 +2,20 @@ package net.minecraftforge.forge.tasks
 
 import groovy.json.JsonBuilder
 import groovy.json.JsonSlurper
+import org.objectweb.asm.ClassReader
+import org.objectweb.asm.Opcodes
+import org.objectweb.asm.tree.ClassNode
 
 import java.io.File
 import java.security.MessageDigest
 import java.text.SimpleDateFormat
 import java.util.Date
+import java.util.zip.ZipEntry
+import java.util.zip.ZipInputStream
 
 public class Util {
+    static final ASM_LEVEL = Opcodes.ASM9
+
 	static void init() {
 		File.metaClass.sha1 = { ->
 			MessageDigest md = MessageDigest.getInstance('SHA-1')
@@ -18,17 +25,17 @@ public class Util {
 			return md.digest().collect {String.format "%02x", it}.join()
 		}
         File.metaClass.getSha1 = { !delegate.exists() ? null : delegate.sha1() }
-	
+
 		File.metaClass.json = { -> new JsonSlurper().parseText(delegate.text) }
         File.metaClass.getJson = { return delegate.exists() ? new JsonSlurper().parse(delegate) : [:] }
         File.metaClass.setJson = { json -> delegate.text = new JsonBuilder(json).toPrettyString() }
-		
+
 		Date.metaClass.iso8601 = { ->
 			def format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ")
 			def result = format.format(delegate)
 			return result[0..21] + ':' + result[22..-1]
 		}
-        
+
         String.metaClass.rsplit = { String del, int limit = -1 ->
             def lst = new ArrayList()
             def x = 0, idx
@@ -41,7 +48,7 @@ public class Util {
             return lst
         }
 	}
-	
+
 	public static String[] getClasspath(project, libs, artifact) {
 		def ret = []
 		artifactTree(project, artifact).each { key, lib ->
@@ -51,7 +58,7 @@ public class Util {
 		}
 		return ret
 	}
-	
+
 	public static def getArtifacts(project, config, classifiers) {
 		def ret = [:]
 		config.resolvedConfiguration.resolvedArtifacts.each {
@@ -75,7 +82,7 @@ public class Util {
 				url = "https://maven.minecraftforge.net/${path}"
 			}
 			//TODO remove when Mojang launcher is updated
-			if (!classifiers && art.classifier != null) { 
+			if (!classifiers && art.classifier != null) {
 				//Mojang launcher doesn't currently support classifiers, so... move it to part of the version, and force the extension to 'jar'
 				// However, keep the path normal so that our mirror system works.
 				art.version = "${art.version}-${art.classifier}"
@@ -96,14 +103,14 @@ public class Util {
 		}
 		return ret
 	}
-    
-    public static def getMavenPath(task) {        
+
+    public static def getMavenPath(task) {
         def classifier = task.archiveClassifier.get()
         def dep = "${task.project.group}:${task.project.name}:${task.project.version}" + (classifier == '' ? '' : ':' + classifier)
         return "${task.project.group.replace('.', '/')}/${task.project.name}/${task.project.version}/${task.project.name}-${task.project.version}".toString() + (classifier == '' ? '' : '-' + classifier) + '.jar'
     }
-    
-    public static def getMavenDep(task) {        
+
+    public static def getMavenDep(task) {
         def classifier = task.archiveClassifier.get()
         return "${task.project.group}:${task.project.name}:${task.project.version}" + (classifier == '' ? '' : ':' + classifier)
     }
@@ -127,7 +134,7 @@ public class Util {
 		def files = cfg.resolve()
 		return getArtifacts(project, cfg, true)
 	}
-	
+
 	private static boolean checkExists(url) {
 		try {
 			def code = new URL(url).openConnection().with {
@@ -142,4 +149,25 @@ public class Util {
 			throw e
 		}
 	}
+
+    static String getLatestForgeVersion(mcVersion) {
+        final json = new JsonSlurper().parseText(new URL('https://files.minecraftforge.net/net/minecraftforge/forge/promotions_slim.json').getText('UTF-8'))
+        final ver = json.promos["$mcVersion-latest"]
+        ver === null ? null : (mcVersion + '-' + ver)
+    }
+
+    static void processClassNodes(File file, Closure process) {
+        file.withInputStream { i ->
+            new ZipInputStream(i).withCloseable { zin ->
+                ZipEntry zein
+                while ((zein = zin.nextEntry) != null) {
+                    if (zein.name.endsWith('.class')) {
+                        def node = new ClassNode(ASM_LEVEL)
+                        new ClassReader(zin).accept(node, 0)
+                        process(node)
+                    }
+                }
+            }
+        }
+    }
 }

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/ValidateDeprecations.groovy

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) Forge Development LLC and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.minecraftforge.forge.tasks
+
+import net.minecraftforge.srgutils.MinecraftVersion
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.InputFile
+import org.gradle.api.tasks.TaskAction
+import org.objectweb.asm.tree.AnnotationNode
+import org.objectweb.asm.tree.ClassNode
+
+abstract class ValidateDeprecations extends DefaultTask {
+    @InputFile
+    abstract RegularFileProperty getInput()
+
+    @Input
+    abstract Property<String> getMcVersion()
+
+    ValidateDeprecations() {
+        this.onlyIf { !System.env.TEAMCITY_VERSION }
+    }
+
+    @TaskAction
+    protected void exec() {
+        def mcVer = MinecraftVersion.from(mcVersion.get())
+        def errors = []
+
+        Util.processClassNodes(input.get().asFile) {
+            processNode(mcVer, errors, it)
+        }
+
+        if (!errors.isEmpty()) {
+            errors.forEach {
+                this.logger.error("Deprecated ${it[0]} is marked for removal in ${it[1]} but is not yet removed")
+            }
+            throw new IllegalStateException("Found deprecated members marked for removal but not yet removed in ${mcVer}; see log for details")
+        }
+    }
+
+    protected processNode(MinecraftVersion mcVer, List<String> errors, ClassNode node) {
+        node.visibleAnnotations?.each { annotation ->
+            ValidateDeprecations.processAnnotations(annotation, mcVer, errors) {
+                "class ${node.name}"
+            }
+        }
+        node.fields?.each { field ->
+            field.visibleAnnotations?.each { annotation ->
+                ValidateDeprecations.processAnnotations(annotation, mcVer, errors) {
+                    "field ${node.name}#${field.name}"
+                }
+            }
+        }
+        node.methods?.each { method ->
+            method.visibleAnnotations?.each { annotation ->
+                ValidateDeprecations.processAnnotations(annotation, mcVer, errors) {
+                    "method ${node.name}#${method.name}${method.desc}"
+                }
+            }
+        }
+    }
+
+    private static void processAnnotations(AnnotationNode annotation, MinecraftVersion mcVer, List<String> errors, Closure context) {
+        def values = annotation.values
+        if (values === null)
+            return
+        int forRemoval = values.indexOf('forRemoval')
+        int since = values.indexOf('since')
+        if (annotation.desc == 'Ljava/lang/Deprecated;' && forRemoval !== -1 && since !== -1 && values.size() >= 4 && values[forRemoval + 1] === true) {
+            def oldVersion = MinecraftVersion.from(values[since + 1])
+            def split = ValidateDeprecations.splitDots(oldVersion.toString())
+            if (split.length < 2)
+                return
+            def removeVersion = MinecraftVersion.from("${split[0]}.${split[1] + 1}")
+            if (removeVersion <= mcVer)
+                errors.add([context(), removeVersion])
+        }
+    }
+
+    private static int[] splitDots(String version) {
+        String[] pts = version.split('\\.')
+        int[] values = new int[pts.length]
+        for (int x = 0; x < pts.length; x++)
+            values[x] = Integer.parseInt(pts[x])
+        return values
+    }
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/checks/CheckATs.groovy

@@ -0,0 +1,310 @@
+package net.minecraftforge.forge.tasks.checks
+
+import groovy.transform.CompileStatic
+import groovy.transform.TupleConstructor
+import net.minecraftforge.forge.tasks.InheritanceData
+import net.minecraftforge.srgutils.IMappingFile
+import org.gradle.api.file.ConfigurableFileCollection
+import org.gradle.api.file.RegularFile
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.tasks.InputFile
+import org.gradle.api.tasks.InputFiles
+import org.gradle.api.tasks.Optional
+import org.objectweb.asm.Opcodes
+
+@CompileStatic
+abstract class CheckATs extends CheckTask {
+
+    @InputFile abstract RegularFileProperty getInheritance()
+    @InputFiles abstract ConfigurableFileCollection getAts()
+    @InputFile @Optional abstract RegularFileProperty getMappings()
+
+    @Override
+    void check(Reporter reporter, boolean fix) {
+        final IMappingFile mappings = mappings.map { RegularFile it -> IMappingFile.load(it.asFile) }.getOrNull()
+        final inheritance = InheritanceData.parse(this.inheritance.get().asFile)
+
+        ats.each {
+            final lines = process(it, reporter, inheritance)
+            if (fix) {
+                it.text = joinBack(lines, inheritance, mappings).join('\n')
+            }
+        }
+    }
+
+    private static TreeMap<String, ATParser.Entry> process(File file, Reporter reporter, Map<String, InheritanceData> inheritance) {
+        final TreeMap<String, ATParser.Entry> lines = ATParser.parse(file.readLines(), reporter)
+        final Map<String, ATParser.Entry> constructorGroups = [:]
+
+        final itr = lines.entrySet().iterator()
+        final toRemove = []
+        while (itr.hasNext()) {
+            final next = itr.next()
+            String key = next.key
+            final entry = next.value
+            if (entry === null) continue
+
+            final binaryName = entry.cls.replaceAll('\\.', '/')
+
+            // Process Groups, this will remove any entries outside the group that is covered by the group
+            if (entry.group) {
+                final jcls = inheritance[binaryName]
+                if (jcls === null) {
+                    itr.remove()
+                    reporter.report("Invalid group: $key")
+                } else if ('*' == entry.desc) {
+                    if (!jcls.fields) {
+                        itr.remove()
+                        reporter.report("Invalid group, class has no fields: $key")
+                    } else {
+                        jcls.fields.each { field, value ->
+                            final fkey = entry.cls + ' ' + field
+                            if (accessLevel(value.access) < accessStr(entry.modifier)) {
+                                if (lines.containsKey(fkey)) {
+                                    toRemove.add(fkey)
+                                } else if (!entry.existing.contains(fkey)) {
+                                    reporter.report("Missing group entry: $fkey")
+                                }
+                                entry.children.add(fkey)
+                            } else if (lines.containsKey(fkey)) {
+                                toRemove.add(fkey)
+                                reporter.report("Found invalid group entry: $fkey")
+                            }
+                        }
+                        entry.existing.findAll { it !in entry.children }.each { println('Removed: ' + it) }
+                    }
+                } else if ('*()' == entry.desc) {
+                    if (!jcls.methods) {
+                        itr.remove()
+                        reporter.report("Invalid group, class has no methods: $key")
+                    } else {
+                        jcls.methods.each { mtd, value ->
+                            if (mtd.startsWith('<clinit>') || mtd.startsWith('lambda$')) return
+                            key = entry.cls + ' ' + mtd.replace(' ', '')
+                            if (accessLevel(value.access) < accessStr(entry.modifier)) {
+                                if (lines.containsKey(key)) {
+                                    toRemove.add(key)
+                                } else if (!entry.existing.contains(key)) {
+                                    reporter.report("Missing group entry: $key")
+                                }
+                                entry.children.add(key)
+                            } else if (lines.containsKey(key)) {
+                                toRemove.add(key)
+                                reporter.report("Found invalid group entry: $key")
+                            }
+                        }
+                        entry.existing.findAll { it !in entry.children }.each { println('Removed: ' + it) }
+                    }
+                } else if ('<init>' == entry.desc) { //Make all public non-abstract subclasses
+                    constructorGroups.put(binaryName, entry)
+                }
+            }
+
+            // Process normal lines, remove invalid and remove narrowing
+            else {
+                def jcls = inheritance.get(binaryName)
+                if (jcls === null) {
+                    itr.remove()
+                    reporter.report("Invalid: $key")
+                } else if (entry.desc == '') {
+                    if (accessLevel(jcls.access) > accessStr(entry.modifier) && (entry.comment === null || !entry.comment.startsWith('#force '))) {
+                        itr.remove()
+                        reporter.report("Invalid Narrowing: $key")
+                    }
+                } else if (!entry.desc.contains('(')) {
+                    if (!jcls.fields || !jcls.fields.containsKey(entry.desc)) {
+                        itr.remove()
+                        reporter.report("Invalid: $key")
+                    } else {
+                        final value = jcls.fields[entry.desc]
+                        if (accessLevel(value.access) > accessStr(entry.modifier) && (entry.comment === null || !entry.comment.startsWith('#force '))) {
+                            itr.remove()
+                            reporter.report("Invalid Narrowing: $key - ${entry.comment}")
+                        }
+                    }
+                } else {
+                    final jdesc = entry.desc.replace('(', ' (')
+                    if (!jcls.methods || !jcls.methods.containsKey(jdesc)) {
+                        itr.remove()
+                        reporter.report("Invalid: $key")
+                    } else {
+                        final value = jcls.methods[jdesc]
+                        if (accessLevel(value.access) > accessStr(entry.modifier) && (entry.comment === null || !entry.comment.startsWith('#force '))) {
+                            itr.remove()
+                            reporter.report("Invalid Narrowing: $key")
+                        }
+                    }
+                }
+            }
+        }
+
+        inheritance.each { tcls, value ->
+            if (!value.methods || ((value.access & Opcodes.ACC_ABSTRACT) !== 0)) return
+            String parent = tcls
+            while (parent !== null) {
+                constructorGroups[parent]?.tap { entry ->
+                    value.methods.each { mtd, v ->
+                        if (mtd.startsWith('<init>')) {
+                            final child = tcls.replaceAll('/', '\\.') + ' ' + mtd.replace(' ', '')
+                            if (accessLevel(v.access) < 3) {
+                                if (lines.containsKey(child)) {
+                                    toRemove.add(child)
+                                } else if (child !in entry.existing) {
+                                    reporter.report("Missing group entry: $child")
+                                }
+                                entry.children.add(child)
+                            } else if (lines.containsKey(child)) {
+                                toRemove.add(child)
+                                reporter.report("Found invalid group entry: $child")
+                            }
+                        }
+                    }
+                }
+                parent = inheritance[parent]?.superName
+            }
+        }
+        constructorGroups.values().each { entry -> entry.existing.findAll { it !in entry.children }.each{  reporter.report("Found invalid group entry: $it") } }
+
+        toRemove.each(lines.&remove)
+
+        return lines
+    }
+
+    private static List<String> joinBack(TreeMap<String, ATParser.Entry> lines, Map<String, InheritanceData> inheritance, IMappingFile mappings) {
+        final data = []
+        final remapComment = { ATParser.Entry entry ->
+            if (!mappings || !entry || !entry.desc) return null
+            final comment = entry.comment?.substring(1)?.trim()
+            final jsonCls = inheritance.get(entry.cls.replaceAll('\\.', '/'))
+            final mappingsClass = mappings?.getClass(jsonCls.name)
+            if (mappingsClass === null) return entry.comment
+            final idx = entry.desc.indexOf('(')
+
+            String mappedName = idx == -1
+                    ? mappingsClass.remapField(entry.desc)
+                    : mappingsClass.remapMethod(entry.desc.substring(0, idx), entry.desc.substring(idx))
+            if (!mappedName) return entry.comment
+            if (mappedName == '<init>')
+                mappedName = 'constructor'
+
+            if (comment?.startsWith(mappedName))
+                return '# ' + comment
+            if (comment && comment.indexOf(' ') !== -1) {
+                def split = comment.split(' - ').toList()
+                if (split[0].indexOf(' ') !== -1)
+                // The first string is more than one word, so append before it
+                    return "# ${mappedName} - ${comment}"
+                split.remove(0)
+                return "# ${mappedName} - ${String.join(' - ', split)}"
+            }
+            return '# ' + mappedName
+        }
+        lines.each { key, value ->
+            if (!value.group) {
+                def comment = remapComment.call(value)
+                data.add(value.modifier + ' ' + key + (comment ? ' ' + comment : ''))
+            } else {
+                data.add(('#group ' + value.modifier + ' ' + key + ' ' + (value.comment ?: '')).trim())
+                value.children.each {
+                    final line = value.modifier + ' ' + it
+                    final entry = ATParser.parseEntry(line)
+                    final comment = remapComment(entry)
+                    data.add(line + (comment ? ' ' + comment : ''))
+                }
+                data.add('#endgroup')
+            }
+        }
+        return data
+    }
+
+    static int accessStr(String access) {
+        if (access.endsWith('-f') || access.endsWith('+f')) return 4
+        switch (access.toLowerCase()) {
+            case 'public':    return 3
+            case 'protected': return 2
+            case 'default':   return 1
+            case 'private':   return 0
+            default:          return -1
+        }
+    }
+
+    static int accessLevel(int access) {
+        if ((access & Opcodes.ACC_PUBLIC)    !== 0) return 3
+        if ((access & Opcodes.ACC_PROTECTED) !== 0) return 2
+        if ((access & Opcodes.ACC_PRIVATE)   !== 0) return 0
+        return 1
+    }
+}
+
+@CompileStatic
+class ATParser {
+    static TreeMap<String, Entry> parse(List<String> lines, CheckTask.Reporter reporter) {
+        TreeMap<String, Entry> outLines = new TreeMap<>()
+        Entry group = null
+        for (final line : lines) {
+            if (line.isEmpty()) continue
+            if (line.startsWith('#group ')) {
+                final entry = parseEntry(line.substring(7))
+
+                if (entry.desc != '*' && entry.desc != '*()' && entry.desc != '<init>') {
+                    reporter.report("Invalid group: $line", false)
+                }
+
+                entry.group = true
+                entry.children = []
+                entry.existing = []
+
+                group = entry
+
+                if (outLines.containsKey(entry.key)) {
+                    reporter.report("Duplicate group: $line", false)
+                }
+
+                outLines[entry.key] = group
+            } else if (group !== null) {
+                if (line.startsWith('#endgroup')) {
+                    group = null
+                } else {
+                    final key = parseEntry(line).key
+                    group.existing.add(key)
+                }
+            } else if (line.startsWith('#endgroup')) {
+                reporter.report("Invalid group ending: $line", false)
+            } else if (line.startsWith('#')) {
+                //Nom
+            } else {
+                final entry = parseEntry(line)
+                if (outLines.containsKey(entry.key)) {
+                    reporter.report("Found duplicate: $line")
+                    continue
+                }
+                outLines[entry.key] = entry
+            }
+        }
+        return outLines
+    }
+
+    static Entry parseEntry(String line) {
+        final idx = line.indexOf('#')
+        final String comment = idx === -1 ? null : line.substring(idx)
+        if (idx !== -1) line = line.substring(0, idx - 1)
+        final data = (line.trim() + '     ').split(' ', -1)
+        new Entry(data[0], data[1], data[2], comment)
+    }
+
+    @TupleConstructor
+    static final class Entry {
+        String modifier, cls, desc, comment
+
+        Set<String> existing
+        TreeSet<String> children
+        boolean group = false
+
+        @Lazy
+        String key = {cls + (desc.isEmpty() ? '' : ' ' + desc)}()
+
+        Object getAt(String key) {
+            return getProperty(key)
+        }
+    }
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/checks/CheckExcs.groovy

@@ -0,0 +1,93 @@
+package net.minecraftforge.forge.tasks.checks
+
+import net.minecraftforge.forge.tasks.Util
+import org.gradle.api.file.ConfigurableFileCollection
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.tasks.InputFile
+import org.gradle.api.tasks.InputFiles
+import org.objectweb.asm.ClassReader
+import org.objectweb.asm.ClassVisitor
+import org.objectweb.asm.MethodVisitor
+import org.objectweb.asm.Type
+
+import java.util.zip.ZipEntry
+import java.util.zip.ZipInputStream
+
+abstract class CheckExcs extends CheckTask {
+
+    @InputFile abstract RegularFileProperty getBinary()
+    @InputFiles abstract ConfigurableFileCollection getExcs()
+
+    @Override
+    void check(Reporter reporter, boolean fix) {
+        final Set<String> known = []
+        collectKnown(known)
+
+        excs.each { f ->
+            final lines = []
+            f.eachLine { line ->
+                def idx = line.indexOf('#')
+                if (idx == 0 || line.isEmpty()) {
+                    return
+                }
+
+                if (idx != -1) line = line.substring(0, idx - 1)
+
+                if (!line.contains('=')) {
+                    reporter.report("Invalid: $line")
+                    return
+                }
+
+                def (String key, String value) = line.split('=', 2)
+                if (!known.contains(key)) {
+                    reporter.report("Unknown: $line")
+                    return
+                }
+
+                String desc = key.split('\\.', 2)[1]
+                if (!desc.contains('(')) {
+                    reporter.report("Invalid: $line")
+                    return
+                }
+                desc = '(' + desc.split('\\(', 2)[1]
+
+                def (exceptions, String args) = value.contains('|') ? value.split('|', 2) : [value, '']
+
+                if (args.split(',').length !== Type.getArgumentTypes(desc).length) {
+                    reporter.report("Invalid: $line")
+                    return
+                }
+                lines.add(line)
+            }
+
+            if (fix) f.text = lines.sort().join('\n')
+        }
+    }
+
+    private void collectKnown(Collection<String> known) {
+        binary.get().asFile.withInputStream { i ->
+            new ZipInputStream(i).withCloseable { zin ->
+                final visitor = new ClassVisitor(Util.ASM_LEVEL) {
+                    private String cls
+                    @Override
+                    void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
+                        this.cls = name
+                    }
+
+                    @Override
+                    MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
+                        known.add(this.cls + '.' + name + descriptor)
+                        super.visitMethod(access, name, descriptor, signature, exceptions)
+                    }
+                }
+                ZipEntry zein
+                while ((zein = zin.nextEntry) !== null) {
+                    if (zein.name.endsWith('.class')) {
+                        ClassReader reader = new ClassReader(zin)
+                        reader.accept(visitor, ClassReader.SKIP_CODE | ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES)
+                    }
+                }
+            }
+        }
+    }
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/checks/CheckMode.groovy

@@ -0,0 +1,9 @@
+package net.minecraftforge.forge.tasks.checks
+
+import groovy.transform.CompileStatic
+
+@CompileStatic
+enum CheckMode {
+    CHECK,
+    FIX
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/checks/CheckPatches.groovy

@@ -0,0 +1,182 @@
+package net.minecraftforge.forge.tasks.checks
+
+import groovy.transform.CompileStatic
+import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.provider.ListProperty
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.InputDirectory
+import org.gradle.api.tasks.Optional
+
+import java.nio.file.Files
+import java.nio.file.Path
+import java.util.regex.Pattern
+
+@CompileStatic
+abstract class CheckPatches extends CheckTask {
+
+    private static final Pattern HUNK_START_PATTERN = Pattern.compile('^@@ -[0-9,]* \\+[0-9,_]* @@$')
+    private static final Pattern WHITESPACE_PATTERN = Pattern.compile('^[+\\-]\\s*$')
+    private static final Pattern IMPORT_PATTERN = Pattern.compile('^[+\\-]\\s*import.*')
+    private static final Pattern FIELD_PATTERN = Pattern.compile('^[+\\-][\\s]*((public|protected|private)[\\s]*)?(static[\\s]*)?(final)?([^=;]*)(=.*)?;\\s*$')
+    private static final Pattern METHOD_PATTERN = Pattern.compile('^[+\\-][\\s]*((public|protected|private)[\\s]*)?(static[\\s]*)?(final)?([^(]*)[(]([^)]*)?[)]\\s*[{]\\s*$')
+    private static final Pattern CLASS_PATTERN = Pattern.compile('^[+\\-][\\s]*((public|protected|private)[\\s]*)?(static[\\s]*)?(final[\\s]*)?(class|interface)([^{]*)[{]\\s*$')
+    private static final Map<String, Integer> ACCESS_MAP = [private: 0, protected: 2, public: 3].tap { it.put(null, 1) }
+
+    @InputDirectory abstract DirectoryProperty getPatchDir()
+    @Input @Optional abstract ListProperty<String> getPatchesWithS2SArtifact()
+
+    @Override
+    void check(Reporter reporter, boolean fix) {
+        final patchDir = getPatchDir().get().asFile.toPath()
+        Files.walk(patchDir).withCloseable {
+            it.filter(Files.&isRegularFile).forEach { path ->
+                final String relativeName = patchDir.relativize(path).toString()
+                verifyPatch(path, reporter, fix, relativeName, patchesWithS2SArtifact.get().contains(relativeName.replace('\\', '/')))
+            }
+        }
+    }
+    
+    def accessChange(previous, current) {
+        //return ACCESS_MAP[previous] < ACCESS_MAP[current]
+        return previous != current
+    }
+
+    void verifyPatch(Path patch, Reporter reporter, boolean fix, String patchPath, boolean hasS2SArtifact) {
+        final oldFixedErrors = reporter.fixed.size()
+
+        final lines = Files.readAllLines(patch)
+
+        int hunksStart = 0
+        boolean onlyWhiteSpace = false
+
+        final List<String> newLines = []
+
+        // First two lines are file name ++/-- and we do not care
+        newLines.add(lines[0] + '\n')
+        newLines.add(lines[1] + '\n')
+
+        int i
+        for (i = 2; i < lines.size(); ++i) {
+            def line = lines[i]
+            newLines.add(line + '\n')
+
+            if (HUNK_START_PATTERN.matcher(line).find()) {
+                if (onlyWhiteSpace) {
+                    if (!hasS2SArtifact)
+                        reporter.report("Patch contains only white space hunk starting at line ${hunksStart + 1}, file: $patchPath")
+                    int toRemove = i - hunksStart
+                    while (toRemove-- > 0)
+                        newLines.remove(newLines.size() - 1)
+                }
+                hunksStart = i
+                onlyWhiteSpace = true
+                continue
+            }
+
+            if (line.startsWithAny('+','-')) {
+                def prefixChange = false
+                def prevLine = lines[i - 1]
+
+                if (line.charAt(0) == (char)'+' && prevLine.charAt(0) == (char)'-') {
+                    def prevTrim = prevLine.substring(1).replaceAll("\\s", "")
+                    def currTrim = line.substring(1).replaceAll("\\s", "")
+
+                    if (prevTrim == currTrim) {
+                        prefixChange = true
+                    }
+
+                    def pMatcher = FIELD_PATTERN.matcher(prevLine)
+                    def cMatcher = FIELD_PATTERN.matcher(line)
+
+                    if (pMatcher.find() && cMatcher.find() &&
+                            pMatcher.group(6) == cMatcher.group(6) && // = ...
+                            pMatcher.group(5) == cMatcher.group(5) && // field name
+                            pMatcher.group(3) == cMatcher.group(3) && // static
+                            (accessChange(pMatcher.group(2), cMatcher.group(2)) || pMatcher.group(4) != cMatcher.group(4))) {
+                        reporter.report("Patch contains access changes or final removal at line ${i + 1}, file: $patchPath", false)
+                    }
+
+                    pMatcher = METHOD_PATTERN.matcher(prevLine)
+                    cMatcher = METHOD_PATTERN.matcher(line)
+
+                    if (pMatcher.find() && cMatcher.find() &&
+                            pMatcher.group(6) == cMatcher.group(6) && // params
+                            pMatcher.group(5) == cMatcher.group(5) && // <T> void name
+                            pMatcher.group(3) == cMatcher.group(3) && // static
+                            (accessChange(pMatcher.group(2), cMatcher.group(2)) || pMatcher.group(4) != cMatcher.group(4))) {
+                        reporter.report("Patch contains access changes or final removal at line ${i + 1}, file: $patchPath", false)
+                    }
+
+                    pMatcher = CLASS_PATTERN.matcher(prevLine)
+                    cMatcher = CLASS_PATTERN.matcher(line)
+
+                    if (pMatcher.find() && cMatcher.find() &&
+                            pMatcher.group(6) == cMatcher.group(6) && // ClassName<> extends ...
+                            pMatcher.group(5) == cMatcher.group(5) && // class | interface
+                            pMatcher.group(3) == cMatcher.group(3) && // static
+                            (accessChange(pMatcher.group(2), cMatcher.group(2)) || pMatcher.group(4) != cMatcher.group(4))) {
+                        reporter.report("Patch contains access changes or final removal at line ${i + 1}, file: $patchPath", false)
+                    }
+                }
+
+                if (line.charAt(0) == (char)'-' && i + 1 < lines.size()) {
+                    final nextLine = lines[i + 1]
+                    if (nextLine.charAt(0) == (char)'+') {
+                        final nextTrim = nextLine.substring(1).replaceAll("\\s", "")
+                        final currTrim = line.substring(1).replaceAll("\\s", "")
+
+                        if (nextTrim == currTrim) {
+                            prefixChange = true
+                        }
+                    }
+                }
+
+                final isWhiteSpaceChange = WHITESPACE_PATTERN.matcher(line).find()
+
+                if (!prefixChange && !isWhiteSpaceChange) {
+                    onlyWhiteSpace = hasS2SArtifact && IMPORT_PATTERN.matcher(line).find()
+                } else if (isWhiteSpaceChange) {
+                    final prevLineChange = prevLine.startsWithAny('+','-')
+                    final nextLineChange = i + 1 < lines.size() && lines[i + 1].startsWithAny('+','-')
+
+                    if (!prevLineChange && !nextLineChange) {
+                        reporter.report("Patch contains white space change in valid hunk at line ${i + 1}, file: $patchPath", false)
+                    }
+                }
+
+                if (line.contains('\t')) {
+                    reporter.report("Patch contains tabs on line ${i + 1}, file: $patchPath")
+                    line = line.replaceAll('\t', '    ')
+                    newLines.remove(newLines.size() - 1)
+                    newLines.add(line + '\n')
+                }
+
+                if (IMPORT_PATTERN.matcher(line).find() && !hasS2SArtifact) {
+                    reporter.report("Patch contains import change on line ${i + 1}, file: $patchPath", false)
+                }
+            }
+        }
+
+        if (onlyWhiteSpace) {
+            if (!hasS2SArtifact)
+                reporter.report("Patch contains only white space hunk starting at line ${hunksStart + 1}, file: $patchPath")
+            def toRemove = i - hunksStart;
+            while (toRemove-- > 0)
+                newLines.remove(newLines.size() - 1)
+        }
+
+        if ((reporter.fixed.size() > oldFixedErrors && fix) || hasS2SArtifact) {
+            if (newLines.size() <= 2) {
+                logger.lifecycle("Patch is now empty removing, file: {}", patchPath)
+                Files.delete(patch)
+            }
+            else {
+                if (!hasS2SArtifact)
+                    logger.lifecycle("*** Updating patch file. Please run setup then genPatches again. ***")
+                Files.newBufferedWriter(patch).withCloseable {
+                    newLines.each { l -> it.write(l) }
+                }
+            }
+        }
+    }
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/checks/CheckSAS.groovy

@@ -0,0 +1,110 @@
+package net.minecraftforge.forge.tasks.checks
+
+import groovy.transform.CompileStatic
+import net.minecraftforge.forge.tasks.Annotatable
+import net.minecraftforge.forge.tasks.InheritanceData
+import org.gradle.api.file.ConfigurableFileCollection
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.tasks.InputFile
+import org.gradle.api.tasks.InputFiles
+
+@CompileStatic
+abstract class CheckSAS extends CheckTask {
+
+    @InputFile abstract RegularFileProperty getInheritance()
+    @InputFiles abstract ConfigurableFileCollection getSass()
+
+    @Override
+    void check(Reporter reporter, boolean fix) {
+        final inheritance = InheritanceData.parse(this.inheritance.get().asFile)
+
+        sass.each { f ->
+            final lines = []
+            f.eachLine { line ->
+                if (line[0] == '\t') return // Skip any tabbed lines, those are ones we add
+                final idx = line.indexOf('#')
+                if (idx == 0 || line.isEmpty()) {
+                    lines.add(line)
+                    return
+                }
+                def comment = idx == -1 ? null : line.substring(idx)
+                if (idx != -1) line = line.substring(0, idx - 1)
+                final spl = (line.trim().replace('(', ' (') + '     ').split(' ', -1)
+                def (String cls, String name, String desc) = [spl[0], spl[1], spl[2]]
+                cls = cls.replaceAll('\\.', '/')
+
+                if (inheritance[cls] === null) {
+                    reporter.report("Invalid: $line")
+                } else if (name.isEmpty()) { //Class SAS
+                    final toAdd = []
+                    final clsSided = isSided(inheritance[cls])
+                    boolean sided = clsSided
+
+                    /* TODO: MergeTool doesn't do fields
+                    if (json[cls]['fields'] != null) {
+                        for (entry in json[cls]['fields']) {
+                            if (isSided(entry.value)) {
+                                sided = true
+                                toAdd.add('\t' + cls + ' ' + entry.key)
+                            }
+						}
+                    } */
+
+                    final clsInh = inheritance[cls]
+                    if (clsInh.methods) {
+                        for (entry in clsInh.methods) {
+                            if (isSided(entry.value)) {
+                                sided = true
+                                toAdd.add('\t' + cls + ' ' + entry.key.replaceAll(' ', ''))
+                                findChildMethods(inheritance, cls, entry.key).each { lines.add('\t' + it) }
+                                findChildMethods(inheritance, cls, entry.key).each { println(line + ' -- ' + it) }
+                            } else if (clsSided) {
+                                findChildMethods(inheritance, cls, entry.key).each { lines.add('\t' + it) }
+                                findChildMethods(inheritance, cls, entry.key).each { println(line + ' -- ' + it) }
+                            }
+                        }
+                    }
+
+                    if (sided) {
+                        lines.add(cls + (comment == null ? '' : ' ' + comment))
+                        lines.addAll(toAdd.sort())
+                    } else {
+                        reporter.report("Invalid: $line")
+                    }
+
+                } else if (desc.isEmpty()) { // Fields
+                    /* TODO: MergeTool doesn't do fields
+                    if (json[cls]['fields'] != null && isSided(json[cls]['fields'][name]))
+                        lines.add(cls + ' ' + name + (comment == null ? '' : ' ' + comment))
+                    else */
+                    reporter.report("Invalid: $line")
+                } else { // Methods
+                    final clsInh = inheritance[cls]
+                    if (clsInh.methods === null || !isSided(clsInh.methods[name + ' ' + desc]))
+                        reporter.report("Invalid: $line")
+                    else {
+                        lines.add(cls + ' ' + name + desc + (comment == null ? '' : ' ' + comment))
+                        findChildMethods(inheritance, cls, name + ' ' + desc).each { println(line + ' -- ' + it) }
+                        findChildMethods(inheritance, cls, name + ' ' + desc).each { lines.add('\t' + it) }
+                    }
+                }
+            }
+
+            if (fix) f.text = lines.join('\n')
+        }
+    }
+
+    protected static isSided(Annotatable annotatable) {
+        if (annotatable === null) return false
+        for (ann in annotatable.annotations) {
+            if ('Lnet/minecraftforge/api/distmarker/OnlyIn;' == ann.desc)
+                return true
+        }
+        return false
+    }
+    
+    protected static findChildMethods(Map<String, InheritanceData> json, String cls, String desc) {
+        return json.values().findAll{ it.methods != null && it.methods[desc] != null && it.methods[desc].override == cls && isSided(it.methods[desc]) }
+                .collect { it.name + ' ' + desc.replace(' ', '') } as TreeSet
+    }
+}

buildSrc/src/main/groovy/net/minecraftforge/forge/tasks/checks/CheckTask.groovy

@@ -0,0 +1,109 @@
+package net.minecraftforge.forge.tasks.checks
+
+import groovy.transform.CompileStatic
+import net.minecraftforge.forge.tasks.Util
+import org.gradle.api.Action
+import org.gradle.api.DefaultTask
+import org.gradle.api.logging.LogLevel
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.TaskAction
+import org.gradle.api.tasks.TaskContainer
+import org.gradle.api.tasks.VerificationTask
+
+@CompileStatic
+abstract class CheckTask extends DefaultTask implements VerificationTask {
+    @Input
+    abstract Property<CheckMode> getMode()
+
+    private boolean ignoreFailures = false
+
+    @Input
+    @Override
+    boolean getIgnoreFailures() {
+        return ignoreFailures
+    }
+
+    @Override
+    void setIgnoreFailures(boolean ignoreFailures) {
+        this.ignoreFailures = ignoreFailures
+    }
+
+    @TaskAction
+    void run() {
+        Util.init()
+
+        final doFix = getMode().get() === CheckMode.FIX
+        final Reporter reporter = new Reporter(doFix)
+        check(reporter, doFix)
+        
+        if (reporter.messages) {
+            if (getMode().get() === CheckMode.CHECK) {
+                logger.error("Check task '{}' found errors:\n{}", name, reporter.messages.join('\n'))
+                if (!ignoreFailures) {
+                    throw new IllegalArgumentException("${reporter.messages.size()} errors were found!")
+                }
+            } else {
+                if (logger.isEnabled(LogLevel.DEBUG)) {
+                    logger.warn("Check task '{}' found {} errors and fixed {}:\n{}", name, reporter.messages.size(), reporter.fixed.size(), reporter.fixed.join('\n'))
+                } else {
+                    logger.warn("Check task '{}' found {} errors and fixed {}.", name, reporter.messages.size(), reporter.fixed.size())
+                }
+
+                if (reporter.notFixed) {
+                    logger.error('{} errors could not be fixed:\n{}', reporter.notFixed.size(), reporter.notFixed.join('\n'))
+                    if (!ignoreFailures) {
+                        throw new IllegalArgumentException("${reporter.notFixed.size()} errors which cannot be fixed were found!")
+                    }
+                }
+            }
+        }
+    }
+
+    abstract void check(Reporter reporter, boolean fix)
+
+    @CompileStatic
+    static final class Reporter {
+        final boolean trackFixed
+        Reporter(boolean trackFixed) {
+            this.trackFixed = trackFixed
+        }
+
+        public final List<String> messages = []
+
+        public final List<String> fixed = []
+        public final List<String> notFixed = []
+
+        void report(String message, boolean canBeFixed = true) {
+            messages.add(message)
+
+            if (trackFixed) {
+                if (canBeFixed) {
+                    fixed.add(message)
+                } else {
+                    notFixed.add(message)
+                }
+            }
+        }
+    }
+
+    static <T extends CheckTask> void registerTask(TaskContainer tasks, String taskName, @DelegatesTo.Target('type') Class<T> clazz,
+                                                   @DelegatesTo(genericTypeIndex = 0, target = 'type') Closure configuration) {
+        taskName = taskName.capitalize()
+        tasks.register("check$taskName", clazz) { CheckTask task ->
+            configuration.setDelegate((T) task)
+            configuration.call(task)
+            task.mode.set(CheckMode.CHECK)
+            task.group = 'checks'
+        }
+        tasks.named('checkAll').configure { it.dependsOn("check$taskName") }
+
+        tasks.register("checkAndFix$taskName", clazz) { CheckTask task ->
+            configuration.setDelegate((T) task)
+            configuration.call(task)
+            task.mode.set(CheckMode.FIX)
+            task.group = 'checks'
+        }
+        tasks.named('checkAllAndFix').configure { it.dependsOn("checkAndFix$taskName") }
+    }
+}

docs/CONTRIBUTING.md

@@ -7,7 +7,7 @@ Contributing to Forge
 
 3) Follow the code style of the class you're working in (braces on newlines & spaces instead of tabs in Forge classes, inline brackets in patches, etc).
 
-For more information, refer to [the wiki](https://github.com/MinecraftForge/MinecraftForge/wiki/If-you-want-to-contribute-to-Forge)
+For more information, refer to [the wiki][Wiki].
 
 
 Contributor License Agreement
@@ -16,3 +16,5 @@ Contributor License Agreement
 - You assign copyright ownership of your contributions to the patches codebase (everything under patches) to Forge, where it will be licensed under the LGPLv2.1 license.
 
 "Forge" is Forge Development LLC, a legally incorporated entity in Oregon, USA.
+
+[Wiki]: https://github.com/MinecraftForge/MinecraftForge/wiki/If-you-want-to-contribute-to-Forge

docs/README.md

@@ -2,16 +2,17 @@
 
 MinecraftForge
 =============
-[![Stable Release](https://img.shields.io/badge/dynamic/json?url=https://files.minecraftforge.net/net/minecraftforge/forge/promotions_slim.json&label=Stable&prefix=1.18.2-&query=$.promos["1.18.2-recommended"]&color=brightgreen&logo=data:image/svg+xml;base64,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)](https://files.minecraftforge.net)
-[![Latest Release](https://img.shields.io/badge/dynamic/json?url=https://files.minecraftforge.net/net/minecraftforge/forge/promotions_slim.json&label=Latest&prefix=1.18.2-&query=$.promos["1.18.2-latest"]&color=blue&logo=data:image/svg+xml;base64,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
-)](https://files.minecraftforge.net) [![Discord](https://img.shields.io/discord/313125603924639766.svg?color=%237289da&label=Discord&logo=discord&logoColor=%237289da)](https://discord.gg/UvedJ9m) [![Support](https://img.shields.io/badge/Patreon-Support-orange.svg?logo=Patreon)](https://www.patreon.com/LexManos)
+[![Stable Release](https://img.shields.io/badge/dynamic/json?url=https://files.minecraftforge.net/net/minecraftforge/forge/promotions_slim.json&label=Stable&prefix=1.19.4-&query=$.promos["1.19.4-recommended"]&color=brightgreen&logo=data:image/svg+xml;base64,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)][Download]
+[![Latest Release](https://img.shields.io/badge/dynamic/json?url=https://files.minecraftforge.net/net/minecraftforge/forge/promotions_slim.json&label=Latest&prefix=1.19.4-&query=$.promos["1.19.4-latest"]&color=blue&logo=data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPHN2ZyBjbGFzcz0ic3ZnLWlubGluZS0tZmEgZmEtYnVnIGZhLXctMTYiIGFyaWEtaGlkZGVuPSJ0cnVlIiBkYXRhLWljb249ImJ1ZyIgZGF0YS1wcmVmaXg9ImZhcyIgZm9jdXNhYmxlPSJmYWxzZSIgcm9sZT0iaW1nIiB2aWV3Qm94PSIwIDAgNTEyIDUxMiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KPHBhdGggZD0iTTUxMS45ODggMjg4LjljLS40NzggMTcuNDMtMTUuMjE3IDMxLjEtMzIuNjUzIDMxLjFINDI0djE2YzAgMjEuODY0LTQuODgyIDQyLjU4NC0xMy42IDYxLjE0NWw2MC4yMjggNjAuMjI4YzEyLjQ5NiAxMi40OTcgMTIuNDk2IDMyLjc1OCAwIDQ1LjI1NS0xMi40OTggMTIuNDk3LTMyLjc1OSAxMi40OTYtNDUuMjU2IDBsLTU0LjczNi01NC43MzZDMzQ1Ljg4NiA0NjcuOTY1IDMxNC4zNTEgNDgwIDI4MCA0ODBWMjM2YzAtNi42MjctNS4zNzMtMTItMTItMTJoLTI0Yy02LjYyNyAwLTEyIDUuMzczLTEyIDEydjI0NGMtMzQuMzUxIDAtNjUuODg2LTEyLjAzNS05MC42MzYtMzIuMTA4bC01NC43MzYgNTQuNzM2Yy0xMi40OTggMTIuNDk3LTMyLjc1OSAxMi40OTYtNDUuMjU2IDAtMTIuNDk2LTEyLjQ5Ny0xMi40OTYtMzIuNzU4IDAtNDUuMjU1bDYwLjIyOC02MC4yMjhDOTIuODgyIDM3OC41ODQgODggMzU3Ljg2NCA4OCAzMzZ2LTE2SDMyLjY2NkMxNS4yMyAzMjAgLjQ5MSAzMDYuMzMuMDEzIDI4OC45LS40ODQgMjcwLjgxNiAxNC4wMjggMjU2IDMyIDI1Nmg1NnYtNTguNzQ1bC00Ni42MjgtNDYuNjI4Yy0xMi40OTYtMTIuNDk3LTEyLjQ5Ni0zMi43NTggMC00NS4yNTUgMTIuNDk4LTEyLjQ5NyAzMi43NTgtMTIuNDk3IDQ1LjI1NiAwTDE0MS4yNTUgMTYwaDIyOS40ODlsNTQuNjI3LTU0LjYyN2MxMi40OTgtMTIuNDk3IDMyLjc1OC0xMi40OTcgNDUuMjU2IDAgMTIuNDk2IDEyLjQ5NyAxMi40OTYgMzIuNzU4IDAgNDUuMjU1TDQyNCAxOTcuMjU1VjI1Nmg1NmMxNy45NzIgMCAzMi40ODQgMTQuODE2IDMxLjk4OCAzMi45ek0yNTcgMGMtNjEuODU2IDAtMTEyIDUwLjE0NC0xMTIgMTEyaDIyNEMzNjkgNTAuMTQ0IDMxOC44NTYgMCAyNTcgMHoiIGZpbGw9IndoaXRlIi8+Cjwvc3ZnPgo=
+)][Download] [![Discord](https://img.shields.io/discord/313125603924639766.svg?color=%237289da&label=Discord&logo=discord&logoColor=%237289da)][Discord] [![Support](https://img.shields.io/badge/Patreon-Support-orange.svg?logo=Patreon)][Patreon]
 
 Forge is a free, open-source modding API all of your favourite mods use!
 
 | Version |    Support    |
 |---------| ------------- |
-| 1.19.x  |    Active     |
-| 1.18.x  |    LTS        |
+| 1.20.x  |    Active     |
+| 1.19.4  |    Legacy     |
+| 1.19.2  |    Legacy     |
 
 * [Download]
 * [Forum]
@@ -20,7 +21,7 @@ Forge is a free, open-source modding API all of your favourite mods use!
 
 # Installing Forge
 
-Go to [the Forge website](https://files.minecraftforge.net)
+Go to [the Forge website][Download]
  and select the Minecraft version you wish to get Forge for from the list.
 
 You can download the installer for the *Recommended Build* or the
@@ -29,38 +30,48 @@ You can download the installer for the *Recommended Build* or the
  into your vanilla launcher environment, where you can then create a new
  profile using that version and play the game!
  
-For support and questions, visit [the Support Forum](https://www.minecraftforge.net/forum/forum/18-support-bug-reports/) or [the Forge Discord server](https://discord.gg/forge).
-
-[Here is a short video from Rorax showing how to install and setup Forge.](https://www.youtube.com/watch?v=lB3ArN_-3Oc)
+For support and questions, visit [the Support Forum][Support-Forum] or [the Forge Discord server][Discord].
 
 # Creating Mods
 
-[See the "Getting Started" section in the Forge Documentation](https://mcforge.readthedocs.io/en/latest/gettingstarted/).
+[See the "Getting Started" section in the Forge Documentation][Getting-Started].
 
 # Contribute to Forge
 
 If you wish to actually inspect Forge, submit PRs or otherwise work
  with Forge itself, you're in the right place!
 
- [See the guide to setting up a Forge workspace](http://mcforge.readthedocs.io/en/latest/forgedev/).
+ [See the guide to setting up a Forge workspace][ForgeDev].
 
 ### Pull requests
 
-[See the "Making Changes and Pull Requests" section in the Forge documentation](https://mcforge.readthedocs.io/en/latest/forgedev/#making-changes-and-pull-requests).
+[See the "Making Changes and Pull Requests" section in the Forge documentation][Pull-Requests].
 
-Please read the contributing guidelines found [here](CONTRIBUTING.md) before making a pull request.
+Please read the contributing guidelines found [here][Contributing] before making a pull request.
 
 ### Contributor License Agreement
-We require all contributors to acknowledge the [Forge Contributor License Agreement](https://cla-assistant.io/MinecraftForge/MinecraftForge). 
+We require all contributors to acknowledge the [Forge Contributor License Agreement][CLA]. 
 Please ensure you have a valid email address associated with your GitHub account to do this. If you have previously 
  signed it, you should be OK.
 
 #### Donate
 *Forge is a large project with many collaborators working on it around the clock. Forge is and will always remain free 
  to use and modify. However, it costs money to run such a large project as this, so please consider 
- [becoming a patron](https://www.patreon.com/LexManos).*
+ [becoming a patron][Patreon].*
+
+[Contributing]: ./CONTRIBUTING.md
+[CLA]: https://cla-assistant.io/MinecraftForge/MinecraftForge
 
 [Download]: https://files.minecraftforge.net/
-[Forum]: https://www.minecraftforge.net/forum/
-[Discord]: https://discord.gg/UvedJ9m
-[Documentation]: https://mcforge.readthedocs.io
+
+[Forum]: https://forums.minecraftforge.net/
+[Support-Forum]: https://forums.minecraftforge.net/forum/18-support-bug-reports/
+
+[Discord]: https://discord.minecraftforge.net/
+
+[Documentation]: https://docs.minecraftforge.net/
+[Getting-Started]: https://docs.minecraftforge.net/en/latest/gettingstarted/
+[ForgeDev]: https://docs.minecraftforge.net/en/latest/forgedev/
+[Pull-Requests]: https://docs.minecraftforge.net/en/latest/forgedev/#making-changes-and-pull-requests
+
+[Patreon]: https://www.patreon.com/LexManos

docs/SUPPORT.md

@@ -1,7 +1,7 @@
 Getting Support Surrounding Forge
 =================================
 
-**If you do not want to read the following wall of text, no matter its relevance for helping get your issue resolved quickly, please refer to the [Forge Forums](http://www.minecraftforge.net/forum/forum/18-support-bug-reports/) for support.**
+**If you do not want to read the following wall of text, no matter its relevance for helping get your issue resolved quickly, please refer to the [Forge Forums][Bug-Reports] for support.**
 
 Before reporting an issue on this repository's bug tracker, please carefully read this document. There are various resources that are more likely to be able to help you with certain kinds of issues. This document provides instructions on how to determine which place best to report to.
 
@@ -44,7 +44,7 @@ You can generally tell pretty quickly what caused the error at the head of your
  1. If you can find the name of a mod in the trace, that mod most likely is the culprit.
     - Be aware that you may find multiple mods as participants of a crash. In that case, you can either report to both or try to reason (using the names in the stacktrace) about which mod is at fault.
  2. If you can only find Forge (usually starting with `net.minecraftforge`) alongside Vanilla (usually starting with `net.minecraft`) references, chances are that you have found a bug in Forge. In this case, use one of the various [support channels](#forge-support) listed below.
-    - The occurence of a single call to Forge somewhere in the stacktrace *does not* warrant a report to Forge if there are mods present in the crash report.
+    - The occurrence of a single call to Forge somewhere in the stacktrace *does not* warrant a report to Forge if there are mods present in the crash report.
  3. If there's no mention of Forge or a mod, but any Vanilla class, you might have found a Vanilla bug. You should probably still report it via the Forge channels first, however, due the nature of modded environments and the rarity of Vanilla crash bugs.
  4. Always check whether there's a mention of coremods at the beginning of a crash report. If there is and you can't find any clear culprit, consider reporting to these coremods first, since they are free to change any of the code executed in your environment.
 
@@ -74,10 +74,10 @@ Please note that this list has to be considered incomplete as there is a large n
 
 If you're certain you've found an issue that is directly caused by Forge, you have the following three platforms available for dealing with it, with decreasing relevance for end-users:
 
- 1. **Forge Forums:** There's a dedicated [Support & Bug Report](http://www.minecraftforge.net/forum/forum/18-support-bug-reports/) section on the Forge forums, which is led by team of moderators and volunteers who will try to deal with your reports as quickly as possible. *As a player you should probably report here first.*
-   - For modders, there also is a separate [Modder Support](http://www.minecraftforge.net/forum/forum/70-modder-support/) section where you can ask all your development-related questions. *You should prefer this section for coding help.*
- 2. **Forge Discord Server:** You can find a lot of help on the official [Discord Server](https://discord.gg/forge), especially smaller issues that you quickly need help with. *Be aware that the channel is more suited towards development questions, so while you may get support there as a player, you should almost always prefer the forums.*
- 3. **Forge Issue Tracker:** If you're absolutely certain that you've found an issue in the Forge codebase (e.g. you're a modder yourself and have analyzed the stacktrace and relevant code), don't refrain from reporting it on this repository's [issue tracker](https://github.com/MinecraftForge/MinecraftForge/issues). *Please do not use the issues as a means of getting coding help. For developers, the IRC and the [official documentation](https://mcforge.readthedocs.io) are the best sources of information.*
+ 1. **Forge Forums:** There's a dedicated [Support & Bug Report][Bug-Reports] section on the Forge forums, which is led by team of moderators and volunteers who will try to deal with your reports as quickly as possible. *As a player you should probably report here first.*
+   - For modders, there also is a separate [Modder Support][Modder-Support] section where you can ask all your development-related questions. *You should prefer this section for coding help.*
+ 2. **Forge Discord Server:** You can find a lot of help on the official [Discord Server][Discord], especially smaller issues that you quickly need help with. *Be aware that the channel is more suited towards development questions, so while you may get support there as a player, you should almost always prefer the forums.*
+ 3. **Forge Issue Tracker:** If you're absolutely certain that you've found an issue in the Forge codebase (e.g. you're a modder yourself and have analyzed the stacktrace and relevant code), don't refrain from reporting it on this repository's [issue tracker](https://github.com/MinecraftForge/MinecraftForge/issues). *Please do not use the issues as a means of getting coding help. For developers, the IRC and the [official documentation][Documentation] are the best sources of information.*
 
 ### Mod Support
 
@@ -99,7 +99,7 @@ Now that you've identified the source of your issue and decided on the correct s
 ### Preventing Duplicates and Unnecessary Reports
 Use the target issue tracker's search functionality to look for issues which have descriptions similar to yours, but make sure to also search for already closed issues. If you can find one, verify it is in fact the same (or a very similar issue) and simply comment on it if you have anything else to contribute to the discussion, such as other steps to reproduce it. *Do not create duplicates of an existing issue, since it only puts extra effort on maintainers to recognize and close/mark them.*
 
-Additionally, always check the *latest* changelogs of Forge and participating mods to find out if the bug was already noticed and fixed by the developer. Often the maintainer may only support newer versions of the game, so also check the changelogs for versions of Minecraft you don't actually actively play. If the issue was adressed already, *do not report it*, even if the fix only exists for a newer version of the game, since the developer probably had a good reason to do so. If your issue only exists with versions of a mod that are for very old versions of the game, also refrain from reporting them, considering most modders only support the two latest versions of Minecraft, if at all.
+Additionally, always check the *latest* changelogs of Forge and participating mods to find out if the bug was already noticed and fixed by the developer. Often the maintainer may only support newer versions of the game, so also check the changelogs for versions of Minecraft you don't actually actively play. If the issue was addressed already, *do not report it*, even if the fix only exists for a newer version of the game, since the developer probably had a good reason to do so. If your issue only exists with versions of a mod that are for very old versions of the game, also refrain from reporting them, considering most modders only support the two latest versions of Minecraft, if at all.
 
 ### Required Information
 If you're certain that your issue went unnoticed up until now, you can get to actually writing up the report. Below you can find a list of the *required* information any bug report should contain:
@@ -144,4 +144,11 @@ After you have written your bug report, it is time to *wait*. Please be *patient
 
 Every project has a different way of dealing with issues, so don't wonder if there's no comment on it, but somebody "labels" it with certain markers. This helps developers to more easily keep track of bugs and priorities. When any further input from you is required, you will be asked specifically. Do not bug anyone through other channels about resolving your issue.
 
-Once your issue is closed, you will know whether it was valid or turned out to be irreproducible. If you included all of the data from above in your report, chances are that the latter won't be the case.
+Once your issue is closed, you will know whether it was valid or turned out to be unreproducible. If you included all of the data from above in your report, chances are that the latter won't be the case.
+
+[Bug-Reports]: https://forums.minecraftforge.net/forum/18-support-bug-reports/
+[Modder-Support]: https://forums.minecraftforge.net/forum/70-modder-support/
+
+[Discord]: https://discord.minecraftforge.net/
+
+[Documentation]: https://docs.minecraftforge.net/

fmlcore/src/main/java/net/minecraftforge/fml/CrashReportCallables.java

@@ -5,33 +5,93 @@
 
 package net.minecraftforge.fml;
 
+import com.mojang.logging.LogUtils;
+import org.slf4j.Logger;
+
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.function.BooleanSupplier;
 import java.util.function.Supplier;
 
-public class CrashReportCallables {
+public class CrashReportCallables
+{
+    private static final Logger LOGGER = LogUtils.getLogger();
     private static final List<ISystemReportExtender> crashCallables = Collections.synchronizedList(new ArrayList<>());
 
+    /**
+     * Register a custom {@link ISystemReportExtender}
+     */
     public static void registerCrashCallable(ISystemReportExtender callable)
     {
         crashCallables.add(callable);
     }
 
-    public static void registerCrashCallable(String headerName, Supplier<String> reportGenerator) {
-        registerCrashCallable(new ISystemReportExtender() {
+    /**
+     * Register a {@link ISystemReportExtender system report extender} with the given header name and content
+     * generator, which will always be appended to the system report
+     * @param headerName The name of the system report entry
+     * @param reportGenerator The report generator to be called when a crash report is built
+     */
+    public static void registerCrashCallable(String headerName, Supplier<String> reportGenerator)
+    {
+        registerCrashCallable(new ISystemReportExtender()
+        {
             @Override
-            public String getLabel() {
+            public String getLabel()
+            {
                 return headerName;
             }
+
             @Override
-            public String get() {
+            public String get()
+            {
                 return reportGenerator.get();
             }
         });
     }
 
-    public static List<ISystemReportExtender> allCrashCallables() {
+    /**
+     * Register a {@link ISystemReportExtender system report extender} with the given header name and content
+     * generator, which will only be appended to the system report when the given {@link BooleanSupplier} returns true
+     * @param headerName The name of the system report entry
+     * @param reportGenerator The report generator to be called when a crash report is built
+     * @param active The supplier of the flag to be checked when a crash report is built
+     */
+    public static void registerCrashCallable(String headerName, Supplier<String> reportGenerator, BooleanSupplier active)
+    {
+        registerCrashCallable(new ISystemReportExtender()
+        {
+            @Override
+            public String getLabel()
+            {
+                return headerName;
+            }
+
+            @Override
+            public String get()
+            {
+                return reportGenerator.get();
+            }
+
+            @Override
+            public boolean isActive()
+            {
+                try
+                {
+                    return active.getAsBoolean();
+                }
+                catch (Throwable t)
+                {
+                    LOGGER.warn("CrashCallable '{}' threw an exception while checking the active flag, disabling", headerName, t);
+                    return false;
+                }
+            }
+        });
+    }
+
+    public static List<ISystemReportExtender> allCrashCallables()
+    {
         return List.copyOf(crashCallables);
     }
 }

fmlcore/src/main/java/net/minecraftforge/fml/DeferredWorkQueue.java

@@ -11,9 +11,11 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionException;
 import java.util.concurrent.ConcurrentLinkedDeque;
 import java.util.concurrent.Executor;
 import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
 import java.util.function.Supplier;
 
 import com.google.common.base.Stopwatch;
@@ -53,17 +55,29 @@ public class DeferredWorkQueue
     public void runTasks() {
         if (tasks.isEmpty()) return;
         LOGGER.debug(LOADING, "Dispatching synchronous work for work queue {}: {} jobs", modLoadingStage, tasks.size());
+        RuntimeException aggregate = new RuntimeException();
         Stopwatch timer = Stopwatch.createStarted();
-        tasks.forEach(t->makeRunnable(t, Runnable::run));
+        tasks.forEach(t -> makeRunnable(t, Runnable::run, aggregate));
         timer.stop();
-        LOGGER.debug(LOADING, "Synchronous work queue completed in {}", timer);
+        if (aggregate.getSuppressed().length > 0) {
+            LOGGER.fatal(
+                    LOADING,
+                    "Synchronous work queue completed exceptionally in {}, see suppressed exceptions for details:",
+                    timer,
+                    aggregate
+            );
+            //TODO 1.20: throw aggregate exception
+        } else {
+            LOGGER.debug(LOADING, "Synchronous work queue completed in {}", timer);
+        }
     }
 
-    private static void makeRunnable(TaskInfo ti, Executor executor) {
+    private static void makeRunnable(TaskInfo ti, Executor executor, RuntimeException aggregate) {
         executor.execute(() -> {
             Stopwatch timer = Stopwatch.createStarted();
             ModLoadingContext.get().setActiveContainer(ti.owner);
             try {
+                ti.future.exceptionally(t -> captureException(ti.owner.getModId(), aggregate, t));
                 ti.task.run();
             } finally {
                 ModLoadingContext.get().setActiveContainer(null);
@@ -75,13 +89,38 @@ public class DeferredWorkQueue
         });
     }
 
+    private static <T> T captureException(String modId, RuntimeException aggregate, Throwable throwable) {
+        if (throwable instanceof CompletionException ce) {
+            throwable = ce.getCause();
+        }
+        aggregate.addSuppressed(throwable);
+        LOGGER.error("Mod '{}' encountered an error in a deferred task:", modId, throwable);
+        return null;
+    }
+
     public CompletableFuture<Void> enqueueWork(final ModContainer modInfo, final Runnable work) {
-        return CompletableFuture.runAsync(work, r->tasks.add(new TaskInfo(modInfo, r)));
+        return enqueueWork(modInfo, taskInfo -> CompletableFuture.runAsync(work, r -> taskInfo.task = r));
     }
 
     public <T> CompletableFuture<T> enqueueWork(final ModContainer modInfo, final Supplier<T> work) {
-        return CompletableFuture.supplyAsync(work, r->tasks.add(new TaskInfo(modInfo, r)));
+        return enqueueWork(modInfo, taskInfo -> CompletableFuture.supplyAsync(work, r -> taskInfo.task = r));
     }
 
-    record TaskInfo(ModContainer owner, Runnable task) {}
+    private <T> CompletableFuture<T> enqueueWork(final ModContainer modInfo, Function<TaskInfo, CompletableFuture<T>> futureGen) {
+        TaskInfo taskInfo = new TaskInfo(modInfo);
+        CompletableFuture<T> future = futureGen.apply(taskInfo);
+        taskInfo.future = future;
+        tasks.add(taskInfo);
+        return future;
+    }
+
+    private static class TaskInfo {
+        private final ModContainer owner;
+        private Runnable task;
+        private CompletableFuture<?> future;
+
+        private TaskInfo(ModContainer owner) {
+            this.owner = owner;
+        }
+    }
 }

fmlcore/src/main/java/net/minecraftforge/fml/IExtensionPoint.java

@@ -93,5 +93,7 @@ public interface IExtensionPoint<T extends Record>
      * @see net.minecraftforge.client.ForgeHooksClient#processForgeListPingData(net.minecraft.network.protocol.status.ServerStatus, net.minecraft.client.multiplayer.ServerData)
      */
     @SuppressWarnings("JavadocReference") // reference to NetworkConstants, ForgeHooksClient
-    record DisplayTest(Supplier<String> suppliedVersion, BiPredicate<String, Boolean> remoteVersionTest) implements IExtensionPoint<DisplayTest> {}
+    record DisplayTest(Supplier<String> suppliedVersion, BiPredicate<String, Boolean> remoteVersionTest) implements IExtensionPoint<DisplayTest> {
+        public static final String IGNORESERVERONLY = "OHNOES\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31\uD83D\uDE31";
+    }
 }

fmlcore/src/main/java/net/minecraftforge/fml/ISystemReportExtender.java

@@ -10,4 +10,9 @@ import java.util.function.Supplier;
 public interface ISystemReportExtender extends Supplier<String>
 {
     String getLabel();
+
+    default boolean isActive()
+    {
+        return true;
+    }
 }

fmlcore/src/main/java/net/minecraftforge/fml/ModContainer.java

@@ -56,9 +56,24 @@ public abstract class ModContainer
         this.namespace = this.modId;
         this.modInfo = info;
         this.modLoadingStage = ModLoadingStage.CONSTRUCT;
-        // default displaytest extension checks for version string match
-        registerExtensionPoint(IExtensionPoint.DisplayTest.class, () -> new IExtensionPoint.DisplayTest(()->this.modInfo.getVersion().toString(),
-                (incoming, isNetwork)->Objects.equals(incoming, this.modInfo.getVersion().toString())));
+
+        final String displayTestString = info.getConfig().<String>getConfigElement("displayTest").orElse("MATCH_VERSION"); // missing defaults to DEFAULT type
+        Supplier<IExtensionPoint.DisplayTest> displayTestSupplier = switch (displayTestString) {
+            case "MATCH_VERSION" -> // default displaytest checks for version string match
+                    () -> new IExtensionPoint.DisplayTest(() -> this.modInfo.getVersion().toString(),
+                        (incoming, isNetwork) -> Objects.equals(incoming, this.modInfo.getVersion().toString()));
+            case "IGNORE_SERVER_VERSION" -> // Ignores any version information coming from the server - use for server only mods
+                    () -> new IExtensionPoint.DisplayTest(() -> IExtensionPoint.DisplayTest.IGNORESERVERONLY, (incoming, isNetwork) -> true);
+            case "IGNORE_ALL_VERSION" -> // Ignores all information and provides no information
+                    () -> new IExtensionPoint.DisplayTest(() -> "", (incoming, isNetwork) -> true);
+            case "NONE" -> null; // NO display test at all - use this if you're going to do your own display test
+            default -> // any other value throws an exception
+                    throw new IllegalArgumentException("Invalid displayTest value supplied in mods.toml");
+        };
+        if (displayTestSupplier != null)
+            registerExtensionPoint(IExtensionPoint.DisplayTest.class, displayTestSupplier);
+        else
+            extensionPoints.remove(IExtensionPoint.DisplayTest.class);
     }
 
     /**

fmlcore/src/main/java/net/minecraftforge/fml/ModList.java

@@ -21,6 +21,7 @@ import java.util.AbstractMap;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.Comparator;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
@@ -53,6 +54,7 @@ public class ModList
     private List<ModContainer> mods;
     private Map<String, ModContainer> indexedMods;
     private List<ModFileScanData> modFileScanData;
+    private List<ModContainer> sortedContainers;
 
     private ModList(final List<ModFile> modFiles, final List<ModInfo> sortedList)
     {
@@ -155,6 +157,7 @@ public class ModList
     void setLoadedMods(final List<ModContainer> modContainers)
     {
         this.mods = modContainers;
+        this.sortedContainers = modContainers.stream().sorted(Comparator.comparingInt(c->sortedList.indexOf(c.getModInfo()))).toList();
         this.indexedMods = modContainers.stream().collect(Collectors.toMap(ModContainer::getModId, Function.identity()));
     }
 
@@ -218,6 +221,10 @@ public class ModList
         indexedMods.forEach(modContainerConsumer);
     }
 
+    public void forEachModInOrder(Consumer<ModContainer> containerConsumer) {
+        this.sortedContainers.forEach(containerConsumer);
+    }
+
     public <T> Stream<T> applyForEachModContainer(Function<ModContainer, T> function) {
         return indexedMods.values().stream().map(function);
     }

fmlcore/src/main/java/net/minecraftforge/fml/ModLoader.java

@@ -8,26 +8,25 @@ package net.minecraftforge.fml;
 import com.google.common.collect.ImmutableList;
 import net.minecraftforge.eventbus.api.Event;
 import net.minecraftforge.fml.event.IModBusEvent;
+import net.minecraftforge.fml.loading.FMLEnvironment;
 import net.minecraftforge.fml.loading.FMLLoader;
 import net.minecraftforge.fml.loading.LoadingModList;
 import net.minecraftforge.fml.loading.moddiscovery.InvalidModIdentifier;
-import net.minecraftforge.fml.loading.moddiscovery.ModFile;
 import net.minecraftforge.fml.loading.moddiscovery.ModFileInfo;
+import net.minecraftforge.fml.loading.moddiscovery.ModInfo;
 import net.minecraftforge.fml.loading.progress.StartupMessageManager;
 import net.minecraftforge.forgespi.language.IModInfo;
 import net.minecraftforge.forgespi.language.IModLanguageProvider;
+import net.minecraftforge.forgespi.locating.ForgeFeature;
+import net.minecraftforge.forgespi.locating.IModFile;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Optional;
+import java.util.*;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionException;
 import java.util.concurrent.Executor;
+import java.util.function.BiConsumer;
 import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.stream.Collectors;
@@ -83,6 +82,7 @@ public class ModLoader
     private boolean loadingStateValid;
     @SuppressWarnings("OptionalUsedAsFieldOrParameterType")
     private final Optional<Consumer<String>> statusConsumer = StartupMessageManager.modLoaderConsumer();
+    private final Set<IModLoadingState> completedStates = new HashSet<>();
     private ModList modList;
 
     private ModLoader()
@@ -96,7 +96,7 @@ public class ModLoader
                 .map(file -> new ModLoadingWarning(null, ModLoadingStage.VALIDATE, InvalidModIdentifier.identifyJarProblem(file.getFilePath()).orElse("fml.modloading.brokenfile"), file.getFileName()))
                 .collect(Collectors.toList());
         FMLLoader.getLoadingModList().getModFiles().stream()
-                .filter(ModFileInfo::missingLicense) //Search for files with missing licenses
+                .filter(ModFileInfo::missingLicense)
                 .filter(modFileInfo -> modFileInfo.getMods().stream().noneMatch(thisModInfo -> this.loadingExceptions.stream().map(ModLoadingException::getModInfo).anyMatch(otherInfo -> otherInfo == thisModInfo))) //Ignore files where any other mod already encountered an error
                 .map(modFileInfo -> new ModLoadingException(null, ModLoadingStage.VALIDATE, "fml.modloading.missinglicense", null, modFileInfo.getFile()))
                 .forEach(this.loadingExceptions::add);
@@ -133,6 +133,7 @@ public class ModLoader
      * @param periodicTask Optional periodic task to perform on the main thread while other activities run
      */
     public void gatherAndInitializeMods(final ModWorkManager.DrivenExecutor syncExecutor, final Executor parallelExecutor, final Runnable periodicTask) {
+        ForgeFeature.registerFeature("java_version", ForgeFeature.VersionFeatureTest.forVersionString(IModInfo.DependencySide.SERVER, System.getProperty("java.version")));
         loadingStateValid = true;
         statusConsumer.ifPresent(c->c.accept("Waiting for scan to complete"));
         FMLLoader.backgroundScanHandler.waitForScanToComplete(periodicTask);
@@ -145,6 +146,22 @@ public class ModLoader
             loadingStateValid = false;
             throw new LoadingFailedException(loadingExceptions);
         }
+        statusConsumer.ifPresent(c->c.accept("Validating features"));
+        List<? extends ForgeFeature.Bound> failedBounds = loadingModList.getMods().stream()
+                .map(ModInfo::getForgeFeatures)
+                .flatMap(Collection::stream)
+                .filter(bound -> !ForgeFeature.testFeature(FMLEnvironment.dist, bound))
+                .toList();
+
+        if (!failedBounds.isEmpty()) {
+            LOGGER.fatal(CORE, "Failed to validate feature bounds for mods");
+            modList.setLoadedMods(Collections.emptyList());
+            loadingStateValid = false;
+            throw new LoadingFailedException(failedBounds.stream()
+                    .map(fb -> new ModLoadingException(fb.modInfo(), ModLoadingStage.CONSTRUCT, "fml.modloading.feature.missing", null, fb.featureName(), fb.featureBound(), ForgeFeature.featureValue(fb)))
+                    .toList());
+        }
+
         statusConsumer.ifPresent(c->c.accept("Building Mod List"));
         final List<ModContainer> modContainers = loadingModList.getModFiles().stream()
                 .map(ModFileInfo::getFile)
@@ -184,6 +201,7 @@ public class ModLoader
         statusConsumer.ifPresent(c->c.accept(state.message().apply(this.modList)));
         state.inlineRunnable().ifPresent(a->a.accept(this.modList));
         state.buildTransition(syncExecutor, parallelExecutor).ifPresent(t->waitForTransition(state, syncExecutor, ticker, t));
+        completedStates.add(state);
     }
 
     private void dispatchAndHandleError(IModLoadingState state, ModWorkManager.DrivenExecutor syncExecutor, Executor parallelExecutor, final Runnable ticker, Function<Executor, CompletableFuture<Void>> preSyncTask, Function<Executor, CompletableFuture<Void>> postSyncTask) {
@@ -194,6 +212,7 @@ public class ModLoader
         statusConsumer.ifPresent(c->c.accept(state.message().apply(this.modList)));
         state.inlineRunnable().ifPresent(a->a.accept(this.modList));
         state.buildTransition(syncExecutor, parallelExecutor, preSyncTask, postSyncTask).ifPresent(t->waitForTransition(state, syncExecutor, ticker, t));
+        completedStates.add(state);
     }
 
     private void waitForTransition(final IModLoadingState state, final ModWorkManager.DrivenExecutor syncExecutor, final Runnable ticker, final CompletableFuture<Void> transition) {
@@ -222,7 +241,7 @@ public class ModLoader
         }
     }
 
-    private List<ModContainer> buildMods(final ModFile modFile)
+    private List<ModContainer> buildMods(final IModFile modFile)
     {
         final Map<String, IModInfo> modInfoMap = modFile.getModFileInfo().getMods().stream().collect(Collectors.toMap(IModInfo::getModId, Function.identity()));
 
@@ -234,17 +253,29 @@ public class ModLoader
                 .filter(Objects::nonNull)
                 .collect(Collectors.toList());
         if (containers.size() != modInfoMap.size()) {
+            var modIds = modInfoMap.values().stream().map(IModInfo::getModId).sorted().collect(Collectors.toList());
+            var containerIds = containers.stream().map(c -> c != null ? c.getModId() : "(null)").sorted().collect(Collectors.toList());
+
             LOGGER.fatal(LOADING,"File {} constructed {} mods: {}, but had {} mods specified: {}",
                     modFile.getFilePath(),
-                    containers.size(), containers.stream().map(c -> c != null ? c.getModId() : "(null)").sorted().collect(Collectors.toList()),
-                    modInfoMap.size(), modInfoMap.values().stream().map(IModInfo::getModId).sorted().collect(Collectors.toList()));
+                    containers.size(), containerIds,
+                    modInfoMap.size(), modIds);
+
+            var missingClasses = new ArrayList<>(modIds);
+            missingClasses.removeAll(containerIds);
+            LOGGER.fatal(LOADING, "The following classes are missing, but are reported in the mods.toml: {}", missingClasses);
+
+            var missingMods = new ArrayList<>(containerIds);
+            missingMods.removeAll(modIds);
+            LOGGER.fatal(LOADING, "The following mods are missing, but have classes in the jar: {}", missingMods);
+
             loadingExceptions.add(new ModLoadingException(null, ModLoadingStage.CONSTRUCT, "fml.modloading.missingclasses", null, modFile.getFilePath()));
         }
         // remove errored mod containers
         return containers.stream().filter(mc -> mc.modLoadingStage != ModLoadingStage.ERROR).collect(Collectors.toList());
     }
 
-    private ModContainer buildModContainerFromTOML(final ModFile modFile, final Map<String, IModInfo> modInfoMap, final Map.Entry<String, ? extends IModLanguageProvider.IModLanguageLoader> idToProviderEntry) {
+    private ModContainer buildModContainerFromTOML(final IModFile modFile, final Map<String, IModInfo> modInfoMap, final Map.Entry<String, ? extends IModLanguageProvider.IModLanguageLoader> idToProviderEntry) {
         try {
             final String modId = idToProviderEntry.getKey();
             final IModLanguageProvider.IModLanguageLoader languageLoader = idToProviderEntry.getValue();
@@ -268,12 +299,17 @@ public class ModLoader
         return get().loadingStateValid;
     }
 
+    public boolean hasCompletedState(final String stateName) {
+        IModLoadingState state = stateManager.findState(stateName);
+        return completedStates.contains(state);
+    }
+
     public <T extends Event & IModBusEvent> void runEventGenerator(Function<ModContainer, T> generator) {
         if (!loadingStateValid) {
             LOGGER.error("Cowardly refusing to send event generator to a broken mod state");
             return;
         }
-        ModList.get().forEachModContainer((id, mc) -> mc.acceptEvent(generator.apply(mc)));
+        ModList.get().forEachModInOrder(mc -> mc.acceptEvent(generator.apply(mc)));
     }
 
     public <T extends Event & IModBusEvent> void postEvent(T e) {
@@ -281,7 +317,29 @@ public class ModLoader
             LOGGER.error("Cowardly refusing to send event {} to a broken mod state", e.getClass().getName());
             return;
         }
-        ModList.get().forEachModContainer((id, mc) -> mc.acceptEvent(e));
+        ModList.get().forEachModInOrder(mc -> mc.acceptEvent(e));
+    }
+    public <T extends Event & IModBusEvent> T postEventWithReturn(T e) {
+        if (!loadingStateValid) {
+            LOGGER.error("Cowardly refusing to send event {} to a broken mod state", e.getClass().getName());
+            return e;
+        }
+        ModList.get().forEachModInOrder(mc -> mc.acceptEvent(e));
+        return e;
+    }
+    public <T extends Event & IModBusEvent> void postEventWrapContainerInModOrder(T event) {
+        postEventWithWrapInModOrder(event, (mc, e) -> ModLoadingContext.get().setActiveContainer(mc), (mc, e) -> ModLoadingContext.get().setActiveContainer(null));
+    }
+    public <T extends Event & IModBusEvent> void postEventWithWrapInModOrder(T e, BiConsumer<ModContainer, T> pre, BiConsumer<ModContainer, T> post) {
+        if (!loadingStateValid) {
+            LOGGER.error("Cowardly refusing to send event {} to a broken mod state", e.getClass().getName());
+            return;
+        }
+        ModList.get().forEachModInOrder(mc -> {
+            pre.accept(mc, e);
+            mc.acceptEvent(e);
+            post.accept(mc, e);
+        });
     }
 
     public List<ModLoadingWarning> getWarnings()

fmlcore/src/main/java/net/minecraftforge/fml/ModLoadingContext.java

@@ -5,13 +5,18 @@
 
 package net.minecraftforge.fml;
 
+import com.mojang.logging.LogUtils;
 import net.minecraftforge.fml.config.IConfigSpec;
 import net.minecraftforge.fml.config.ModConfig;
+import net.minecraftforge.fml.loading.FMLLoader;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.function.Supplier;
 
 public class ModLoadingContext
 {
+    private static final Logger LOGGER = LogUtils.getLogger();
     private static final ThreadLocal<ModLoadingContext> context = ThreadLocal.withInitial(ModLoadingContext::new);
     private Object languageExtension;
     private ModLoadingStage stage;
@@ -46,10 +51,24 @@ public class ModLoadingContext
     }
 
     public void registerConfig(ModConfig.Type type, IConfigSpec<?> spec) {
+        if (spec.isEmpty())
+        {
+            // This handles the case where a mod tries to register a config, without any options configured inside it.
+            LOGGER.debug("Attempted to register an empty config for type {} on mod {}", type, getActiveContainer().getModId());
+            return;
+        }
+
         getActiveContainer().addConfig(new ModConfig(type, spec, getActiveContainer()));
     }
 
     public void registerConfig(ModConfig.Type type, IConfigSpec<?> spec, String fileName) {
+        if (spec.isEmpty())
+        {
+            // This handles the case where a mod tries to register a config, without any options configured inside it.
+            LOGGER.debug("Attempted to register an empty config for type {} on mod {} using file name {}", type, getActiveContainer().getModId(), fileName);
+            return;
+        }
+
         getActiveContainer().addConfig(new ModConfig(type, spec, getActiveContainer(), fileName));
     }
 

fmlcore/src/main/java/net/minecraftforge/fml/ModStateManager.java

@@ -39,4 +39,13 @@ public class ModStateManager {
         nodes.forEach(n->graph.putEdge(lookup.getOrDefault(n.previous(), dummy), n));
         return TopologicalSort.topologicalSort(graph, Comparator.comparingInt(nodes::indexOf)).stream().filter(st->st!=dummy).toList();
     }
+
+    public IModLoadingState findState(final String stateName) {
+        return stateMap.values()
+                .stream()
+                .flatMap(Collection::stream)
+                .filter(mls -> mls.name().equals(stateName))
+                .findFirst()
+                .orElseThrow(() -> new IllegalArgumentException("Unknown IModLoadingState: " + stateName));
+    }
 }

fmlcore/src/main/java/net/minecraftforge/fml/VersionChecker.java

@@ -117,14 +117,22 @@ public class VersionChecker
             /**
              * Returns the response body as a String for the given URL while following redirects
              */
-            private String openUrlString(URL url) throws IOException, URISyntaxException, InterruptedException {
+            private String openUrlString(URL url, IModInfo mod) throws IOException, URISyntaxException, InterruptedException {
                 URL currentUrl = url;
+
+                final StringBuilder sb = new StringBuilder();
+                sb.append("Java-http-client/").append(System.getProperty("java.version")).append(' ');
+                sb.append("MinecraftForge/").append(FMLLoader.versionInfo().mcAndForgeVersion()).append(' ');
+                sb.append(mod.getModId()).append('/').append(mod.getVersion());
+                final String userAgent = sb.toString();
+
                 for (int redirects = 0; redirects < MAX_HTTP_REDIRECTS; redirects++)
                 {
                     var request = HttpRequest.newBuilder()
                             .uri(currentUrl.toURI())
                             .timeout(Duration.ofSeconds(HTTP_TIMEOUT_SECS))
                             .setHeader("Accept-Encoding", "gzip")
+                            .setHeader("User-Agent", userAgent)
                             .GET()
                             .build();
 
@@ -166,7 +174,7 @@ public class VersionChecker
                     URL url = mod.getUpdateURL().get();
                     LOGGER.info("[{}] Starting version check at {}", mod.getModId(), url.toString());
 
-                    String data = openUrlString(url);
+                    String data = openUrlString(url, mod);
 
                     LOGGER.debug("[{}] Received version check data:\n{}", mod.getModId(), data);
 

fmlcore/src/main/java/net/minecraftforge/fml/config/ConfigTracker.java

@@ -66,8 +66,12 @@ public class ConfigTracker {
     private void closeConfig(final ModConfig config, final Path configBasePath) {
         if (config.getConfigData() != null) {
             LOGGER.trace(CONFIG, "Closing config file type {} at {} for {}", config.getType(), config.getFileName(), config.getModId());
-            config.save();
+            // stop the filewatcher before we save the file and close it, so reload doesn't fire
             config.getHandler().unload(configBasePath, config);
+            var unloading = IConfigEvent.unloading(config);
+            if (unloading != null)
+                config.fireEvent(unloading);
+            config.save();
             config.setConfigData(null);
         }
     }

fmlcore/src/main/java/net/minecraftforge/fml/config/IConfigEvent.java

@@ -10,8 +10,11 @@ import net.minecraftforge.fml.Bindings;
 
 import java.util.function.Function;
 
+import org.jetbrains.annotations.Nullable;
+
 public interface IConfigEvent {
-    record ConfigConfig(Function<ModConfig, IConfigEvent> loading, Function<ModConfig, IConfigEvent> reloading) {}
+    record ConfigConfig(Function<ModConfig, IConfigEvent> loading, Function<ModConfig, IConfigEvent> reloading, @Nullable Function<ModConfig, IConfigEvent> unloading) {}
+
     ConfigConfig CONFIGCONFIG = Bindings.getConfigConfiguration().get();
 
     static IConfigEvent reloading(ModConfig modConfig) {
@@ -20,6 +23,9 @@ public interface IConfigEvent {
     static IConfigEvent loading(ModConfig modConfig) {
         return CONFIGCONFIG.loading().apply(modConfig);
     }
+    @Nullable static IConfigEvent unloading(ModConfig modConfig) {
+        return CONFIGCONFIG.unloading() == null ? null : CONFIGCONFIG.unloading().apply(modConfig);
+    }
     ModConfig getConfig();
 
     @SuppressWarnings("unchecked")

fmlloader/build.gradle

@@ -28,6 +28,8 @@ dependencies {
     api("cpw.mods:modlauncher:${MODLAUNCHER_VERSION}")
     api("net.minecraftforge:coremods:${COREMODS_VERSION}")
     api("com.mojang:logging:${MOJANG_LOGGING_VERSION}")
+    api "net.minecraftforge:JarJarSelector:${JARJAR_VERSION}"
+    api "net.minecraftforge:JarJarMetadata:${JARJAR_VERSION}"
 
     implementation("net.sf.jopt-simple:jopt-simple:${JOPT_SIMPLE_VERSION}")
     implementation("cpw.mods:securejarhandler:${SECUREJARHANDLER_VERSION}")

fmlloader/src/main/java/net/minecraftforge/fml/loading/ClasspathLocatorUtils.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) Forge Development LLC and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.minecraftforge.fml.loading;
+
+import com.mojang.logging.LogUtils;
+import org.slf4j.Logger;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+public class ClasspathLocatorUtils {
+    
+    private static final Logger LOGGER = LogUtils.getLogger();
+
+    public static Path findJarPathFor(final String resourceName, final String jarName, final URL resource) {
+        try {
+            Path path;
+            final URI uri = resource.toURI();
+            if (uri.getScheme().equals("jar") && uri.getRawSchemeSpecificPart().contains("!/")) {
+                int lastExcl = uri.getRawSchemeSpecificPart().lastIndexOf("!/");
+                path = Paths.get(new URI(uri.getRawSchemeSpecificPart().substring(0, lastExcl)));
+            } else {
+                path = Paths.get(new URI("file://"+uri.getRawSchemeSpecificPart().substring(0, uri.getRawSchemeSpecificPart().length()-resourceName.length())));
+            }
+            //LOGGER.debug(CORE, "Found JAR {} at path {}", jarName, path.toString());
+            return path;
+        } catch (NullPointerException | URISyntaxException e) {
+            LOGGER.error(LogMarkers.SCAN, "Failed to find JAR for class {} - {}", resourceName, jarName);
+            throw new RuntimeException("Unable to locate "+resourceName+" - "+jarName, e);
+        }
+    }
+}

fmlloader/src/main/java/net/minecraftforge/fml/loading/ClasspathTransformerDiscoverer.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) Forge Development LLC and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.minecraftforge.fml.loading;
+
+import cpw.mods.modlauncher.api.NamedPath;
+import cpw.mods.modlauncher.serviceapi.ITransformerDiscoveryService;
+import org.apache.logging.log4j.LogManager;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.*;
+
+public class ClasspathTransformerDiscoverer implements ITransformerDiscoveryService {
+
+    private final List<Path> legacyClasspath = Arrays.stream(System.getProperty("legacyClassPath", "").split(File.pathSeparator)).map(Path::of).toList();
+
+    @Override
+    public List<NamedPath> candidates(Path gameDirectory) {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public List<NamedPath> candidates(final Path gameDirectory, final String launchTarget) {
+        if (launchTarget != null && launchTarget.contains("dev")) {
+            this.scan(gameDirectory);
+        }
+        return List.copyOf(found);
+    }
+
+    private final static List<NamedPath> found = new ArrayList<>();
+
+    public static List<Path> allExcluded() {
+        return found.stream().map(np->np.paths()[0]).toList();
+    }
+    
+    private void scan(final Path gameDirectory) {
+        try {
+            locateTransformers("META-INF/services/cpw.mods.modlauncher.api.ITransformationService");
+            locateTransformers("META-INF/services/net.minecraftforge.forgespi.locating.IModLocator");
+        } catch (IOException e) {
+            LogManager.getLogger().error("Error during discovery of transform services from the classpath", e);
+        }
+    }
+
+    private void locateTransformers(String resource) throws IOException {
+        final Enumeration<URL> resources = ClassLoader.getSystemClassLoader().getResources(resource);
+        while (resources.hasMoreElements()) {
+            URL url = resources.nextElement();
+            Path path = ClasspathLocatorUtils.findJarPathFor(resource, url.toString(), url);
+            if (legacyClasspath.stream().anyMatch(path::equals) || !Files.exists(path) || Files.isDirectory(path))
+                continue;
+            found.add(new NamedPath(path.toUri().toString(), path));
+        }
+    }
+}

fmlloader/src/main/java/net/minecraftforge/fml/loading/EarlyLoadingException.java

@@ -47,7 +47,7 @@ public class EarlyLoadingException extends RuntimeException {
         return errorMessages;
     }
 
-    EarlyLoadingException(final String message, final Throwable originalException, List<ExceptionData> errorMessages) {
+    public EarlyLoadingException(final String message, final Throwable originalException, List<ExceptionData> errorMessages) {
         super(message, originalException);
         this.errorMessages = errorMessages;
     }

fmlloader/src/main/java/net/minecraftforge/fml/loading/FMLConfig.java

@@ -29,6 +29,7 @@ public class FMLConfig
         configSpec.define("maxThreads", -1);
         configSpec.define("versionCheck", Boolean.TRUE);
         configSpec.define("defaultConfigPath",  "defaultconfigs");
+        configSpec.define("disableOptimizedDFU", Boolean.TRUE);
     }
 
     private CommentedFileConfig configData;
@@ -68,7 +69,7 @@ public class FMLConfig
             LOGGER.trace(CORE, "Version check is {}", FMLConfig.runVersionCheck());
             LOGGER.trace(CORE, "Default config paths at {}", FMLConfig.defaultConfigPath());
         }
-        FMLPaths.getOrCreateGameRelativePath(Paths.get(FMLConfig.defaultConfigPath()), "default config directory");
+        FMLPaths.getOrCreateGameRelativePath(Paths.get(FMLConfig.defaultConfigPath()));
     }
 
     public static boolean splashScreenEnabled() {
@@ -88,4 +89,8 @@ public class FMLConfig
     public static String defaultConfigPath() {
         return INSTANCE.configData.<String>getOptional("defaultConfigPath").orElse("defaultconfigs");
     }
+
+    public static boolean isOptimizedDFUDisabled() {
+        return INSTANCE.configData.<Boolean>getOptional("disableOptimizedDFU").orElse(Boolean.TRUE);
+    }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/FMLPaths.java

@@ -9,6 +9,8 @@ import com.mojang.logging.LogUtils;
 import cpw.mods.modlauncher.api.IEnvironment;
 import org.slf4j.Logger;
 
+import java.io.IOException;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Arrays;
@@ -57,9 +59,13 @@ public enum FMLPaths
         for (FMLPaths path : FMLPaths.values())
         {
             path.absolutePath = rootPath.resolve(path.relativePath).toAbsolutePath().normalize();
-            if (path.isDirectory)
+            if (path.isDirectory && !Files.isDirectory(path.absolutePath))
             {
-                FileUtils.getOrCreateDirectory(path.absolutePath, path.name());
+                try {
+                   Files.createDirectories(path.absolutePath);
+                } catch (IOException e) {
+                   throw new RuntimeException(e);
+                }
             }
             if (LOGGER.isDebugEnabled(CORE))
             {
@@ -68,8 +74,26 @@ public enum FMLPaths
         }
     }
 
+    /**
+     * @deprecated Use {@link #getOrCreateGameRelativePath(Path)} instead.
+     */
+    @Deprecated(forRemoval = true, since = "1.19.4")
     public static Path getOrCreateGameRelativePath(Path path, String name) {
-        return FileUtils.getOrCreateDirectory(FMLPaths.GAMEDIR.get().resolve(path), name);
+        return getOrCreateGameRelativePath(path);
+    }
+
+    public static Path getOrCreateGameRelativePath(Path path) {
+        Path gameFolderPath = FMLPaths.GAMEDIR.get().resolve(path);
+
+        if (!Files.isDirectory(gameFolderPath)) {
+            try {
+                Files.createDirectories(gameFolderPath);
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+
+        return gameFolderPath;
     }
 
     public Path relative() {

fmlloader/src/main/java/net/minecraftforge/fml/loading/FileUtils.java

@@ -8,38 +8,29 @@ package net.minecraftforge.fml.loading;
 import com.mojang.logging.LogUtils;
 import org.slf4j.Logger;
 
+import java.io.File;
 import java.io.IOException;
-import java.nio.file.FileAlreadyExistsException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 
-import static net.minecraftforge.fml.loading.LogMarkers.CORE;
-
 public class FileUtils
 {
     private static final Logger LOGGER = LogUtils.getLogger();
 
+   /**
+    * @deprecated Use normal Java NIO methods instead
+    */
+    @Deprecated(forRemoval = true, since = "1.19.4")
     public static Path getOrCreateDirectory(Path dirPath, String dirLabel) {
-        if (!Files.isDirectory(dirPath.getParent())) {
-            getOrCreateDirectory(dirPath.getParent(), "parent of "+dirLabel);
-        }
         if (!Files.isDirectory(dirPath))
         {
-            LOGGER.debug(CORE, "Making {} directory : {}", dirLabel, dirPath);
             try {
-                Files.createDirectory(dirPath);
+                Files.createDirectories(dirPath);
             } catch (IOException e) {
-                if (e instanceof FileAlreadyExistsException) {
-                    LOGGER.error(CORE, "Failed to create {} directory - there is a file in the way", dirLabel);
-                } else {
-                    LOGGER.error(CORE, "Problem with creating {} directory (Permissions?)", dirLabel, e);
-                }
                 throw new RuntimeException("Problem creating directory", e);
             }
-            LOGGER.debug(CORE, "Created {} directory : {}", dirLabel, dirPath);
-        } else {
-            LOGGER.debug(CORE, "Found existing {} directory : {}", dirLabel, dirPath);
         }
+
         return dirPath;
     }
 
@@ -53,4 +44,16 @@ public class FileUtils
             return "";
         }
     }
+
+    public static boolean matchFileName(String path, String... matches) {
+        // Extract file name from path
+        String name = path.substring(Math.min(path.lastIndexOf(File.separatorChar) + 1, path.length()));
+        // Check if it contains any of the desired keywords
+        for (String match : matches) {
+            if (name.contains(match)) {
+                return true;
+            }
+        }
+        return false;
+    }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/LanguageLoadingProvider.java

@@ -134,7 +134,7 @@ public class LanguageLoadingProvider
     }
 
     public IModLanguageProvider findLanguage(ModFile mf, String modLoader, VersionRange modLoaderVersion) {
-        final String languageFileName = mf.getLocator() instanceof ExplodedDirectoryLocator ? "in-development" : mf.getFileName();
+        final String languageFileName = mf.getProvider() instanceof ExplodedDirectoryLocator ? "in-development" : mf.getFileName();
         final ModLanguageWrapper mlw = languageProviderMap.get(modLoader);
         if (mlw == null) {
             LOGGER.error(LOADING,"Missing language {} version {} wanted by {}", modLoader, modLoaderVersion, languageFileName);

fmlloader/src/main/java/net/minecraftforge/fml/loading/LoadingModList.java

@@ -10,11 +10,18 @@ import net.minecraftforge.fml.loading.moddiscovery.BackgroundScanHandler;
 import net.minecraftforge.fml.loading.moddiscovery.ModFile;
 import net.minecraftforge.fml.loading.moddiscovery.ModFileInfo;
 import net.minecraftforge.fml.loading.moddiscovery.ModInfo;
+import net.minecraftforge.forgespi.locating.IModFile;
 
 import java.net.URL;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Enumeration;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.NoSuchElementException;
 import java.util.stream.Collectors;
 
 /**
@@ -28,7 +35,7 @@ public class LoadingModList
     private final List<ModInfo> sortedList;
     private final Map<String, ModFileInfo> fileById;
     private final List<EarlyLoadingException> preLoadErrors;
-    private List<ModFile> brokenFiles;
+    private List<IModFile> brokenFiles;
 
     private LoadingModList(final List<ModFile> modFiles, final List<ModInfo> sortedList)
     {
@@ -154,11 +161,11 @@ public class LoadingModList
         return preLoadErrors;
     }
 
-    public void setBrokenFiles(final List<ModFile> brokenFiles) {
+    public void setBrokenFiles(final List<IModFile> brokenFiles) {
         this.brokenFiles = brokenFiles;
     }
 
-    public List<ModFile> getBrokenFiles() {
+    public List<IModFile> getBrokenFiles() {
         return this.brokenFiles;
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/ModDirTransformerDiscoverer.java

@@ -6,21 +6,27 @@
 package net.minecraftforge.fml.loading;
 
 import com.mojang.logging.LogUtils;
+import cpw.mods.jarhandling.SecureJar;
 import cpw.mods.modlauncher.api.LamdbaExceptionUtils;
 import cpw.mods.modlauncher.api.NamedPath;
 import cpw.mods.modlauncher.serviceapi.ITransformerDiscoveryService;
 import org.slf4j.Logger;
 
-import java.io.File;
 import java.io.IOException;
+import java.lang.module.ModuleDescriptor;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.zip.ZipFile;
+import java.util.Set;
 
 public class ModDirTransformerDiscoverer implements ITransformerDiscoveryService {
     private static final Logger LOGGER = LogUtils.getLogger();
+    private static final Set<String> SERVICES = Set.of(
+        "cpw.mods.modlauncher.api.ITransformationService",
+        "net.minecraftforge.forgespi.locating.IModLocator",
+        "net.minecraftforge.forgespi.locating.IDependencyLocator"
+    );
 
     @Override
     public List<NamedPath> candidates(final Path gameDirectory) {
@@ -51,14 +57,11 @@ public class ModDirTransformerDiscoverer implements ITransformerDiscoveryService
         if (!Files.isRegularFile(path)) return;
         if (!path.toString().endsWith(".jar")) return;
         if (LamdbaExceptionUtils.uncheck(() -> Files.size(path)) == 0) return;
-        try (ZipFile zf = new ZipFile(new File(path.toUri()))) {
-            if (zf.getEntry("META-INF/services/cpw.mods.modlauncher.api.ITransformationService") != null) {
-                found.add(new NamedPath(zf.getName(), path));
-            } else if (zf.getEntry("META-INF/services/net.minecraftforge.forgespi.locating.IModLocator") != null) {
-                found.add(new NamedPath(zf.getName(), path));
-            }
-        } catch (IOException ioe) {
-            LOGGER.error("Zip Error when loading jar file {}", path, ioe);
-        }
+
+        SecureJar jar = SecureJar.from(path);
+        jar.moduleDataProvider().descriptor().provides().stream()
+            .map(ModuleDescriptor.Provides::service)
+            .filter(SERVICES::contains)
+            .forEach(s -> found.add(new NamedPath(s, path)));
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/ModSorter.java

@@ -18,7 +18,6 @@ import net.minecraftforge.fml.loading.moddiscovery.ModFileInfo;
 import net.minecraftforge.fml.loading.moddiscovery.ModInfo;
 import net.minecraftforge.fml.loading.toposort.CyclePresentException;
 import net.minecraftforge.fml.loading.toposort.TopologicalSort;
-import net.minecraftforge.forgespi.locating.IModFile;
 import org.apache.maven.artifact.versioning.ArtifactVersion;
 import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
 import org.slf4j.Logger;
@@ -36,14 +35,15 @@ import static net.minecraftforge.fml.loading.LogMarkers.LOADING;
 public class ModSorter
 {
     private static final Logger LOGGER = LogUtils.getLogger();
+    private final UniqueModListBuilder uniqueModListBuilder;
     private List<ModFile> modFiles;
     private List<ModInfo> sortedList;
-    private Map<String, ModInfo> modIdNameLookup;
+    private Map<String, IModInfo> modIdNameLookup;
     private List<ModFile> systemMods;
 
     private ModSorter(final List<ModFile> modFiles)
     {
-        this.modFiles = modFiles;
+        this.uniqueModListBuilder = new UniqueModListBuilder(modFiles);
     }
 
     public static LoadingModList sort(List<ModFile> mods, final List<ExceptionData> errors)
@@ -78,11 +78,12 @@ public class ModSorter
         // lambdas are identity based, so sorting them is impossible unless you hold reference to them
         final MutableGraph<ModFileInfo> graph = GraphBuilder.directed().build();
         AtomicInteger counter = new AtomicInteger();
-        Map<IModFileInfo, Integer> infos = modFiles.stream()
+        Map<ModFileInfo, Integer> infos = modFiles.stream()
                 .map(ModFile::getModFileInfo)
                 .filter(ModFileInfo.class::isInstance)
+                .map(ModFileInfo.class::cast)
                 .collect(toMap(Function.identity(), e -> counter.incrementAndGet()));
-        infos.keySet().forEach(i -> graph.addNode((ModFileInfo) i));
+        infos.keySet().forEach(graph::addNode);
         modFiles.stream()
                 .map(ModFile::getModInfos)
                 .<IModInfo>mapMulti(Iterable::forEach)
@@ -124,10 +125,9 @@ public class ModSorter
     private void addDependency(MutableGraph<ModFileInfo> topoGraph, IModInfo.ModVersion dep)
     {
         final ModFileInfo self = (ModFileInfo)dep.getOwner().getOwningFile();
-        final ModInfo targetModInfo = modIdNameLookup.get(dep.getModId());
+        final IModInfo targetModInfo = modIdNameLookup.get(dep.getModId());
         // soft dep that doesn't exist. Just return. No edge required.
-        if (targetModInfo == null) return;
-        final ModFileInfo target = targetModInfo.getOwningFile();
+        if (targetModInfo == null || !(targetModInfo.getOwningFile() instanceof final ModFileInfo target)) return;
         if (self == target)
             return; // in case a jar has two mods that have dependencies between
         switch (dep.getOrdering()) {
@@ -138,19 +138,32 @@ public class ModSorter
 
     private void buildUniqueList()
     {
-        // Collect mod files by module name. This will be used for deduping purposes
-        final Map<String, List<IModFile>> modFilesByFirstId = modFiles.stream()
-                .collect(groupingBy(mf -> mf.getModFileInfo().moduleName()));
+        final UniqueModListBuilder.UniqueModListData uniqueModListData = uniqueModListBuilder.buildUniqueList();
 
+        this.modFiles = uniqueModListData.modFiles();
+
+        detectSystemMods(uniqueModListData.modFilesByFirstId());
+
+        modIdNameLookup = uniqueModListData.modFilesByFirstId().entrySet().stream()
+                .filter(e -> !e.getValue().get(0).getModInfos().isEmpty())
+                .collect(Collectors.toMap(
+                    Map.Entry::getKey,
+                    e -> e.getValue().get(0).getModInfos().get(0)
+                  ));
+    }
+
+    private void detectSystemMods(final Map<String, List<ModFile>> modFilesByFirstId)
+    {
         // Capture system mods (ex. MC, Forge) here, so we can keep them for later
         final Set<String> systemMods = new HashSet<>();
         // The minecraft mod is always a system mod
         systemMods.add("minecraft");
         // Find mod file from MinecraftLocator to define the system mods
         modFiles.stream()
-                .filter(modFile -> modFile.getLocator().getClass() == MinecraftLocator.class)
+                .filter(modFile -> modFile.getProvider().getClass() == MinecraftLocator.class)
                 .map(ModFile::getSecureJar)
-                .map(SecureJar::getManifest)
+                .map(SecureJar::moduleDataProvider)
+                .map(SecureJar.ModuleDataProvider::getManifest)
                 .map(Manifest::getMainAttributes)
                 .map(mf -> mf.getValue("FML-System-Mods"))
                 .filter(Objects::nonNull)
@@ -168,47 +181,6 @@ public class ModSorter
                 throw new IllegalStateException("Failed to find system mod: " + systemMod);
             }
         }
-
-        // Select the newest by artifact version sorting of non-unique files thus identified
-        this.modFiles = modFilesByFirstId.entrySet().stream()
-                .map(this::selectNewestModInfo)
-                .map(Map.Entry::getValue)
-                .map(ModFile.class::cast)
-                .collect(toList());
-
-        // Transform to the full mod id list
-        final Map<String, List<ModInfo>> modIds = modFiles.stream()
-                .map(ModFile::getModInfos)
-                .flatMap(Collection::stream)
-                .map(ModInfo.class::cast)
-                .collect(groupingBy(IModInfo::getModId));
-
-        // Its theoretically possible that some mod has somehow moved an id to a secondary place, thus causing a dupe.
-        // We can't handle this
-        final List<ModInfo> dupedMods = modIds.values().stream()
-                .filter(modInfos -> modInfos.size() > 1)
-                .map(modInfos -> modInfos.get(0))
-                .toList();
-
-        if (!dupedMods.isEmpty()) {
-            final List<EarlyLoadingException.ExceptionData> duplicateModErrors = dupedMods.stream()
-                    .map(dm -> new EarlyLoadingException.ExceptionData("fml.modloading.dupedmod",
-                            dm, Objects.toString(dm))).toList();
-            throw new EarlyLoadingException("Duplicate mods found", null,  duplicateModErrors);
-        }
-
-        modIdNameLookup = modIds.entrySet().stream()
-                .collect(toMap(Map.Entry::getKey, e -> e.getValue().get(0)));
-    }
-
-    private Map.Entry<String, IModFile> selectNewestModInfo(Map.Entry<String, List<IModFile>> fullList) {
-        List<IModFile> modInfoList = fullList.getValue();
-        if (modInfoList.size() > 1) {
-            LOGGER.debug("Found {} mods for first modid {}, selecting most recent based on version data", modInfoList.size(), fullList.getKey());
-            modInfoList.sort(Comparator.<IModFile, ArtifactVersion>comparing(mf -> mf.getModInfos().get(0).getVersion()).reversed());
-            LOGGER.debug("Selected file {} for modid {} with version {}", modInfoList.get(0).getFileName(), fullList.getKey(), modInfoList.get(0).getModInfos().get(0).getVersion());
-        }
-        return Map.entry(fullList.getKey(), modInfoList.get(0));
     }
 
     private List<EarlyLoadingException.ExceptionData> verifyDependencyVersions()
@@ -238,10 +210,24 @@ public class ModSorter
 
         if (!missingVersions.isEmpty()) {
             if (mandatoryMissing > 0) {
-                LOGGER.error(LOADING, "Missing mandatory dependencies: {}", missingVersions.stream().filter(IModInfo.ModVersion::isMandatory).map(IModInfo.ModVersion::getModId).collect(Collectors.joining(", ")));
+                LOGGER.error(
+                        LOADING,
+                        "Missing or unsupported mandatory dependencies:\n{}",
+                        missingVersions.stream()
+                                .filter(IModInfo.ModVersion::isMandatory)
+                                .map(ver -> formatDependencyError(ver, modVersions))
+                                .collect(Collectors.joining("\n"))
+                );
             }
             if (missingVersions.size() - mandatoryMissing > 0) {
-                LOGGER.error(LOADING, "Unsupported installed optional dependencies: {}", missingVersions.stream().filter(ver -> !ver.isMandatory()).map(IModInfo.ModVersion::getModId).collect(Collectors.joining(", ")));
+                LOGGER.error(
+                        LOADING,
+                        "Unsupported installed optional dependencies:\n{}",
+                        missingVersions.stream()
+                                .filter(ver -> !ver.isMandatory())
+                                .map(ver -> formatDependencyError(ver, modVersions))
+                                .collect(Collectors.joining("\n"))
+                );
             }
 
             return missingVersions.stream()
@@ -253,6 +239,18 @@ public class ModSorter
         return Collections.emptyList();
     }
 
+    private static String formatDependencyError(IModInfo.ModVersion dependency, Map<String, ArtifactVersion> modVersions)
+    {
+        ArtifactVersion installed = modVersions.get(dependency.getModId());
+        return String.format(
+                "\tMod ID: '%s', Requested by: '%s', Expected range: '%s', Actual version: '%s'",
+                dependency.getModId(),
+                dependency.getOwner().getModId(),
+                dependency.getVersionRange(),
+                installed != null ? installed.toString() : "[MISSING]"
+        );
+    }
+
     private boolean modVersionNotContained(final IModInfo.ModVersion mv, final Map<String, ArtifactVersion> modVersions)
     {
         return !(VersionSupportMatrix.testVersionSupportMatrix(mv.getVersionRange(), mv.getModId(), "mod", (modId, range) -> modVersions.containsKey(modId) &&

fmlloader/src/main/java/net/minecraftforge/fml/loading/UniqueModListBuilder.java

@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) Forge Development LLC and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.minecraftforge.fml.loading;
+
+import com.mojang.logging.LogUtils;
+import net.minecraftforge.fml.loading.moddiscovery.ModFile;
+import net.minecraftforge.forgespi.language.IModInfo;
+import org.apache.maven.artifact.versioning.ArtifactVersion;
+import org.slf4j.Logger;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import static java.util.stream.Collectors.groupingBy;
+import static java.util.stream.Collectors.joining;
+import static net.minecraftforge.fml.loading.LogMarkers.LOADING;
+
+public class UniqueModListBuilder
+{
+    private final static Logger LOGGER = LogUtils.getLogger();
+
+    private final List<ModFile> modFiles;
+
+    public UniqueModListBuilder(final List<ModFile> modFiles) {this.modFiles = modFiles;}
+
+    public UniqueModListData buildUniqueList()
+    {
+        List<ModFile> uniqueModList;
+        List<ModFile> uniqueLibListWithVersion;
+
+        // Collect mod files by module name. This will be used for deduping purposes
+        final Map<String, List<ModFile>> modFilesByFirstId = modFiles.stream()
+                .filter(mf -> mf.getModFileInfo() != null)
+                .collect(groupingBy(UniqueModListBuilder::getModId));
+
+        final Map<String, List<ModFile>> libFilesWithVersionByModuleName = modFiles.stream()
+                .filter(mf -> mf.getModFileInfo() == null)
+                .collect(groupingBy(UniqueModListBuilder::getModId));
+
+        // Select the newest by artifact version sorting of non-unique files thus identified
+        uniqueModList = modFilesByFirstId.entrySet().stream()
+                .map(this::selectNewestModInfo)
+                .toList();
+
+        // Select the newest by artifact version sorting of non-unique files thus identified
+        uniqueLibListWithVersion = libFilesWithVersionByModuleName.entrySet().stream()
+                .map(this::selectNewestModInfo)
+                .toList();
+
+        // Transform to the full mod id list
+        final Map<String, List<IModInfo>> modIds = uniqueModList.stream()
+                .filter(mf -> mf.getModFileInfo() != null) //Filter out non-mod files, we don't care about those for now.....
+                .map(ModFile::getModInfos)
+                .flatMap(Collection::stream)
+                .collect(groupingBy(IModInfo::getModId));
+
+        // Transform to the full lib id list
+        final Map<String, List<ModFile>> versionedLibIds = uniqueLibListWithVersion.stream()
+                .map(UniqueModListBuilder::getModId)
+                .collect(Collectors.toMap(
+                    Function.identity(),
+                    libFilesWithVersionByModuleName::get
+                ));
+
+        // Its theoretically possible that some mod has somehow moved an id to a secondary place, thus causing a dupe.
+        // We can't handle this
+        final List<String> dupedModErrors = modIds.values().stream()
+                .filter(modInfos -> modInfos.size() > 1)
+                .map(mods -> String.format("\tMod ID: '%s' from mod files: %s",
+                        mods.get(0).getModId(),
+                        mods.stream()
+                                .map(modInfo -> modInfo.getOwningFile().getFile().getFileName()).collect(joining(", "))
+                )).toList();
+
+        if (!dupedModErrors.isEmpty()) {
+            LOGGER.error(LOADING, "Found duplicate mods:\n{}", dupedModErrors.stream().collect(joining("\n")));
+            throw new EarlyLoadingException("Duplicate mods found", null, dupedModErrors.stream()
+                    .map(s -> new EarlyLoadingException.ExceptionData(s))
+                    .toList());
+        }
+
+
+        final List<String> dupedLibErrors = versionedLibIds.values().stream()
+                .filter(modFiles -> modFiles.size() > 1)
+                .map(mods -> String.format("\tLibrary: '%s' from files: %s",
+                        getModId(mods.get(0)),
+                        mods.stream()
+                                .map(modFile -> modFile.getFileName()).collect(joining(", "))
+                )).toList();
+
+        if (!dupedLibErrors.isEmpty()) {
+            LOGGER.error(LOADING, "Found duplicate plugins or libraries:\n{}", dupedLibErrors.stream().collect(joining("\n")));
+            throw new EarlyLoadingException("Duplicate plugins or libraries found", null, dupedLibErrors.stream()
+                    .map(s -> new EarlyLoadingException.ExceptionData(s))
+                    .toList());
+        }
+
+        // Collect unique mod files by module name. This will be used for deduping purposes
+        final Map<String, List<ModFile>> uniqueModFilesByFirstId = uniqueModList.stream()
+                .collect(groupingBy(UniqueModListBuilder::getModId));
+
+        final List<ModFile> loadedList = new ArrayList<>();
+        loadedList.addAll(uniqueModList);
+        loadedList.addAll(uniqueLibListWithVersion);
+
+        return new UniqueModListData(loadedList, uniqueModFilesByFirstId);
+    }
+
+    private ModFile selectNewestModInfo(Map.Entry<String, List<ModFile>> fullList) {
+        List<ModFile> modInfoList = fullList.getValue();
+        if (modInfoList.size() > 1) {
+            LOGGER.debug("Found {} mods for first modid {}, selecting most recent based on version data", modInfoList.size(), fullList.getKey());
+            modInfoList.sort(Comparator.comparing(this::getVersion).reversed());
+            LOGGER.debug("Selected file {} for modid {} with version {}", modInfoList.get(0).getFileName(), fullList.getKey(), this.getVersion(modInfoList.get(0)));
+        }
+        return modInfoList.get(0);
+    }
+
+    private ArtifactVersion getVersion(final ModFile mf)
+    {
+        if (mf.getModFileInfo() == null || mf.getModInfos() == null || mf.getModInfos().isEmpty()) {
+            return mf.getJarVersion();
+        }
+
+        return mf.getModInfos().get(0).getVersion();
+    }
+
+    private static String getModId(ModFile modFile) {
+        if (modFile.getModFileInfo() == null || modFile.getModFileInfo().getMods().isEmpty()) {
+            return modFile.getSecureJar().name();
+        }
+
+        return modFile.getModFileInfo().moduleName();
+    }
+
+    public record UniqueModListData(List<ModFile> modFiles, Map<String, List<ModFile>> modFilesByFirstId) {}
+
+}

fmlloader/src/main/java/net/minecraftforge/fml/loading/VersionSupportMatrix.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading;
 
+import net.minecraftforge.forgespi.language.MavenVersionAdapter;
 import org.apache.maven.artifact.versioning.ArtifactVersion;
 import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
 import org.apache.maven.artifact.versioning.VersionRange;
@@ -18,16 +19,12 @@ public class VersionSupportMatrix {
     private static final HashMap<String, List<ArtifactVersion>> overrideVersions = new HashMap<>();
     static {
         final ArtifactVersion version = new DefaultArtifactVersion(FMLLoader.versionInfo().mcVersion());
-        // if (MavenVersionAdapter.createFromVersionSpec("[1.16.4,1.16.5]").containsVersion(version)) {
-        //     // 1.16.4 is Compatible with 1.16.3
-        //     add("languageloader.javafml", "34");
-        //     add("mod.minecraft",          "1.16.3");
-        //     add("mod.forge",              "34.1.42");
-        //     // 1.16.5 is Compatible with 1.16.4, and thus 1.16.3
-        //     add("languageloader.javafml", "35");
-        //     add("mod.minecraft",          "1.16.4");
-        //     add("mod.forge",              "35.1.37");
-        // }
+         if (MavenVersionAdapter.createFromVersionSpec("[1.19.2]").containsVersion(version)) {
+             // 1.19.2 is Compatible with 1.19.1
+             add("languageloader.javafml", "42");
+             add("mod.minecraft",          "1.19.1");
+             add("mod.forge",              "42.0.9");
+        }
     }
     private static void add(String key, String value) {
         overrideVersions.computeIfAbsent(key, k -> new ArrayList<>()).add(new DefaultArtifactVersion(value));

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/AbstractJarFileDependencyLocator.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) Forge Development LLC and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.minecraftforge.fml.loading.moddiscovery;
+
+import com.mojang.logging.LogUtils;
+import net.minecraftforge.forgespi.locating.IDependencyLocator;
+import net.minecraftforge.forgespi.locating.IModFile;
+import net.minecraftforge.forgespi.locating.ModFileLoadingException;
+import org.slf4j.Logger;
+
+import java.io.FileNotFoundException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Optional;
+
+public abstract class AbstractJarFileDependencyLocator extends AbstractJarFileModProvider implements IDependencyLocator
+{
+    private static final Logger LOGGER = LogUtils.getLogger();
+
+    protected Optional<InputStream> loadResourceFromModFile(final IModFile modFile, final Path path) {
+        try {
+            return Optional.of(Files.newInputStream(modFile.findResource(path.toString())));
+        }
+        catch (final FileNotFoundException e) {
+            LOGGER.debug("Failed to load resource {} from {}, it does not contain dependency information.", path, modFile.getFileName());
+            return Optional.empty();
+        }
+        catch (final Exception e) {
+            LOGGER.error("Failed to load resource {} from mod {}, cause {}", path, modFile.getFileName(), e);
+            return Optional.empty();
+        }
+    }
+
+    protected Optional<IModFile> loadModFileFrom(final IModFile file, final Path path) {
+        try {
+            final Path pathInModFile = file.findResource(path.toString());
+            return Optional.of(createMod(pathInModFile).file());
+        }
+        catch (Exception e) {
+            LOGGER.error("Failed to load mod file {} from {}", path, file.getFileName());
+            throw new ModFileLoadingException("Failed to load mod file "+file.getFileName());
+        }
+    }
+
+    protected String identifyMod(final IModFile modFile) {
+        return modFile.getFileName();
+    }
+}

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/AbstractJarFileModLocator.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) Forge Development LLC and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.minecraftforge.fml.loading.moddiscovery;
+
+import net.minecraftforge.forgespi.locating.IModLocator;
+
+import java.nio.file.Path;
+import java.util.List;
+import java.util.stream.Stream;
+
+public abstract class AbstractJarFileModLocator extends AbstractJarFileModProvider implements IModLocator
+{
+    @Override
+    public List<IModLocator.ModFileOrException> scanMods()
+    {
+        return scanCandidates().map(this::createMod).toList();
+    }
+
+    public abstract Stream<Path> scanCandidates();
+}

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/AbstractJarFileModProvider.java

@@ -7,20 +7,19 @@ package net.minecraftforge.fml.loading.moddiscovery;
 
 import com.mojang.logging.LogUtils;
 import cpw.mods.jarhandling.SecureJar;
-import java.io.IOException;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.util.List;
-import java.util.Optional;
-import java.util.function.Consumer;
-import java.util.function.Function;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
 import net.minecraftforge.fml.loading.LogMarkers;
 import net.minecraftforge.forgespi.locating.IModFile;
 import org.slf4j.Logger;
 
-public abstract class AbstractJarFileLocator extends AbstractModLocator {
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+public abstract class AbstractJarFileModProvider extends AbstractModProvider
+{
     private static final Logger LOGGER = LogUtils.getLogger();
 
     @Override
@@ -34,15 +33,4 @@ public abstract class AbstractJarFileLocator extends AbstractModLocator {
         }
         LOGGER.debug(LogMarkers.SCAN,"Scan finished: {}", file);
     }
-
-    @Override
-    public List<IModFile> scanMods() {
-        return scanCandidates()
-                .map(this::createMod)
-                .filter(Optional::isPresent)
-                .map(Optional::get)
-                .collect(Collectors.toList());
-    }
-
-    public abstract Stream<Path> scanCandidates();
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/AbstractModLocator.java

@@ -1,96 +0,0 @@
-/*
- * Copyright (c) Forge Development LLC and contributors
- * SPDX-License-Identifier: LGPL-2.1-only
- */
-
-package net.minecraftforge.fml.loading.moddiscovery;
-
-import com.mojang.logging.LogUtils;
-import cpw.mods.jarhandling.JarMetadata;
-import cpw.mods.jarhandling.SecureJar;
-import net.minecraftforge.fml.loading.LogMarkers;
-import net.minecraftforge.forgespi.language.IConfigurable;
-import net.minecraftforge.forgespi.language.IModFileInfo;
-import net.minecraftforge.forgespi.language.IModInfo;
-import net.minecraftforge.forgespi.locating.IModFile;
-import net.minecraftforge.forgespi.locating.IModLocator;
-import org.slf4j.Logger;
-
-import java.nio.file.Path;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-import java.util.Optional;
-import java.util.function.Function;
-import java.util.jar.Manifest;
-
-public abstract class AbstractModLocator implements IModLocator {
-    private static final Logger LOGGER = LogUtils.getLogger();
-    protected static final String MODS_TOML = "META-INF/mods.toml";
-    protected static final String MANIFEST = "META-INF/MANIFEST.MF";
-
-    protected Optional<IModFile> createMod(Path... path) {
-        var mjm = new ModJarMetadata();
-        var sj = SecureJar.from(
-                Manifest::new,
-                jar -> jar.findFile(MODS_TOML).isPresent() ? mjm : JarMetadata.from(jar, path),
-                (root, p) -> true,
-                path
-        );
-
-        IModFile mod;
-        var type = sj.getManifest().getMainAttributes().getValue(ModFile.TYPE);
-        if (sj.findFile(MODS_TOML).isPresent()) {
-            LOGGER.debug(LogMarkers.SCAN, "Found {} mod of type {}: {}", MODS_TOML, type, path);
-            mod = new ModFile(sj, this, ModFileParser::modsTomlParser);
-        } else if (type != null) {
-            LOGGER.debug(LogMarkers.SCAN, "Found {} mod of type {}: {}", MANIFEST, type, path);
-            mod = new ModFile(sj, this, this::manifestParser);
-        } else {
-            return Optional.empty();
-        }
-
-        mjm.setModFile(mod);
-        return Optional.of(mod);
-    }
-
-    protected IModFileInfo manifestParser(final IModFile mod) {
-        Function<String, Optional<String>> cfg = name -> Optional.ofNullable(mod.getSecureJar().getManifest().getMainAttributes().getValue(name));
-        var license = cfg.apply("LICENSE").orElse("");
-        var dummy = new IConfigurable() {
-            @Override
-            public <T> Optional<T> getConfigElement(String... key) {
-                return Optional.empty();
-            }
-            @Override
-            public List<? extends IConfigurable> getConfigList(String... key) {
-                return Collections.emptyList();
-            }
-        };
-
-        return new IModFileInfo() {
-            @Override public List<IModInfo> getMods() { return Collections.emptyList(); }
-            @Override public List<LanguageSpec> requiredLanguageLoaders() { return Collections.emptyList(); }
-            @Override public boolean showAsResourcePack() { return false; }
-            @Override public Map<String, Object> getFileProperties() { return Collections.emptyMap(); }
-            @Override public String getLicense() { return license; }
-            @Override public IModFile getFile() { return mod; }
-            @Override public IConfigurable getConfig() { return dummy; }
-
-            // These Should never be called as it's only called from ModJarMetadata.version and we bypass that
-            @Override public String moduleName() { return mod.getSecureJar().name(); }
-            @Override public String versionString() { return null; }
-            @Override public List<String> usesServices() { return null; }
-
-            @Override
-            public String toString() {
-                return "IModFileInfo(" + mod.getFilePath() + ")";
-            }
-        };
-    }
-
-    @Override
-    public boolean isValid(final IModFile modFile) {
-        return true;
-    }
-}

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/AbstractModProvider.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) Forge Development LLC and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.minecraftforge.fml.loading.moddiscovery;
+
+import com.mojang.logging.LogUtils;
+import cpw.mods.jarhandling.JarMetadata;
+import cpw.mods.jarhandling.SecureJar;
+import net.minecraftforge.fml.loading.LogMarkers;
+import net.minecraftforge.forgespi.language.IConfigurable;
+import net.minecraftforge.forgespi.language.IModFileInfo;
+import net.minecraftforge.forgespi.language.IModInfo;
+import net.minecraftforge.forgespi.locating.IModFile;
+import net.minecraftforge.forgespi.locating.IModLocator;
+import net.minecraftforge.forgespi.locating.IModProvider;
+import net.minecraftforge.forgespi.locating.ModFileLoadingException;
+import org.slf4j.Logger;
+
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.Function;
+import java.util.jar.Manifest;
+
+public abstract class AbstractModProvider implements IModProvider
+{
+    private static final   Logger LOGGER    = LogUtils.getLogger();
+    protected static final String MODS_TOML = "META-INF/mods.toml";
+    protected static final String MANIFEST = "META-INF/MANIFEST.MF";
+
+    protected IModLocator.ModFileOrException createMod(Path... path) {
+        var mjm = new ModJarMetadata();
+        var sj = SecureJar.from(
+                Manifest::new,
+                jar -> jar.moduleDataProvider().findFile(MODS_TOML).isPresent() ? mjm : JarMetadata.from(jar, path),
+                (root, p) -> true,
+                path
+        );
+
+        IModFile mod;
+        var type = sj.moduleDataProvider().getManifest().getMainAttributes().getValue(ModFile.TYPE);
+        if (type == null) {
+            type = getDefaultJarModType();
+        }
+        if (sj.moduleDataProvider().findFile(MODS_TOML).isPresent()) {
+            LOGGER.debug(LogMarkers.SCAN, "Found {} mod of type {}: {}", MODS_TOML, type, path);
+            mod = new ModFile(sj, this, ModFileParser::modsTomlParser);
+        } else if (type != null) {
+            LOGGER.debug(LogMarkers.SCAN, "Found {} mod of type {}: {}", MANIFEST, type, path);
+            mod = new ModFile(sj, this, this::manifestParser, type);
+        } else {
+            return new IModLocator.ModFileOrException(null, new ModFileLoadingException("Invalid mod file found "+ Arrays.toString(path)));
+        }
+
+        mjm.setModFile(mod);
+        return new IModLocator.ModFileOrException(mod, null);
+    }
+
+    protected IModFileInfo manifestParser(final IModFile mod) {
+        Function<String, Optional<String>> cfg = name -> Optional.ofNullable(mod.getSecureJar().moduleDataProvider().getManifest().getMainAttributes().getValue(name));
+        var license = cfg.apply("LICENSE").orElse("");
+        var dummy = new IConfigurable() {
+            @Override
+            public <T> Optional<T> getConfigElement(String... key) {
+                return Optional.empty();
+            }
+            @Override
+            public List<? extends IConfigurable> getConfigList(String... key) {
+                return Collections.emptyList();
+            }
+        };
+
+        return new DefaultModFileInfo(mod, license, dummy);
+    }
+
+    @Override
+    public boolean isValid(final IModFile modFile) {
+        return true;
+    }
+
+    protected String getDefaultJarModType() {
+        return null;
+    }
+
+    private record DefaultModFileInfo(IModFile mod, String license, IConfigurable configurable) implements IModFileInfo, IConfigurable {
+        @Override
+        public <T> Optional<T> getConfigElement(final String... strings)
+        {
+            return Optional.empty();
+        }
+
+        @Override
+        public List<? extends IConfigurable> getConfigList(final String... strings)
+        {
+            return null;
+        }
+
+        @Override public List<IModInfo> getMods() { return Collections.emptyList(); }
+        @Override public List<LanguageSpec> requiredLanguageLoaders() { return Collections.emptyList(); }
+        @Override public boolean showAsResourcePack() { return false; }
+        @Override public Map<String, Object> getFileProperties() { return Collections.emptyMap(); }
+        @Override
+        public String getLicense() { return license; }
+
+        @Override public IModFile getFile() { return mod; }
+        @Override public IConfigurable getConfig() { return configurable; }
+
+        // These Should never be called as it's only called from ModJarMetadata.version and we bypass that
+        @Override public String moduleName() { return mod.getSecureJar().name(); }
+        @Override public String versionString() { return null; }
+        @Override public List<String> usesServices() { return null; }
+
+        @Override
+        public String toString() {
+            return "IModFileInfo(" + mod.getFilePath() + ")";
+        }
+    }
+}

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/ClasspathLocator.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.moddiscovery;
 
+import net.minecraftforge.fml.loading.ClasspathLocatorUtils;
 import com.mojang.logging.LogUtils;
 import net.minecraftforge.fml.loading.LogMarkers;
 import org.slf4j.Logger;
@@ -24,7 +25,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Stream;
 
-public class ClasspathLocator extends AbstractJarFileLocator {
+public class ClasspathLocator extends AbstractJarFileModLocator
+{
     private static final Logger LOGGER = LogUtils.getLogger();
     private final List<Path> legacyClasspath = Arrays.stream(System.getProperty("legacyClassPath", "").split(File.pathSeparator)).map(Path::of).toList();
     private boolean enabled = false;
@@ -58,7 +60,7 @@ public class ClasspathLocator extends AbstractJarFileLocator {
         final Enumeration<URL> resources = ClassLoader.getSystemClassLoader().getResources(resource);
         while (resources.hasMoreElements()) {
             URL url = resources.nextElement();
-            Path path = findJarPathFor(resource, resource, url);
+            Path path = ClasspathLocatorUtils.findJarPathFor(resource, resource, url);
             if (claimed.stream().anyMatch(path::equals) || !Files.exists(path) || Files.isDirectory(path))
                 continue;
             ret.add(path);

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/ExplodedDirectoryLocator.java

@@ -30,14 +30,14 @@ public class ExplodedDirectoryLocator implements IModLocator {
     private final Map<ExplodedMod, IModFile> mods = new HashMap<>();
 
     @Override
-    public List<IModFile> scanMods() {
+    public List<IModLocator.ModFileOrException> scanMods() {
         explodedMods.forEach(explodedMod ->
                 ModJarMetadata.buildFile(this,
-                        jar->jar.findFile("/META-INF/mods.toml").isPresent(),
+                        jar->jar.moduleDataProvider().findFile("/META-INF/mods.toml").isPresent(),
                         (a,b) -> true,
                         explodedMod.paths().toArray(Path[]::new))
                 .ifPresentOrElse(f->mods.put(explodedMod, f), () -> LOGGER.warn(LogMarkers.LOADING, "Failed to find exploded resource mods.toml in directory {}", explodedMod.paths().get(0).toString())));
-        return List.copyOf(mods.values());
+        return mods.values().stream().map(mf->new IModLocator.ModFileOrException(mf, null)).toList();
     }
 
     @Override

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/InvalidModFileException.java

@@ -6,16 +6,22 @@
 package net.minecraftforge.fml.loading.moddiscovery;
 
 import net.minecraftforge.forgespi.language.IModFileInfo;
+import net.minecraftforge.forgespi.locating.ModFileLoadingException;
 
 import java.util.Locale;
+import java.util.Optional;
 
-public class InvalidModFileException extends RuntimeException
+public class InvalidModFileException extends ModFileLoadingException
 {
     private final IModFileInfo modFileInfo;
 
     public InvalidModFileException(String message, IModFileInfo modFileInfo)
     {
-        super(String.format(Locale.ENGLISH, "%s (%s)", message, ((ModFileInfo)modFileInfo).getFile().getFileName()));
+        super(String.format(Locale.ROOT, "%s (%s)", message, Optional.ofNullable(modFileInfo).map(mf->mf.getFile().getFileName()).orElse("MISSING FILE NAME")));
         this.modFileInfo = modFileInfo;
     }
+
+    public IModFileInfo getBrokenFile() {
+        return modFileInfo;
+    }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/JarInJarDependencyLocator.java

@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) Forge Development LLC and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.minecraftforge.fml.loading.moddiscovery;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Lists;
+import com.mojang.logging.LogUtils;
+import net.minecraftforge.fml.loading.EarlyLoadingException;
+import net.minecraftforge.forgespi.language.IModInfo;
+import net.minecraftforge.forgespi.locating.IModFile;
+import net.minecraftforge.forgespi.locating.ModFileLoadingException;
+import net.minecraftforge.jarjar.selection.JarSelector;
+import org.apache.maven.artifact.versioning.ArtifactVersion;
+import org.apache.maven.artifact.versioning.VersionRange;
+import org.jetbrains.annotations.NotNull;
+import org.slf4j.Logger;
+
+import java.net.URI;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
+import java.nio.file.Path;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class JarInJarDependencyLocator extends AbstractJarFileDependencyLocator
+{
+    private static final Logger LOGGER = LogUtils.getLogger();
+
+    @Override
+    public String name()
+    {
+        return "JarInJar";
+    }
+
+    @Override
+    public List<IModFile> scanMods(final Iterable<IModFile> loadedMods)
+    {
+        final List<IModFile> sources = Lists.newArrayList();
+        loadedMods.forEach(sources::add);
+
+        final List<IModFile> dependenciesToLoad = JarSelector.detectAndSelect(sources, this::loadResourceFromModFile, this::loadModFileFrom, this::identifyMod, this::exception);
+
+        if (dependenciesToLoad.isEmpty())
+        {
+            LOGGER.info("No dependencies to load found. Skipping!");
+            return Collections.emptyList();
+        }
+
+        LOGGER.info("Found {} dependencies adding them to mods collection", dependenciesToLoad.size());
+        return dependenciesToLoad;
+    }
+
+    @Override
+    public void initArguments(final Map<String, ?> arguments)
+    {
+        // NO-OP, for now
+    }
+
+    @Override
+    protected String getDefaultJarModType()
+    {
+        return IModFile.Type.GAMELIBRARY.name();
+    }
+
+    @SuppressWarnings("resource")
+    @Override
+    protected Optional<IModFile> loadModFileFrom(final IModFile file, final Path path)
+    {
+        try
+        {
+            final Path pathInModFile = file.findResource(path.toString());
+            final URI filePathUri = new URI("jij:" + (pathInModFile.toAbsolutePath().toUri().getRawSchemeSpecificPart())).normalize();
+            final Map<String, ?> outerFsArgs = ImmutableMap.of("packagePath", pathInModFile);
+            final FileSystem zipFS = FileSystems.newFileSystem(filePathUri, outerFsArgs);
+            final Path pathInFS = zipFS.getPath("/");
+            return Optional.of(createMod(pathInFS).file());
+        }
+        catch (Exception e)
+        {
+            LOGGER.error("Failed to load mod file {} from {}", path, file.getFileName());
+            final RuntimeException exception = new ModFileLoadingException("Failed to load mod file " + file.getFileName());
+            exception.initCause(e);
+
+            throw exception;
+        }
+    }
+
+    protected EarlyLoadingException exception(Collection<JarSelector.ResolutionFailureInformation<IModFile>> failedDependencies)
+    {
+
+        final List<EarlyLoadingException.ExceptionData> errors = failedDependencies.stream()
+               .filter(entry -> !entry.sources().isEmpty()) //Should never be the case, but just to be sure
+               .map(this::buildExceptionData)
+               .toList();
+
+        return new EarlyLoadingException(failedDependencies.size() + " Dependency restrictions were not met.", null, errors);
+    }
+
+    @NotNull
+    private EarlyLoadingException.ExceptionData buildExceptionData(final JarSelector.ResolutionFailureInformation<IModFile> entry)
+    {
+        return new EarlyLoadingException.ExceptionData(
+                getErrorTranslationKey(entry),
+                entry.identifier().group() + ":" + entry.identifier().artifact(),
+                entry.sources()
+                     .stream()
+                     .flatMap(this::getModWithVersionRangeStream)
+                     .map(this::formatError)
+                     .collect(Collectors.joining(", "))
+        );
+    }
+
+    @NotNull
+    private String getErrorTranslationKey(final JarSelector.ResolutionFailureInformation<IModFile> entry)
+    {
+        return entry.failureReason() == JarSelector.FailureReason.VERSION_RESOLUTION_FAILED ?
+                       "fml.dependencyloading.conflictingdependencies" :
+                       "fml.dependencyloading.mismatchedcontaineddependencies";
+    }
+
+    @NotNull
+    private Stream<ModWithVersionRange> getModWithVersionRangeStream(final JarSelector.SourceWithRequestedVersionRange<IModFile> file)
+    {
+        return file.sources()
+                   .stream()
+                   .map(IModFile::getModFileInfo)
+                   .flatMap(modFileInfo -> modFileInfo.getMods().stream())
+                   .map(modInfo -> new ModWithVersionRange(modInfo, file.requestedVersionRange(), file.includedVersion()));
+    }
+
+    @NotNull
+    private String formatError(final ModWithVersionRange modWithVersionRange)
+    {
+        return "\u00a7e" + modWithVersionRange.modInfo().getModId() + "\u00a7r - \u00a74" + modWithVersionRange.versionRange().toString() + "\u00a74 - \u00a72" + modWithVersionRange.artifactVersion().toString() + "\u00a72";
+    }
+
+    @Override
+    protected String identifyMod(final IModFile modFile)
+    {
+        if (modFile.getModFileInfo() == null || modFile.getModInfos().isEmpty())
+        {
+            return modFile.getFileName();
+        }
+
+        return modFile.getModInfos().stream().map(IModInfo::getModId).collect(Collectors.joining());
+    }
+
+    private record ModWithVersionRange(IModInfo modInfo, VersionRange versionRange, ArtifactVersion artifactVersion)
+    {}
+}

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/MavenDirectoryLocator.java

@@ -15,7 +15,8 @@ import java.util.Map;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-public class MavenDirectoryLocator extends AbstractJarFileLocator {
+public class MavenDirectoryLocator extends AbstractJarFileModLocator
+{
     private List<Path> modCoords;
 
     @Override

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/MinecraftLocator.java

@@ -12,21 +12,26 @@ import net.minecraftforge.fml.loading.FMLLoader;
 import net.minecraftforge.fml.loading.LogMarkers;
 import net.minecraftforge.forgespi.language.IModFileInfo;
 import net.minecraftforge.forgespi.locating.IModFile;
+import net.minecraftforge.forgespi.locating.IModLocator;
 import net.minecraftforge.forgespi.locating.ModFileFactory;
 import org.slf4j.Logger;
 
 import java.io.IOException;
-import java.nio.file.*;
-import java.util.*;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
 import java.util.function.Consumer;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-public class MinecraftLocator extends AbstractModLocator {
+public class MinecraftLocator extends AbstractModProvider implements IModLocator
+{
     private static final Logger LOGGER = LogUtils.getLogger();
 
     @Override
-    public List<IModFile> scanMods() {
+    public List<IModLocator.ModFileOrException> scanMods() {
         final var launchHandler = FMLLoader.getLaunchHandler();
         var baseMC = launchHandler.getMinecraftPaths();
         var mcjar = ModJarMetadata.buildFile(j->ModFileFactory.FACTORY.build(j, this, this::buildMinecraftTOML), j->true, baseMC.minecraftFilter(), baseMC.minecraftPaths().toArray(Path[]::new)).orElseThrow();
@@ -35,12 +40,11 @@ public class MinecraftLocator extends AbstractModLocator {
                 .map(sj -> new ModFile(sj, this, ModFileParser::modsTomlParser))
                 .collect(Collectors.<IModFile>toList());
         var othermods = baseMC.otherModPaths().stream()
-                .map(p -> createMod(p.toArray(Path[]::new)).orElse(null))
-                .filter(Objects::nonNull)
-                .toList();
+                .map(p -> createMod(p.toArray(Path[]::new)))
+                .filter(Objects::nonNull);
         artifacts.add(mcjar);
-        artifacts.addAll(othermods);
-        return artifacts;
+
+        return Stream.concat(artifacts.stream().map(f -> new ModFileOrException(f, null)), othermods).toList();
     }
 
     private IModFileInfo buildMinecraftTOML(final IModFile iModFile) {

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/ModDiscoverer.java

@@ -5,13 +5,19 @@
 
 package net.minecraftforge.fml.loading.moddiscovery;
 
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Maps;
 import com.mojang.logging.LogUtils;
 import cpw.mods.modlauncher.Launcher;
 import cpw.mods.modlauncher.api.IModuleLayerManager;
 import cpw.mods.modlauncher.util.ServiceLoaderUtils;
+import net.minecraftforge.fml.loading.EarlyLoadingException;
 import net.minecraftforge.fml.loading.LogMarkers;
+import net.minecraftforge.fml.loading.UniqueModListBuilder;
 import net.minecraftforge.fml.loading.progress.StartupMessageManager;
 import net.minecraftforge.forgespi.Environment;
+import net.minecraftforge.forgespi.language.IModFileInfo;
+import net.minecraftforge.forgespi.locating.IDependencyLocator;
 import net.minecraftforge.forgespi.locating.IModFile;
 import net.minecraftforge.forgespi.locating.IModLocator;
 import org.slf4j.Logger;
@@ -19,52 +25,151 @@ import org.slf4j.Logger;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.ServiceLoader;
 import java.util.stream.Collectors;
 
 public class ModDiscoverer {
     private static final Logger LOGGER = LogUtils.getLogger();
-    private final ServiceLoader<IModLocator> locators;
-    private final List<IModLocator> locatorList;
+    private final ServiceLoader<IModLocator> modLocators;
+    private final ServiceLoader<IDependencyLocator> dependencyLocators;
+    private final List<IModLocator>          modLocatorList;
+    private final List<IDependencyLocator>   dependencyLocatorList;
 
     public ModDiscoverer(Map<String, ?> arguments) {
         Launcher.INSTANCE.environment().computePropertyIfAbsent(Environment.Keys.MODDIRECTORYFACTORY.get(), v->ModsFolderLocator::new);
         Launcher.INSTANCE.environment().computePropertyIfAbsent(Environment.Keys.PROGRESSMESSAGE.get(), v-> StartupMessageManager.locatorConsumer().orElseGet(()-> s->{}));
         final var moduleLayerManager = Launcher.INSTANCE.environment().findModuleLayerManager().orElseThrow();
-        locators = ServiceLoader.load(moduleLayerManager.getLayer(IModuleLayerManager.Layer.SERVICE).orElseThrow(), IModLocator.class);
-        locatorList = ServiceLoaderUtils.streamServiceLoader(()->locators, sce->LOGGER.error("Failed to load locator list", sce)).collect(Collectors.toList());
-        locatorList.forEach(l->l.initArguments(arguments));
+        modLocators = ServiceLoader.load(moduleLayerManager.getLayer(IModuleLayerManager.Layer.SERVICE).orElseThrow(), IModLocator.class);
+        dependencyLocators = ServiceLoader.load(moduleLayerManager.getLayer(IModuleLayerManager.Layer.SERVICE).orElseThrow(), IDependencyLocator.class);
+        modLocatorList = ServiceLoaderUtils.streamServiceLoader(()-> modLocators, sce->LOGGER.error("Failed to load mod locator list", sce)).collect(Collectors.toList());
+        modLocatorList.forEach(l->l.initArguments(arguments));
+        dependencyLocatorList = ServiceLoaderUtils.streamServiceLoader(()-> dependencyLocators, sce->LOGGER.error("Failed to load dependency locator list", sce)).collect(Collectors.toList());
+        dependencyLocatorList.forEach(l->l.initArguments(arguments));
         if (LOGGER.isDebugEnabled(LogMarkers.CORE))
         {
-            LOGGER.debug(LogMarkers.CORE, "Found Mod Locators : {}", locatorList.stream()
-                    .map(iModLocator -> "(" + iModLocator.name() + ":" + iModLocator.getClass().getPackage().getImplementationVersion() + ")").collect(Collectors.joining(",")));
+            LOGGER.debug(LogMarkers.CORE, "Found Mod Locators : {}", modLocatorList.stream()
+                                                                       .map(modLocator -> "(%s:%s)".formatted(modLocator.name(),
+                                                                         modLocator.getClass().getPackage().getImplementationVersion())).collect(Collectors.joining(",")));
+        }
+        if (LOGGER.isDebugEnabled(LogMarkers.CORE))
+        {
+            LOGGER.debug(LogMarkers.CORE, "Found Dependency Locators : {}", dependencyLocatorList.stream()
+                                                                       .map(dependencyLocator -> "(%s:%s)".formatted(dependencyLocator.name(),
+                                                                         dependencyLocator.getClass().getPackage().getImplementationVersion())).collect(Collectors.joining(",")));
         }
-    }
-
-    ModDiscoverer(List<IModLocator> locatorList) {
-        this.locatorList = locatorList;
-        this.locators = null;
     }
 
     public ModValidator discoverMods() {
-        LOGGER.debug(LogMarkers.SCAN,"Scanning for mods and other resources to load. We know {} ways to find mods", locatorList.size());
-        var loadedFiles = new ArrayList<>();
-        for (IModLocator locator : locatorList) {
-            LOGGER.debug(LogMarkers.SCAN,"Trying locator {}", locator);
-            var modFiles = locator.scanMods();
-            for (IModFile mf : modFiles) {
-                LOGGER.info(LogMarkers.SCAN, "Found mod file {} of type {} with locator {}", mf.getFileName(), mf.getType(), mf.getLocator());
-                StartupMessageManager.modLoaderConsumer().ifPresent(c->c.accept("Found mod file "+mf.getFileName()+" of type "+mf.getType()));
-            }
-            loadedFiles.addAll(modFiles);
-        }
-        final var modFilesMap = loadedFiles.stream()
-                .map(ModFile.class::cast)
-                .collect(Collectors.groupingBy(IModFile::getType));
+        LOGGER.debug(LogMarkers.SCAN,"Scanning for mods and other resources to load. We know {} ways to find mods", modLocatorList.size());
+        List<ModFile> loadedFiles = new ArrayList<>();
+        List<EarlyLoadingException.ExceptionData> discoveryErrorData = new ArrayList<>();
+        boolean successfullyLoadedMods = true;
+        List<IModFileInfo> brokenFiles = new ArrayList<>();
 
-        var validator = new ModValidator(modFilesMap);
+        //Loop all mod locators to get the prime mods to load from.
+        for (IModLocator locator : modLocatorList) {
+            try {
+                LOGGER.debug(LogMarkers.SCAN, "Trying locator {}", locator);
+                var candidates = locator.scanMods();
+                LOGGER.debug(LogMarkers.SCAN, "Locator {} found {} candidates or errors", locator, candidates.size());
+                var exceptions = candidates.stream().map(IModLocator.ModFileOrException::ex).filter(Objects::nonNull).toList();
+                if (!exceptions.isEmpty()) {
+                    LOGGER.debug(LogMarkers.SCAN, "Locator {} found {} invalid mod files", locator, exceptions.size());
+                    brokenFiles.addAll(exceptions.stream().map(e->e instanceof InvalidModFileException ime ? ime.getBrokenFile() : null).filter(Objects::nonNull).toList());
+                }
+                var locatedFiles = candidates.stream().map(IModLocator.ModFileOrException::file).filter(Objects::nonNull).collect(Collectors.toList());
+
+                var badModFiles = locatedFiles.stream().filter(file -> !(file instanceof ModFile)).toList();
+                if (!badModFiles.isEmpty()) {
+                    LOGGER.error(LogMarkers.SCAN, "Locator {} returned {} files which is are not ModFile instances! They will be skipped!", locator, badModFiles.size());
+                    brokenFiles.addAll(badModFiles.stream().map(IModFile::getModFileInfo).toList());
+                }
+                locatedFiles.removeAll(badModFiles);
+                LOGGER.debug(LogMarkers.SCAN, "Locator {} found {} valid mod files", locator, locatedFiles.size());
+                handleLocatedFiles(loadedFiles, locatedFiles);
+            } catch (InvalidModFileException imfe) {
+                // We don't generally expect this exception, since it should come from the candidates stream above and be handled in the Locator, but just in case.
+                LOGGER.error(LogMarkers.SCAN, "Locator {} found an invalid mod file {}", locator, imfe.getBrokenFile(), imfe);
+                brokenFiles.add(imfe.getBrokenFile());
+            } catch (EarlyLoadingException exception) {
+                LOGGER.error(LogMarkers.SCAN, "Failed to load mods with locator {}", locator, exception);
+                discoveryErrorData.addAll(exception.getAllData());
+            }
+        }
+
+        //First processing run of the mod list. Any duplicates will cause resolution failure and dependency loading will be skipped.
+        Map<IModFile.Type, List<ModFile>> modFilesMap = Maps.newHashMap();
+        try {
+            final UniqueModListBuilder modsUniqueListBuilder = new UniqueModListBuilder(loadedFiles);
+            final UniqueModListBuilder.UniqueModListData uniqueModsData = modsUniqueListBuilder.buildUniqueList();
+
+            //Grab the temporary results.
+            //This allows loading to continue to a base state, in case dependency loading fails.
+            modFilesMap = uniqueModsData.modFiles().stream()
+                            .collect(Collectors.groupingBy(IModFile::getType));
+            loadedFiles = uniqueModsData.modFiles();
+        }
+        catch (EarlyLoadingException exception) {
+            LOGGER.error(LogMarkers.SCAN, "Failed to build unique mod list after mod discovery.", exception);
+            discoveryErrorData.addAll(exception.getAllData());
+            successfullyLoadedMods = false;
+        }
+
+        //We can continue loading if prime mods loaded successfully.
+        if (successfullyLoadedMods) {
+            LOGGER.debug(LogMarkers.SCAN, "Successfully Loaded {} mods. Attempting to load dependencies...", loadedFiles.size());
+            for (IDependencyLocator locator : dependencyLocatorList) {
+                try {
+                    LOGGER.debug(LogMarkers.SCAN,"Trying locator {}", locator);
+                    final List<IModFile> locatedMods = ImmutableList.copyOf(loadedFiles);
+
+                    var locatedFiles = locator.scanMods(locatedMods);
+                    if (locatedFiles.stream().anyMatch(file -> !(file instanceof ModFile))) {
+                        LOGGER.error(LogMarkers.SCAN, "A dependency locator returned a file which is not a ModFile instance!. They will be skipped!");
+                    }
+
+                    handleLocatedFiles(loadedFiles, locatedFiles);
+                }
+                catch (EarlyLoadingException exception) {
+                    LOGGER.error(LogMarkers.SCAN, "Failed to load dependencies with locator {}", locator, exception);
+                    discoveryErrorData.addAll(exception.getAllData());
+                }
+            }
+
+            //Second processing run of the mod list. Any duplicates will cause resolution failure and only the mods list will be loaded.
+            try {
+                final UniqueModListBuilder modsAndDependenciesUniqueListBuilder = new UniqueModListBuilder(loadedFiles);
+                final UniqueModListBuilder.UniqueModListData uniqueModsAndDependenciesData = modsAndDependenciesUniqueListBuilder.buildUniqueList();
+
+                //We now only need the mod files map, not the list.
+                modFilesMap = uniqueModsAndDependenciesData.modFiles().stream()
+                                .collect(Collectors.groupingBy(IModFile::getType));
+            } catch (EarlyLoadingException exception) {
+                LOGGER.error(LogMarkers.SCAN, "Failed to build unique mod list after dependency discovery.", exception);
+                discoveryErrorData.addAll(exception.getAllData());
+                modFilesMap = loadedFiles.stream().collect(Collectors.groupingBy(IModFile::getType));
+            }
+        }
+        else {
+            //Failure notify the listeners.
+            LOGGER.error(LogMarkers.SCAN, "Mod Discovery failed. Skipping dependency discovery.");
+        }
+
+        //Validate the loading. With a deduplicated list, we can now successfully process the artifacts and load
+        //transformer plugins.
+        var validator = new ModValidator(modFilesMap, brokenFiles, discoveryErrorData);
         validator.stage1Validation();
         return validator;
     }
 
+    private void handleLocatedFiles(final List<ModFile> loadedFiles, final List<IModFile> locatedFiles)
+    {
+        var locatedModFiles = locatedFiles.stream().filter(ModFile.class::isInstance).map(ModFile.class::cast).toList();
+        for (IModFile mf : locatedModFiles) {
+            LOGGER.info(LogMarkers.SCAN, "Found mod file {} of type {} with provider {}", mf.getFileName(), mf.getType(), mf.getProvider());
+            StartupMessageManager.modLoaderConsumer().ifPresent(c->c.accept("Found mod file "+mf.getFileName()+" of type "+mf.getType()));
+        }
+        loadedFiles.addAll(locatedModFiles);
+    }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/ModFile.java

@@ -16,8 +16,10 @@ import net.minecraftforge.forgespi.language.IModInfo;
 import net.minecraftforge.forgespi.language.IModLanguageProvider;
 import net.minecraftforge.forgespi.language.ModFileScanData;
 import net.minecraftforge.forgespi.locating.IModFile;
-import net.minecraftforge.forgespi.locating.IModLocator;
+import net.minecraftforge.forgespi.locating.IModProvider;
 import net.minecraftforge.forgespi.locating.ModFileFactory;
+import org.apache.maven.artifact.versioning.ArtifactVersion;
+import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
 import org.slf4j.Logger;
 
 import java.nio.file.Files;
@@ -51,9 +53,9 @@ public class ModFile implements IModFile {
     private Throwable scanError;
     private final SecureJar jar;
     private final Type modFileType;
-    private final Manifest manifest;
-    private final IModLocator locator;
-    private IModFileInfo modFileInfo;
+    private final Manifest     manifest;
+    private final IModProvider provider;
+    private       IModFileInfo modFileInfo;
     private ModFileScanData fileModFileScanData;
     private CompletableFuture<ModFileScanData> futureScanResult;
     private List<CoreModFile> coreMods;
@@ -62,15 +64,19 @@ public class ModFile implements IModFile {
     static final Attributes.Name TYPE = new Attributes.Name("FMLModType");
     private SecureJar.Status securityStatus;
 
-    public ModFile(final SecureJar jar, final IModLocator locator, final ModFileFactory.ModFileInfoParser parser) {
-        this.locator = locator;
+    public ModFile(final SecureJar jar, final IModProvider provider, final ModFileFactory.ModFileInfoParser parser) {
+        this(jar, provider, parser, parseType(jar));
+    }
+
+    public ModFile(final SecureJar jar, final IModProvider provider, final ModFileFactory.ModFileInfoParser parser, String type) {
+        this.provider = provider;
         this.jar = jar;
         this.parser = parser;
 
-        manifest = this.jar.getManifest();
-        final Optional<String> value = Optional.ofNullable(manifest.getMainAttributes().getValue(TYPE));
-        modFileType = Type.valueOf(value.orElse("MOD"));
+        manifest = this.jar.moduleDataProvider().getManifest();
+        modFileType = Type.valueOf(type);
         jarVersion = Optional.ofNullable(manifest.getMainAttributes().getValue(Attributes.Name.IMPLEMENTATION_VERSION)).orElse("0.0NONE");
+        this.modFileInfo = ModFileParser.readModList(this, this.parser);
     }
 
     @Override
@@ -123,7 +129,7 @@ public class ModFile implements IModFile {
     }
 
     public void scanFile(Consumer<Path> pathConsumer) {
-        locator.scanFile(this, pathConsumer);
+        provider.scanFile(this, pathConsumer);
     }
 
     public void setFutureScanResult(CompletableFuture<ModFileScanData> future) {
@@ -188,8 +194,8 @@ public class ModFile implements IModFile {
     }
 
     @Override
-    public IModLocator getLocator() {
-        return locator;
+    public IModProvider getProvider() {
+        return provider;
     }
 
     @Override
@@ -201,4 +207,15 @@ public class ModFile implements IModFile {
     public void setSecurityStatus(final SecureJar.Status status) {
         this.securityStatus = status;
     }
+
+    public ArtifactVersion getJarVersion()
+    {
+        return new DefaultArtifactVersion(this.jarVersion);
+    }
+
+    private static String parseType(final SecureJar jar) {
+        final Manifest m = jar.moduleDataProvider().getManifest();
+        final Optional<String> value = Optional.ofNullable(m.getMainAttributes().getValue(TYPE));
+        return value.orElse("MOD");
+    }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/ModInfo.java

@@ -11,12 +11,11 @@ import net.minecraftforge.fml.loading.StringUtils;
 import net.minecraftforge.forgespi.language.IConfigurable;
 import net.minecraftforge.forgespi.language.IModInfo;
 import net.minecraftforge.forgespi.language.MavenVersionAdapter;
+import net.minecraftforge.forgespi.locating.ForgeFeature;
 import org.apache.maven.artifact.versioning.ArtifactVersion;
 import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
 import org.apache.maven.artifact.versioning.VersionRange;
 import org.slf4j.Logger;
-import org.slf4j.Marker;
-import org.slf4j.MarkerFactory;
 
 import java.net.URL;
 import java.util.Collections;
@@ -32,6 +31,7 @@ public class ModInfo implements IModInfo, IConfigurable
     private static final DefaultArtifactVersion DEFAULT_VERSION = new DefaultArtifactVersion("1");
     private static final Pattern VALID_MODID = Pattern.compile("^[a-z][a-z0-9_]{1,63}$");
     private static final Pattern VALID_NAMESPACE = Pattern.compile("^[a-z][a-z0-9_.-]{1,63}$");
+    private static final Pattern VALID_VERSION = Pattern.compile("^\\d+.*");
 
     private final ModFileInfo owningFile;
     private final String modId;
@@ -43,8 +43,11 @@ public class ModInfo implements IModInfo, IConfigurable
     private final boolean logoBlur;
     private final Optional<URL> updateJSONURL;
     private final List<? extends IModInfo.ModVersion> dependencies;
+
+    private final List<ForgeFeature.Bound> features;
     private final Map<String,Object> properties;
     private final IConfigurable config;
+    private final Optional<URL> modUrl;
 
     public ModInfo(final ModFileInfo owningFile, final IConfigurable config)
     {
@@ -83,9 +86,23 @@ public class ModInfo implements IModInfo, IConfigurable
                 .collect(Collectors.toList()))
                 .orElse(Collections.emptyList());
 
+        this.features = ownFile.map(mfi -> mfi.<Map<String, String>>getConfigElement("features", this.modId)
+                .stream()
+                .flatMap(m->m.entrySet().stream())
+                .map(e->new ForgeFeature.Bound(e.getKey(), e.getValue(), this))
+                .collect(Collectors.toList())).orElse(Collections.emptyList());
+
         this.properties = ownFile.map(mfi -> mfi.<Map<String, Object>>getConfigElement("modproperties", this.modId)
                 .orElse(Collections.emptyMap()))
                 .orElse(Collections.emptyMap());
+
+        this.modUrl = config.<String>getConfigElement("modUrl")
+                .map(StringUtils::toURL);
+
+        // verify we have a valid mod version otherwise throw an exception
+        if (!VALID_VERSION.matcher(this.version.toString()).matches()) {
+            throw new InvalidModFileException("Illegal version number specified "+this.version, this.getOwningFile());
+        }
     }
 
     @Override
@@ -152,6 +169,11 @@ public class ModInfo implements IModInfo, IConfigurable
         return this;
     }
 
+    @Override
+    public List<? extends ForgeFeature.Bound> getForgeFeatures() {
+        return this.features;
+    }
+
     @Override
     public <T> Optional<T> getConfigElement(final String... key) {
         return this.config.getConfigElement(key);
@@ -162,6 +184,11 @@ public class ModInfo implements IModInfo, IConfigurable
         return null;
     }
 
+    @Override
+    public Optional<URL> getModURL() {
+        return modUrl;
+    }
+
     class ModVersion implements net.minecraftforge.forgespi.language.IModInfo.ModVersion {
         private IModInfo owner;
         private final String modId;
@@ -169,6 +196,7 @@ public class ModInfo implements IModInfo, IConfigurable
         private final boolean mandatory;
         private final Ordering ordering;
         private final DependencySide side;
+        private Optional<URL> referralUrl;
 
         public ModVersion(final IModInfo owner, final IConfigurable config) {
             this.owner = owner;
@@ -185,6 +213,8 @@ public class ModInfo implements IModInfo, IConfigurable
             this.side = config.<String>getConfigElement("side")
                     .map(DependencySide::valueOf)
                     .orElse(DependencySide.BOTH);
+            this.referralUrl = config.<String>getConfigElement("referralUrl")
+                    .map(StringUtils::toURL);
         }
 
 
@@ -229,6 +259,11 @@ public class ModInfo implements IModInfo, IConfigurable
         {
             return owner;
         }
+
+        @Override
+        public Optional<URL> getReferralURL() {
+            return referralUrl;
+        }
     }
 
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/ModValidator.java

@@ -13,11 +13,16 @@ import net.minecraftforge.fml.loading.LoadingModList;
 import net.minecraftforge.fml.loading.LogMarkers;
 import net.minecraftforge.fml.loading.ModSorter;
 import net.minecraftforge.fml.loading.progress.StartupMessageManager;
+import net.minecraftforge.forgespi.language.IModFileInfo;
 import net.minecraftforge.forgespi.locating.IModFile;
 import org.jetbrains.annotations.NotNull;
 import org.slf4j.Logger;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
 
 public class ModValidator {
     private static final Logger LOGGER = LogUtils.getLogger();
@@ -25,14 +30,17 @@ public class ModValidator {
     private final List<ModFile> candidatePlugins;
     private final List<ModFile> candidateMods;
     private LoadingModList loadingModList;
-    private List<ModFile> brokenFiles;
+    private List<IModFile> brokenFiles;
+    private final List<EarlyLoadingException.ExceptionData> discoveryErrorData;
 
-    public ModValidator(final Map<IModFile.Type, List<ModFile>> modFiles) {
+    public ModValidator(final Map<IModFile.Type, List<ModFile>> modFiles, final List<IModFileInfo> brokenFiles, final List<EarlyLoadingException.ExceptionData> discoveryErrorData) {
         this.modFiles = modFiles;
         this.candidateMods = lst(modFiles.get(IModFile.Type.MOD));
         this.candidateMods.addAll(lst(modFiles.get(IModFile.Type.GAMELIBRARY)));
         this.candidatePlugins = lst(modFiles.get(IModFile.Type.LANGPROVIDER));
         this.candidatePlugins.addAll(lst(modFiles.get(IModFile.Type.LIBRARY)));
+        this.discoveryErrorData = discoveryErrorData;
+        this.brokenFiles = brokenFiles.stream().map(IModFileInfo::getFile).collect(Collectors.toList()); // mutable list
     }
 
     private static List<ModFile> lst(List<ModFile> files) {
@@ -40,7 +48,7 @@ public class ModValidator {
     }
 
     public void stage1Validation() {
-        brokenFiles = validateFiles(candidateMods);
+        brokenFiles.addAll(validateFiles(candidateMods));
         if (LOGGER.isDebugEnabled(LogMarkers.SCAN)) {
             LOGGER.debug(LogMarkers.SCAN, "Found {} mod files with {} mods", candidateMods.size(), candidateMods.stream().mapToInt(mf -> mf.getModInfos().size()).sum());
         }
@@ -52,22 +60,22 @@ public class ModValidator {
         final List<ModFile> brokenFiles = new ArrayList<>();
         for (Iterator<ModFile> iterator = mods.iterator(); iterator.hasNext(); )
         {
-            ModFile mod = iterator.next();
-            if (!mod.getLocator().isValid(mod) || !mod.identifyMods()) {
-                LOGGER.warn(LogMarkers.SCAN, "File {} has been ignored - it is invalid", mod.getFilePath());
+            ModFile modFile = iterator.next();
+            if (!modFile.getProvider().isValid(modFile) || !modFile.identifyMods()) {
+                LOGGER.warn(LogMarkers.SCAN, "File {} has been ignored - it is invalid", modFile.getFilePath());
                 iterator.remove();
-                brokenFiles.add(mod);
+                brokenFiles.add(modFile);
             }
         }
         return brokenFiles;
     }
 
     public ITransformationService.Resource getPluginResources() {
-        return new ITransformationService.Resource(IModuleLayerManager.Layer.PLUGIN, this.candidatePlugins.stream().map(ModFile::getSecureJar).toList());
+        return new ITransformationService.Resource(IModuleLayerManager.Layer.PLUGIN, this.candidatePlugins.stream().map(IModFile::getSecureJar).toList());
     }
 
     public ITransformationService.Resource getModResources() {
-        return new ITransformationService.Resource(IModuleLayerManager.Layer.GAME, this.candidateMods.stream().map(ModFile::getSecureJar).toList());
+        return new ITransformationService.Resource(IModuleLayerManager.Layer.GAME, this.candidateMods.stream().map(IModFile::getSecureJar).toList());
     }
 
     private List<EarlyLoadingException.ExceptionData> validateLanguages() {
@@ -86,7 +94,11 @@ public class ModValidator {
 
     public BackgroundScanHandler stage2Validation() {
         var errors = validateLanguages();
-        loadingModList = ModSorter.sort(candidateMods, errors);
+
+        var allErrors = new ArrayList<>(errors);
+        allErrors.addAll(this.discoveryErrorData);
+
+        loadingModList = ModSorter.sort(candidateMods, allErrors);
         loadingModList.addCoreMods();
         loadingModList.addAccessTransformers();
         loadingModList.setBrokenFiles(brokenFiles);

fmlloader/src/main/java/net/minecraftforge/fml/loading/moddiscovery/ModsFolderLocator.java

@@ -23,7 +23,8 @@ import static cpw.mods.modlauncher.api.LamdbaExceptionUtils.uncheck;
 /**
  * Support loading mods located in JAR files in the mods folder
  */
-public class ModsFolderLocator extends AbstractJarFileLocator {
+public class ModsFolderLocator extends AbstractJarFileModLocator
+{
     private static final String SUFFIX = ".jar";
     private static final Logger LOGGER = LogUtils.getLogger();
     private final Path modFolder;

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/CommonClientLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.fml.loading.FMLLoader;
 import net.minecraftforge.fml.loading.LibraryFinder;
 import net.minecraftforge.fml.loading.VersionInfo;
@@ -21,10 +22,9 @@ public abstract class CommonClientLaunchHandler extends CommonLaunchHandler {
     @Override public boolean isProduction() { return true; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             Class.forName(layer.findModule("minecraft").orElseThrow(),"net.minecraft.client.main.Main").getMethod("main", String[].class).invoke(null, (Object)arguments);
-            return null;
         };
     }
 

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/CommonDevLaunchHandler.java

@@ -5,8 +5,8 @@
 
 package net.minecraftforge.fml.loading.targets;
 
-import com.google.common.base.Strings;
 import cpw.mods.jarhandling.SecureJar;
+import net.minecraftforge.fml.loading.FileUtils;
 
 import java.io.File;
 import java.nio.file.Path;
@@ -30,8 +30,7 @@ public abstract class CommonDevLaunchHandler extends CommonLaunchHandler {
 
         // The extra jar is on the classpath, so try and pull it out of the legacy classpath
         var legacyCP = Objects.requireNonNull(System.getProperty("legacyClassPath"), "Missing legacyClassPath, cannot find client-extra").split(File.pathSeparator);
-        var extra = Paths.get(Arrays.stream(legacyCP).filter(e -> e.contains("client-extra")).findFirst().orElseThrow(() -> new IllegalStateException("Could not find client-extra in legacy classpath")));
-        mcstream.add(extra);
+        var extra = findJarOnClasspath(legacyCP, "client-extra");
 
         // The MC code/Patcher edits are in exploded directories
         final var modstream = Stream.<List<Path>>builder();
@@ -42,6 +41,7 @@ public abstract class CommonDevLaunchHandler extends CommonLaunchHandler {
         minecraft.stream().distinct().forEach(mcstream::add);
         mods.values().forEach(modstream::add);
 
+        mcstream.add(extra);
         var mcFilter = getMcFilter(extra, minecraft, modstream);
         return new LocatedPaths(mcstream.build().toList(), mcFilter, modstream.build().toList(), getFmlStuff(legacyCP));
     }
@@ -50,8 +50,6 @@ public abstract class CommonDevLaunchHandler extends CommonLaunchHandler {
         if (getDist().isDedicatedServer())
             return arguments;
 
-        fixNatives();
-
         if (isData())
             return arguments;
 
@@ -80,11 +78,18 @@ public abstract class CommonDevLaunchHandler extends CommonLaunchHandler {
     protected List<Path> getFmlStuff(String[] classpath) {
         // We also want the FML things, fmlcore, javafmllanguage, mclanguage, I don't like hard coding these, but hey whatever works for now.
         return Arrays.stream(classpath)
-            .filter(e -> e.contains("fmlcore") || e.contains("javafmllanguage") || e.contains("lowcodelanguage") || e.contains("mclanguage"))
+            .filter(e -> FileUtils.matchFileName(e, "fmlcore", "javafmllanguage", "lowcodelanguage", "mclanguage"))
             .map(Paths::get)
             .toList();
     }
 
+    protected static Path findJarOnClasspath(String[] classpath, String match) {
+        return Paths.get(Arrays.stream(classpath)
+            .filter(e -> FileUtils.matchFileName(e, match))
+            .findFirst()
+            .orElseThrow(() -> new IllegalStateException("Could not find " + match + " in classpath")));
+    }
+
     protected BiPredicate<String, String> getMcFilter(Path extra, List<Path> minecraft, Stream.Builder<List<Path>> mods) {
         final var packages = getPackages();
         final var extraPath = extra.toString().replace('\\', '/');
@@ -119,18 +124,4 @@ public abstract class CommonDevLaunchHandler extends CommonLaunchHandler {
         // Generate a time-based random number, to mimic how n.m.client.Main works
         return Long.toString(System.nanoTime() % (int) Math.pow(10, length));
     }
-
-    private static void fixNatives() {
-        String paths = System.getProperty("java.library.path");
-        String nativesDir = System.getProperty("nativesDirectory");
-        if (nativesDir == null)
-            return;
-
-        if (Strings.isNullOrEmpty(paths))
-            paths = nativesDir;
-        else
-            paths += File.pathSeparator + nativesDir;
-
-        System.setProperty("java.library.path", paths);
-    }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/CommonServerLaunchHandler.java

@@ -6,6 +6,7 @@
 package net.minecraftforge.fml.loading.targets;
 
 import cpw.mods.jarhandling.SecureJar;
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.fml.loading.FMLLoader;
 import net.minecraftforge.fml.loading.LibraryFinder;
 import net.minecraftforge.fml.loading.VersionInfo;
@@ -23,10 +24,9 @@ public abstract class CommonServerLaunchHandler extends CommonLaunchHandler {
     @Override public boolean isProduction() { return true; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             Class.forName(layer.findModule("minecraft").orElseThrow(),"net.minecraft.server.Main").getMethod("main", String[].class).invoke(null, (Object)arguments);
-            return null;
         };
     }
 

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/CommonUserdevLaunchHandler.java

@@ -10,8 +10,6 @@ import net.minecraftforge.fml.loading.VersionInfo;
 
 import java.io.File;
 import java.nio.file.Path;
-import java.nio.file.Paths;
-import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
 import java.util.stream.Collectors;
@@ -41,8 +39,4 @@ public abstract class CommonUserdevLaunchHandler extends CommonDevLaunchHandler
     }
 
     protected abstract void processStreams(String[] classpath, VersionInfo versionInfo, Stream.Builder<Path> mc, Stream.Builder<List<Path>> mods);
-
-    protected static Path findJarOnClasspath(String[] classpath, String match) {
-        return Paths.get(Arrays.stream(classpath).filter(e -> e.contains(match)).findFirst().orElseThrow(() -> new IllegalStateException("Could not find " + match + " in classpath")));
-    }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/FMLClientDevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 import java.util.concurrent.Callable;
 
@@ -13,12 +14,11 @@ public class FMLClientDevLaunchHandler extends CommonDevLaunchHandler {
     @Override public Dist getDist() { return Dist.CLIENT; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(), "net.minecraft.client.main.Main").getMethod("main", String[].class).invoke(null, (Object) args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/FMLClientUserdevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 
 import java.util.concurrent.Callable;
@@ -17,12 +18,11 @@ public class FMLClientUserdevLaunchHandler extends FMLUserdevLaunchHandler {
     public Dist getDist() { return Dist.CLIENT; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(), "net.minecraft.client.main.Main").getMethod("main", String[].class).invoke(null, (Object) args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/FMLDataUserdevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 
 import java.util.concurrent.Callable;
@@ -20,12 +21,11 @@ public class FMLDataUserdevLaunchHandler extends FMLUserdevLaunchHandler {
     public boolean isData() { return true; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(), "net.minecraft.data.Main").getMethod("main", String[].class).invoke(null, (Object) args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/FMLServerDevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 import java.util.concurrent.Callable;
 
@@ -13,12 +14,11 @@ public class FMLServerDevLaunchHandler extends CommonDevLaunchHandler {
     @Override public Dist getDist() { return Dist.DEDICATED_SERVER; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(),"net.minecraft.server.Main").getMethod("main", String[].class).invoke(null, (Object)args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/FMLServerUserdevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 
 import java.util.concurrent.Callable;
@@ -14,12 +15,11 @@ public class FMLServerUserdevLaunchHandler extends FMLUserdevLaunchHandler {
     @Override public Dist getDist() { return Dist.DEDICATED_SERVER; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(),"net.minecraft.server.Main").getMethod("main", String[].class).invoke(null, (Object)args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/ForgeClientDevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 import java.util.concurrent.Callable;
 
@@ -13,12 +14,11 @@ public class ForgeClientDevLaunchHandler extends CommonDevLaunchHandler {
     @Override public Dist getDist() { return Dist.CLIENT; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(), "net.minecraft.client.main.Main").getMethod("main", String[].class).invoke(null, (Object) args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/ForgeClientUserdevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 
 import java.util.concurrent.Callable;
@@ -17,12 +18,11 @@ public class ForgeClientUserdevLaunchHandler extends ForgeUserdevLaunchHandler {
     public Dist getDist() { return Dist.CLIENT; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(), "net.minecraft.client.main.Main").getMethod("main", String[].class).invoke(null, (Object) args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/ForgeDataDevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 
 import java.util.concurrent.Callable;
@@ -15,12 +16,11 @@ public class ForgeDataDevLaunchHandler extends CommonDevLaunchHandler {
     @Override public boolean isData() { return true; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(), "net.minecraft.data.Main").getMethod("main", String[].class).invoke(null, (Object) args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/ForgeDataUserdevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 
 import java.util.concurrent.Callable;
@@ -20,12 +21,11 @@ public class ForgeDataUserdevLaunchHandler extends ForgeUserdevLaunchHandler {
     public boolean isData() { return true; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(), "net.minecraft.data.Main").getMethod("main", String[].class).invoke(null, (Object) args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/ForgeGametestDevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 
 import java.util.concurrent.Callable;
@@ -14,12 +15,11 @@ public class ForgeGametestDevLaunchHandler extends CommonDevLaunchHandler {
     @Override public Dist getDist() { return Dist.DEDICATED_SERVER; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("forge").orElseThrow(), "net.minecraftforge.gametest.GameTestMain").getMethod("main", String[].class).invoke(null, (Object)args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/ForgeGametestUserdevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 
 import java.util.concurrent.Callable;
@@ -14,12 +15,11 @@ public class ForgeGametestUserdevLaunchHandler extends ForgeUserdevLaunchHandler
     @Override public Dist getDist() { return Dist.DEDICATED_SERVER; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("forge").orElseThrow(), "net.minecraftforge.gametest.GameTestMain").getMethod("main", String[].class).invoke(null, (Object)args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/ForgeServerDevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 import java.util.concurrent.Callable;
 
@@ -13,12 +14,11 @@ public class ForgeServerDevLaunchHandler extends CommonDevLaunchHandler {
     @Override public Dist getDist() { return Dist.DEDICATED_SERVER; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(),"net.minecraft.server.Main").getMethod("main", String[].class).invoke(null, (Object)args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/targets/ForgeServerUserdevLaunchHandler.java

@@ -5,6 +5,7 @@
 
 package net.minecraftforge.fml.loading.targets;
 
+import cpw.mods.modlauncher.api.ServiceRunner;
 import net.minecraftforge.api.distmarker.Dist;
 
 import java.util.concurrent.Callable;
@@ -14,12 +15,11 @@ public class ForgeServerUserdevLaunchHandler extends ForgeUserdevLaunchHandler {
     @Override public Dist getDist() { return Dist.DEDICATED_SERVER; }
 
     @Override
-    public Callable<Void> launchService(String[] arguments, ModuleLayer layer) {
+    public ServiceRunner launchService(String[] arguments, ModuleLayer layer) {
         return () -> {
             var args = preLaunch(arguments, layer);
 
             Class.forName(layer.findModule("minecraft").orElseThrow(),"net.minecraft.server.Main").getMethod("main", String[].class).invoke(null, (Object)args);
-            return null;
         };
     }
 }

fmlloader/src/main/java/net/minecraftforge/fml/loading/toposort/CyclePresentException.java

@@ -19,6 +19,7 @@ public final class CyclePresentException extends IllegalArgumentException {
      * @param cycles the cycles present
      */
     CyclePresentException(Set<Set<?>> cycles) {
+        super("Cycles present in graph: " + cycles);
         this.cycles = cycles;
     }
 

fmlloader/src/main/resources/META-INF/defaultfmlconfig.toml

@@ -4,3 +4,5 @@ splashscreen = true
 maxThreads = -1
 # Enable forge global version checking
 versionCheck = true
+# Disables Optimized DFU client-side.
+disableOptimizedDFU = true

fmlloader/src/main/resources/META-INF/services/cpw.mods.modlauncher.serviceapi.ITransformerDiscoveryService

@@ -1 +1,2 @@
-net.minecraftforge.fml.loading.ModDirTransformerDiscoverer
+net.minecraftforge.fml.loading.ModDirTransformerDiscoverer
+net.minecraftforge.fml.loading.ClasspathTransformerDiscoverer

fmlloader/src/main/resources/META-INF/services/net.minecraftforge.forgespi.locating.IDependencyLocator

@@ -0,0 +1 @@
+net.minecraftforge.fml.loading.moddiscovery.JarInJarDependencyLocator

fmlloader/src/main/resources/log4j2.xml

@@ -13,6 +13,7 @@
         <MarkerFilter marker="REGISTRIES" onMatch="${sys:forge.logging.marker.registries:-DENY}" onMismatch="NEUTRAL"/>
         <MarkerFilter marker="REGISTRYDUMP" onMatch="${sys:forge.logging.marker.registrydump:-DENY}" onMismatch="NEUTRAL"/>
         <MarkerFilter marker="SPLASH" onMatch="${sys:forge.logging.marker.splash:-DENY}" onMismatch="NEUTRAL"/>
+        <MarkerFilter marker="RESOURCE-CACHE" onMatch="${sys:forge.logging.marker.resource.cache:-DENY}" onMismatch="NEUTRAL"/>
         <MarkerFilter marker="FORGEMOD" onMatch="${sys:forge.logging.marker.forgemod:-ACCEPT}" onMismatch="NEUTRAL"/>
         <MarkerFilter marker="LOADING" onMatch="${sys:forge.logging.marker.loading:-ACCEPT}" onMismatch="NEUTRAL"/>
         <MarkerFilter marker="CORE" onMatch="${sys:forge.logging.marker.core:-ACCEPT}" onMismatch="NEUTRAL"/>

fmlonly/src/main/java/net/minecraftforge/fmlonly/FMLOnlyBindings.java

@@ -42,6 +42,6 @@ public class FMLOnlyBindings implements IBindingsProvider {
 
     @Override
     public Supplier<IConfigEvent.ConfigConfig> getConfigConfiguration() {
-        return ()->new IConfigEvent.ConfigConfig(ModConfigEvent.Loading::new, ModConfigEvent.Reloading::new);
+        return ()->new IConfigEvent.ConfigConfig(ModConfigEvent.Loading::new, ModConfigEvent.Reloading::new, ModConfigEvent.Unloading::new);
     }
 }