Fix NPE

HMCL/src/main/java/org/jackhuang/hmcl/Launcher.java

@@ -20,6 +20,9 @@ package org.jackhuang.hmcl;
 import javafx.application.Application;
 import javafx.application.Platform;
 import javafx.stage.Stage;
+import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorServer;
+import org.jackhuang.hmcl.setting.Accounts;
+import org.jackhuang.hmcl.setting.AuthlibInjectorServers;
 import org.jackhuang.hmcl.setting.ConfigHolder;
 import org.jackhuang.hmcl.task.Schedulers;
 import org.jackhuang.hmcl.task.TaskExecutor;
@@ -41,6 +44,7 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 
+import static org.jackhuang.hmcl.setting.ConfigHolder.config;
 import static org.jackhuang.hmcl.ui.FXUtils.runInFX;
 import static org.jackhuang.hmcl.util.Logging.LOG;
 import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
@@ -54,6 +58,14 @@ public final class Launcher extends Application {
         try {
             try {
                 ConfigHolder.init();
+                AuthlibInjectorServers.init();
+
+                if (ConfigHolder.isNewlyCreated() && !AuthlibInjectorServers.getConfigInstance().getUrls().isEmpty()) {
+                    config().setPreferredLoginType(Accounts.getLoginType(Accounts.FACTORY_AUTHLIB_INJECTOR));
+                    AuthlibInjectorServers.getConfigInstance().getUrls().stream()
+                            .map(AuthlibInjectorServer::new)
+                            .forEach(config().getAuthlibInjectorServers()::add);
+                }
             } catch (IOException e) {
                 Main.showErrorAndExit(i18n("fatal.config_loading_failure", Paths.get("").toAbsolutePath().normalize()));
             }

HMCL/src/main/java/org/jackhuang/hmcl/game/HMCLModpackExportTask.java

@@ -25,6 +25,7 @@ import org.jackhuang.hmcl.util.gson.JsonUtils;
 import org.jackhuang.hmcl.util.io.Zipper;
 
 import java.io.File;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -73,9 +74,9 @@ public class HMCLModpackExportTask extends Task<Void> {
                 return false;
             });
 
-            Version mv = repository.getResolvedVersion(version);
+            Version mv = repository.getResolvedPreservingPatchesVersion(version);
             String gameVersion = GameVersion.minecraftVersion(repository.getVersionJar(version))
-                    .orElseThrow(() ->  new IllegalStateException("Cannot parse the version of " + version));
+                    .orElseThrow(() ->  new IOException("Cannot parse the version of " + version));
             zip.putTextFile(JsonUtils.GSON.toJson(mv.setJar(gameVersion)), "minecraft/pack.json"); // Making "jar" to gameVersion is to be compatible with old HMCL.
             zip.putTextFile(JsonUtils.GSON.toJson(modpack.setGameVersion(gameVersion)), "modpack.json"); // Newer HMCL only reads 'gameVersion' field.
         }

HMCL/src/main/java/org/jackhuang/hmcl/game/HMCLModpackInstallTask.java

@@ -19,7 +19,8 @@ package org.jackhuang.hmcl.game;
 
 import com.google.gson.JsonParseException;
 import com.google.gson.reflect.TypeToken;
-import org.jackhuang.hmcl.download.DependencyManager;
+import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.download.LibraryAnalyzer;
 import org.jackhuang.hmcl.mod.MinecraftInstanceTask;
 import org.jackhuang.hmcl.mod.Modpack;
 import org.jackhuang.hmcl.mod.ModpackConfiguration;
@@ -39,12 +40,13 @@ public final class HMCLModpackInstallTask extends Task<Void> {
     private final File zipFile;
     private final String name;
     private final HMCLGameRepository repository;
+    private final DefaultDependencyManager dependency;
     private final Modpack modpack;
     private final List<Task<?>> dependencies = new LinkedList<>();
     private final List<Task<?>> dependents = new LinkedList<>();
 
     public HMCLModpackInstallTask(Profile profile, File zipFile, Modpack modpack, String name) {
-        DependencyManager dependency = profile.getDependency();
+        dependency = profile.getDependency();
         repository = profile.getRepository();
         this.zipFile = zipFile;
         this.name = name;
@@ -88,8 +90,18 @@ public final class HMCLModpackInstallTask extends Task<Void> {
     @Override
     public void execute() throws Exception {
         String json = CompressingUtils.readTextZipEntry(zipFile, "minecraft/pack.json");
-        Version version = JsonUtils.GSON.fromJson(json, Version.class).setId(name).setJar(null);
-        dependencies.add(repository.save(version));
+        Version originalVersion = JsonUtils.GSON.fromJson(json, Version.class).setId(name).setJar(null);
+        LibraryAnalyzer analyzer = LibraryAnalyzer.analyze(originalVersion);
+        Task<Version> libraryTask = Task.supplyAsync(() -> originalVersion);
+        // reinstall libraries
+        // libraries of Forge and OptiFine should be obtained by installation.
+        for (LibraryAnalyzer.LibraryMark mark : analyzer) {
+            if (LibraryAnalyzer.LibraryType.MINECRAFT.getPatchId().equals(mark.getLibraryId()))
+                continue;
+            libraryTask = libraryTask.thenComposeAsync(version -> dependency.installLibraryAsync(modpack.getGameVersion(), version, mark.getLibraryId(), mark.getLibraryVersion()));
+        }
+
+        dependencies.add(libraryTask.thenComposeAsync(repository::save));
         dependencies.add(new MinecraftInstanceTask<>(zipFile, modpack.getEncoding(), "/minecraft", modpack, MODPACK_TYPE, repository.getModpackConfiguration(name)));
     }
 

HMCL/src/main/java/org/jackhuang/hmcl/game/ModpackHelper.java

@@ -123,7 +123,7 @@ public final class ModpackHelper {
             return new MultiMCModpackInstallTask(profile.getDependency(), zipFile, modpack, ((MultiMCInstanceConfiguration) modpack.getManifest()), name)
                     .whenComplete(Schedulers.defaultScheduler(), success, failure)
                     .thenComposeAsync(new MultiMCInstallVersionSettingTask(profile, ((MultiMCInstanceConfiguration) modpack.getManifest()), name));
-        else throw new IllegalStateException("Unrecognized modpack: " + modpack);
+        else throw new IllegalArgumentException("Unrecognized modpack: " + modpack);
     }
 
     public static Task<Void> getUpdateTask(Profile profile, File zipFile, Charset charset, String name, ModpackConfiguration<?> configuration) throws UnsupportedModpackException, MismatchedModpackTypeException {

HMCL/src/main/java/org/jackhuang/hmcl/game/TexturesLoader.java

@@ -121,6 +121,9 @@ public final class TexturesLoader {
         try (InputStream in = Files.newInputStream(file)) {
             img = ImageIO.read(in);
         }
+        if (img == null)
+            throw new IOException("Texture is malformed");
+
         Map<String, String> metadata = texture.getMetadata();
         if (metadata == null) {
             metadata = emptyMap();

HMCL/src/main/java/org/jackhuang/hmcl/setting/AuthlibInjectorServers.java

@@ -0,0 +1,78 @@
+/*
+ * Hello Minecraft! Launcher
+ * Copyright (C) 2019  huangyuhui <[email protected]> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.jackhuang.hmcl.setting;
+
+import com.google.gson.JsonParseException;
+import org.jackhuang.hmcl.util.gson.JsonUtils;
+import org.jackhuang.hmcl.util.gson.Validation;
+import org.jackhuang.hmcl.util.io.FileUtils;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Collections;
+import java.util.List;
+import java.util.logging.Level;
+
+import static org.jackhuang.hmcl.util.Logging.LOG;
+
+public class AuthlibInjectorServers implements Validation {
+
+    public static final String CONFIG_FILENAME = "authlib-injectors.json";
+
+    private final List<String> urls;
+
+    public AuthlibInjectorServers(List<String> urls) {
+        this.urls = urls;
+    }
+
+    public List<String> getUrls() {
+        return urls;
+    }
+
+    @Override
+    public void validate() throws JsonParseException {
+        if (urls == null)
+            throw new JsonParseException("authlib-injectors.json -> urls cannot be null");
+    }
+
+    private static final Path configLocation = Paths.get(CONFIG_FILENAME);
+    private static AuthlibInjectorServers configInstance;
+
+    public synchronized static void init() {
+        if (configInstance != null) {
+            throw new IllegalStateException("AuthlibInjectorServers is already loaded");
+        }
+
+        configInstance = new AuthlibInjectorServers(Collections.emptyList());
+
+        if (Files.exists(configLocation)) {
+            try {
+                String content = FileUtils.readText(configLocation);
+                configInstance = JsonUtils.GSON.fromJson(content, AuthlibInjectorServers.class);
+            } catch (IOException | JsonParseException e) {
+                LOG.log(Level.WARNING, "Malformed authlib-injectors.json", e);
+            }
+        }
+    }
+
+    public static AuthlibInjectorServers getConfigInstance() {
+        return configInstance;
+    }
+}

HMCL/src/main/java/org/jackhuang/hmcl/setting/ConfigHolder.java

@@ -52,6 +52,10 @@ public final class ConfigHolder {
         return configInstance;
     }
 
+    public static boolean isNewlyCreated() {
+        return newlyCreated;
+    }
+
     public synchronized static void init() throws IOException {
         if (configInstance != null) {
             throw new IllegalStateException("Configuration is already loaded");

HMCL/src/main/java/org/jackhuang/hmcl/ui/download/AdditionalInstallersPage.java

@@ -113,16 +113,14 @@ class AdditionalInstallersPage extends StackPane implements WizardPage {
         String liteLoader = analyzer.getVersion(LITELOADER).orElse(null);
         String optiFine = analyzer.getVersion(OPTIFINE).orElse(null);
 
-        JFXButton[] buttons = new JFXButton[]{btnFabric, btnForge, btnLiteLoader, btnOptiFine};
         Label[] labels = new Label[]{lblFabric, lblForge, lblLiteLoader, lblOptiFine};
         String[] libraryIds = new String[]{"fabric", "forge", "liteloader", "optifine"};
         String[] versions = new String[]{fabric, forge, liteLoader, optiFine};
 
         for (int i = 0; i < libraryIds.length; ++i) {
             String libraryId = libraryIds[i];
-            buttons[i].setDisable(versions[i] != null);
             if (versions[i] != null || controller.getSettings().containsKey(libraryId))
-                labels[i].setText(i18n("install.installer.version", i18n("install.installer." + libraryId)) + ": " + Lang.nonNull(versions[i], getVersion(libraryId)));
+                labels[i].setText(i18n("install.installer.version", i18n("install.installer." + libraryId)) + ": " + Lang.nonNull(getVersion(libraryId), versions[i]));
             else
                 labels[i].setText(i18n("install.installer.not_installed", i18n("install.installer." + libraryId)));
         }

HMCL/src/main/java/org/jackhuang/hmcl/ui/download/InstallerWizardProvider.java

@@ -18,9 +18,11 @@
 package org.jackhuang.hmcl.ui.download;
 
 import javafx.scene.Node;
+import org.jackhuang.hmcl.download.DefaultDependencyManager;
 import org.jackhuang.hmcl.download.DownloadProvider;
 import org.jackhuang.hmcl.download.RemoteVersion;
 import org.jackhuang.hmcl.download.VersionMismatchException;
+import org.jackhuang.hmcl.download.fabric.FabricInstallTask;
 import org.jackhuang.hmcl.download.game.LibraryDownloadException;
 import org.jackhuang.hmcl.download.optifine.OptiFineInstallTask;
 import org.jackhuang.hmcl.game.Version;
@@ -114,9 +116,10 @@ public final class InstallerWizardProvider implements WizardProvider {
             } else {
                 Controllers.dialog(i18n("install.failed.downloading.detail", ((DownloadException) exception).getUrl()) + "\n" + StringUtils.getStackTrace(exception.getCause()), i18n("install.failed.downloading"), MessageType.ERROR, next);
             }
-        } else if (exception instanceof OptiFineInstallTask.UnsupportedOptiFineInstallationException) {
+        } else if (exception instanceof OptiFineInstallTask.UnsupportedOptiFineInstallationException ||
+                exception instanceof FabricInstallTask.UnsupportedFabricInstallationException) {
             Controllers.dialog(i18n("install.failed.optifine_conflict"), i18n("install.failed"), MessageType.ERROR, next);
-        } else if (exception instanceof UnsupportedOperationException) {
+        } else if (exception instanceof DefaultDependencyManager.UnsupportedLibraryInstallerException) {
             Controllers.dialog(i18n("install.failed.install_online"), i18n("install.failed"), MessageType.ERROR, next);
         } else if (exception instanceof VersionMismatchException) {
             VersionMismatchException e = ((VersionMismatchException) exception);

HMCL/src/main/java/org/jackhuang/hmcl/ui/download/InstallersPage.java

@@ -30,8 +30,11 @@ import org.jackhuang.hmcl.ui.FXUtils;
 import org.jackhuang.hmcl.ui.construct.Validator;
 import org.jackhuang.hmcl.ui.wizard.WizardController;
 import org.jackhuang.hmcl.ui.wizard.WizardPage;
+import org.jackhuang.hmcl.util.Lang;
 import org.jackhuang.hmcl.util.StringUtils;
+import org.jackhuang.hmcl.util.platform.OperatingSystem;
 
+import java.nio.file.Paths;
 import java.util.Map;
 
 import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
@@ -83,7 +86,9 @@ public class InstallersPage extends StackPane implements WizardPage {
         String gameVersion = ((RemoteVersion) controller.getSettings().get("game")).getGameVersion();
         Validator hasVersion = new Validator(s -> !repository.hasVersion(s) && StringUtils.isNotBlank(s));
         hasVersion.setMessage(i18n("install.new_game.already_exists"));
-        txtName.getValidators().add(hasVersion);
+        Validator nameValidator = new Validator(OperatingSystem::isNameValid);
+        nameValidator.setMessage(i18n("install.new_game.malformed"));
+        txtName.getValidators().addAll(hasVersion, nameValidator);
         txtName.textProperty().addListener(e -> btnInstall.setDisable(!txtName.validate()));
         txtName.setText(gameVersion);
 

HMCL/src/main/java/org/jackhuang/hmcl/ui/download/UpdateInstallerWizardProvider.java

@@ -58,8 +58,7 @@ public final class UpdateInstallerWizardProvider implements WizardProvider {
 
         // We remove library but not save it,
         // so if installation failed will not break down current version.
-        return profile.getDependency().removeLibraryWithoutSavingAsync(version.getId(), libraryId)
-                .thenComposeAsync(profile.getDependency().installLibraryAsync((RemoteVersion) settings.get(libraryId)))
+        return profile.getDependency().installLibraryAsync(version, (RemoteVersion) settings.get(libraryId))
                 .thenComposeAsync(profile.getRepository().refreshVersionsAsync());
     }
 

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/GameItem.java

@@ -60,14 +60,16 @@ public class GameItem extends Control {
                 .thenAcceptAsync(game -> {
                     StringBuilder libraries = new StringBuilder(game);
                     LibraryAnalyzer analyzer = LibraryAnalyzer.analyze(profile.getRepository().getResolvedPreservingPatchesVersion(id));
-                    analyzer.forEachLibrary((libraryId, libraryVersion) -> {
-                        if (libraryId.equals(MINECRAFT.getPatchId())) return;
+                    for (LibraryAnalyzer.LibraryMark mark : analyzer) {
+                        String libraryId = mark.getLibraryId();
+                        String libraryVersion = mark.getLibraryVersion();
+                        if (libraryId.equals(MINECRAFT.getPatchId())) continue;
                         if (I18n.hasKey("install.installer." + libraryId)) {
                             libraries.append(", ").append(i18n("install.installer." + libraryId));
                             if (libraryVersion != null)
                                 libraries.append(": ").append(modifyVersion("", libraryVersion.replaceAll("(?i)" + libraryId, "")));
                         }
-                    });
+                    }
 
                     subtitle.set(libraries.toString());
                 }, Platform::runLater)

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/InstallerListPage.java

@@ -79,14 +79,17 @@ public class InstallerListPage extends ListPageBase<InstallerItem> {
             return LibraryAnalyzer.analyze(profile.getRepository().getResolvedPreservingPatchesVersion(versionId));
         }).thenAcceptAsync(Schedulers.javafx(), analyzer -> {
             Function<String, Consumer<InstallerItem>> removeAction = libraryId -> x -> {
-                profile.getDependency().removeLibraryAsync(version.getId(), libraryId)
+                profile.getDependency().removeLibraryAsync(version, libraryId)
+                        .thenComposeAsync(profile.getRepository()::save)
                         .withComposeAsync(profile.getRepository().refreshVersionsAsync())
                         .withRunAsync(Schedulers.javafx(), () -> loadVersion(this.profile, this.versionId))
                         .start();
             };
 
             itemsProperty().clear();
-            analyzer.forEachLibrary((libraryId, libraryVersion) -> {
+            for (LibraryAnalyzer.LibraryMark mark : analyzer) {
+                String libraryId = mark.getLibraryId();
+                String libraryVersion = mark.getLibraryVersion();
                 String title = I18n.hasKey("install.installer." + libraryId) ? i18n("install.installer." + libraryId) : libraryId;
                 Consumer<InstallerItem> action = "game".equals(libraryId) ? null : removeAction.apply(libraryId);
                 if (libraryVersion != null && Lang.test(() -> profile.getDependency().getVersionList(libraryId)))
@@ -96,7 +99,7 @@ public class InstallerListPage extends ListPageBase<InstallerItem> {
                             }, action));
                 else
                     itemsProperty().add(new InstallerItem(title, libraryVersion, null, action));
-            });
+            }
         }).start();
     }
 

HMCL/src/main/resources/assets/lang/I18N.properties

@@ -132,7 +132,7 @@ install.failed.downloading=Failed to install due to some files not downloaded su
 install.failed.downloading.detail=Failed to download file: %s
 install.failed.downloading.timeout=Download timed out: %s
 install.failed.install_online=Unable to recognize what you provided installer file is
-install.failed.optifine_conflict=OptiFine and Forge are both installed simultaneously on Minecraft 1.13
+install.failed.optifine_conflict=Fabric, OptiFine and Forge are both installed simultaneously on Minecraft 1.13
 install.failed.version_mismatch=The library requires game version %s, but actual version is %s.
 install.installer.choose=Choose a %s version
 install.installer.fabric=Fabric
@@ -152,6 +152,7 @@ install.modpack=Install a modpack
 install.new_game=Install a New Game
 install.new_game.already_exists=This version has already been existing.
 install.new_game.current_game_version=Current Game Version
+install.new_game.malformed=Name malformed
 install.select=Select an operation
 install.success=Installed successfully
 

HMCL/src/main/resources/assets/lang/I18N_zh.properties

@@ -150,6 +150,7 @@ install.modpack=安裝整合包
 install.new_game=安裝新遊戲版本
 install.new_game.already_exists=此版本已經存在，請換一個名字
 install.new_game.current_game_version=目前遊戲版本
+install.new_game.malformed=名字不合法
 install.select=請選擇安裝方式
 install.success=安裝成功
 

HMCL/src/main/resources/assets/lang/I18N_zh_CN.properties

@@ -151,6 +151,7 @@ install.modpack=安装整合包
 install.new_game=安装新游戏版本
 install.new_game.already_exists=此版本已经存在，请换一个名字
 install.new_game.current_game_version=当前游戏版本
+install.new_game.malformed=名字不合法
 install.select=请选择安装方式
 install.success=安装成功
 

HMCLCore/src/main/java/org/jackhuang/hmcl/download/DefaultCacheRepository.java

@@ -23,8 +23,11 @@ import org.jackhuang.hmcl.game.Library;
 import org.jackhuang.hmcl.game.LibraryDownloadInfo;
 import org.jackhuang.hmcl.util.*;
 import org.jackhuang.hmcl.util.gson.JsonUtils;
+import org.jackhuang.hmcl.util.gson.TolerableValidationException;
+import org.jackhuang.hmcl.util.gson.Validation;
 import org.jackhuang.hmcl.util.io.FileUtils;
 import org.jackhuang.hmcl.util.platform.OperatingSystem;
+import org.jetbrains.annotations.NotNull;
 
 import java.io.IOException;
 import java.nio.file.Files;
@@ -60,7 +63,7 @@ public class DefaultCacheRepository extends CacheRepository {
         lock.writeLock().lock();
         try {
             if (Files.isRegularFile(indexFile))
-                index = JsonUtils.GSON.fromJson(FileUtils.readText(indexFile.toFile()), Index.class);
+                index = JsonUtils.fromNonNullJson(FileUtils.readText(indexFile.toFile()), Index.class);
             else
                 index = new Index();
         } catch (IOException | JsonParseException e) {
@@ -214,7 +217,7 @@ public class DefaultCacheRepository extends CacheRepository {
      *     // assets and versions will not be included in index.
      * }
      */
-    private class Index {
+    private class Index implements Validation {
         private final Set<LibraryIndex> libraries;
 
         public Index() {
@@ -222,21 +225,28 @@ public class DefaultCacheRepository extends CacheRepository {
         }
 
         public Index(Set<LibraryIndex> libraries) {
-            this.libraries = libraries;
+            this.libraries = Objects.requireNonNull(libraries);
         }
 
+        @NotNull
         public Set<LibraryIndex> getLibraries() {
             return libraries;
         }
+
+        @Override
+        public void validate() throws JsonParseException, TolerableValidationException {
+            if (libraries == null)
+                throw new JsonParseException("Index.libraries cannot be null");
+        }
     }
 
-    private class LibraryIndex {
+    private class LibraryIndex implements Validation {
         private final String name;
         private final String hash;
         private final String type;
 
         public LibraryIndex() {
-            this(null, null, null);
+            this("", "", "");
         }
 
         public LibraryIndex(String name, String hash, String type) {
@@ -245,18 +255,27 @@ public class DefaultCacheRepository extends CacheRepository {
             this.type = type;
         }
 
+        @NotNull
         public String getName() {
             return name;
         }
 
+        @NotNull
         public String getHash() {
             return hash;
         }
 
+        @NotNull
         public String getType() {
             return type;
         }
 
+        @Override
+        public void validate() throws JsonParseException, TolerableValidationException {
+            if (name == null || hash == null || type == null)
+                throw new JsonParseException("Index.LibraryIndex.* cannot be null");
+        }
+
         @Override
         public boolean equals(Object o) {
             if (this == o) return true;

HMCLCore/src/main/java/org/jackhuang/hmcl/download/DefaultDependencyManager.java

@@ -94,19 +94,19 @@ public class DefaultDependencyManager extends AbstractDependencyManager {
         VersionList<?> versionList = getVersionList(libraryId);
         return versionList.loadAsync(gameVersion, getDownloadProvider())
                 .thenComposeAsync(() -> installLibraryAsync(baseVersion, versionList.getVersion(gameVersion, libraryVersion)
-                        .orElseThrow(() -> new IllegalStateException("Remote library " + libraryId + " has no version " + libraryVersion))));
+                        .orElseThrow(() -> new IOException("Remote library " + libraryId + " has no version " + libraryVersion))));
     }
 
     @Override
     public Task<Version> installLibraryAsync(Version baseVersion, RemoteVersion libraryVersion) {
         if (baseVersion.isResolved()) throw new IllegalArgumentException("Version should not be resolved");
 
-        return libraryVersion.getInstallTask(this, baseVersion)
+        return removeLibraryAsync(baseVersion.resolvePreservingPatches(repository), libraryVersion.getLibraryId())
+                .thenComposeAsync(version -> libraryVersion.getInstallTask(this, version))
                 .thenApplyAsync(baseVersion::addPatch)
                 .thenComposeAsync(repository::save);
     }
 
-
     public ExceptionalFunction<Version, Task<Version>, ?> installLibraryAsync(RemoteVersion libraryVersion) {
         return version -> installLibraryAsync(version, libraryVersion);
     }
@@ -126,38 +126,32 @@ public class DefaultDependencyManager extends AbstractDependencyManager {
                     } catch (IOException ignore) {
                     }
 
-                    throw new UnsupportedOperationException("Library cannot be recognized");
+                    throw new UnsupportedLibraryInstallerException();
                 })
                 .thenApplyAsync(oldVersion::addPatch)
                 .thenComposeAsync(repository::save);
     }
 
+    public static class UnsupportedLibraryInstallerException extends Exception {
+    }
+
     /**
      * Remove installed library.
      * Will try to remove libraries and patches.
      *
-     * @param versionId version id
+     * @param version not resolved version
      * @param libraryId forge/liteloader/optifine/fabric
      * @return task to remove the specified library
      */
-    public Task<Version> removeLibraryWithoutSavingAsync(String versionId, String libraryId) {
+    public Task<Version> removeLibraryAsync(Version version, String libraryId) {
         // MaintainTask requires version that does not inherits from any version.
         // If we want to remove a library in dependent version, we should keep the dependents not changed
         // So resolving this game version to preserve all information in this version.json is necessary.
-        Version version = repository.getResolvedPreservingPatchesVersion(versionId);
+        if (version.isResolved())
+            throw new IllegalArgumentException("removeLibraryWithoutSavingAsync requires non-resolved version");
+        Version independentVersion = version.resolvePreservingPatches(repository);
 
-        return Task.supplyAsync(() -> LibraryAnalyzer.analyze(version).removeLibrary(libraryId).build());
+        return Task.supplyAsync(() -> LibraryAnalyzer.analyze(independentVersion).removeLibrary(libraryId).build());
     }
 
-    /**
-     * Remove installed library.
-     * Will try to remove libraries and patches.
-     *
-     * @param versionId version id
-     * @param libraryId forge/liteloader/optifine/fabric
-     * @return task to remove the specified library
-     */
-    public Task<Version> removeLibraryAsync(String versionId, String libraryId) {
-        return removeLibraryWithoutSavingAsync(versionId, libraryId).thenComposeAsync(repository::save);
-    }
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/download/DownloadProvider.java

@@ -17,6 +17,9 @@
  */
 package org.jackhuang.hmcl.download;
 
+import java.util.Arrays;
+import java.util.stream.Stream;
+
 /**
  * The service provider that provides Minecraft online file downloads.
  *
@@ -39,6 +42,12 @@ public interface DownloadProvider {
      */
     String injectURL(String baseURL);
 
+    default Stream<String> injectURLs(String[] baseURLs) {
+        Stream<String> urls = Arrays.stream(baseURLs);
+        Stream<String> jsonURLs = Arrays.stream(baseURLs).map(this::injectURL);
+        return Stream.concat(jsonURLs, urls);
+    }
+
     /**
      * the specific version list that this download provider provides. i.e. "forge", "liteloader", "game", "optifine"
      *

HMCLCore/src/main/java/org/jackhuang/hmcl/download/LibraryAnalyzer.java

@@ -20,19 +20,17 @@ package org.jackhuang.hmcl.download;
 import org.jackhuang.hmcl.game.Library;
 import org.jackhuang.hmcl.game.Version;
 import org.jackhuang.hmcl.util.Pair;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Optional;
+import java.util.*;
 import java.util.function.BiConsumer;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
-public final class LibraryAnalyzer {
+import static org.jackhuang.hmcl.util.Pair.pair;
+
+public final class LibraryAnalyzer implements Iterable<LibraryAnalyzer.LibraryMark> {
     private Version version;
     private final Map<String, Pair<Library, String>> libraries;
 
@@ -49,9 +47,23 @@ public final class LibraryAnalyzer {
         return Optional.ofNullable(libraries.get(type)).map(Pair::getValue);
     }
 
-    public void forEachLibrary(BiConsumer<String, @Nullable String> callback) {
-        for (Map.Entry<String, Pair<Library, String>> entry : libraries.entrySet())
-            callback.accept(entry.getKey(), entry.getValue().getValue());
+    @NotNull
+    @Override
+    public Iterator<LibraryMark> iterator() {
+        return new Iterator<LibraryMark>() {
+            Iterator<Map.Entry<String, Pair<Library, String>>> impl = libraries.entrySet().iterator();
+
+            @Override
+            public boolean hasNext() {
+                return impl.hasNext();
+            }
+
+            @Override
+            public LibraryMark next() {
+                Map.Entry<String, Pair<Library, String>> entry = impl.next();
+                return new LibraryMark(entry.getKey(), entry.getValue().getValue());
+            }
+        };
     }
 
     public boolean has(LibraryType type) {
@@ -122,7 +134,7 @@ public final class LibraryAnalyzer {
 
             for (LibraryType type : LibraryType.values()) {
                 if (type.group.matcher(groupId).matches() && type.artifact.matcher(artifactId).matches()) {
-                    libraries.put(type.getPatchId(), Pair.pair(library, library.getVersion()));
+                    libraries.put(type.getPatchId(), pair(library, library.getVersion()));
                     break;
                 }
             }
@@ -130,7 +142,7 @@ public final class LibraryAnalyzer {
 
         for (Version patch : version.getPatches()) {
             if (patch.isHidden()) continue;
-            libraries.put(patch.getId(), Pair.pair(null, patch.getVersion()));
+            libraries.put(patch.getId(), pair(null, patch.getVersion()));
         }
 
         return new LibraryAnalyzer(version, libraries);
@@ -169,4 +181,24 @@ public final class LibraryAnalyzer {
             return null;
         }
     }
+
+    public static class LibraryMark {
+        private final String libraryId;
+        private final String libraryVersion;
+
+        public LibraryMark(@NotNull String libraryId, @Nullable String libraryVersion) {
+            this.libraryId = libraryId;
+            this.libraryVersion = libraryVersion;
+        }
+
+        @NotNull
+        public String getLibraryId() {
+            return libraryId;
+        }
+
+        @Nullable
+        public String getLibraryVersion() {
+            return libraryVersion;
+        }
+    }
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/download/RemoteVersion.java

@@ -22,6 +22,7 @@ import org.jackhuang.hmcl.task.Task;
 import org.jackhuang.hmcl.util.ToStringBuilder;
 import org.jackhuang.hmcl.util.versioning.VersionNumber;
 
+import java.util.List;
 import java.util.Objects;
 
 /**
@@ -31,9 +32,10 @@ import java.util.Objects;
  */
 public class RemoteVersion implements Comparable<RemoteVersion> {
 
+    private final String libraryId;
     private final String gameVersion;
     private final String selfVersion;
-    private final String url;
+    private final String[] url;
     private final Type type;
 
     /**
@@ -43,8 +45,8 @@ public class RemoteVersion implements Comparable<RemoteVersion> {
      * @param selfVersion the version string of the remote version.
      * @param url         the installer or universal jar URL.
      */
-    public RemoteVersion(String gameVersion, String selfVersion, String url) {
-        this(gameVersion, selfVersion, url, Type.UNCATEGORIZED);
+    public RemoteVersion(String libraryId, String gameVersion, String selfVersion, String... url) {
+        this(libraryId, gameVersion, selfVersion, Type.UNCATEGORIZED, url);
     }
 
     /**
@@ -54,13 +56,18 @@ public class RemoteVersion implements Comparable<RemoteVersion> {
      * @param selfVersion the version string of the remote version.
      * @param url         the installer or universal jar URL.
      */
-    public RemoteVersion(String gameVersion, String selfVersion, String url, Type type) {
+    public RemoteVersion(String libraryId, String gameVersion, String selfVersion, Type type, String... url) {
+        this.libraryId = Objects.requireNonNull(libraryId);
         this.gameVersion = Objects.requireNonNull(gameVersion);
         this.selfVersion = Objects.requireNonNull(selfVersion);
         this.url = Objects.requireNonNull(url);
         this.type = Objects.requireNonNull(type);
     }
 
+    public String getLibraryId() {
+        return libraryId;
+    }
+
     public String getGameVersion() {
         return gameVersion;
     }
@@ -69,7 +76,7 @@ public class RemoteVersion implements Comparable<RemoteVersion> {
         return selfVersion;
     }
 
-    public String getUrl() {
+    public String[] getUrl() {
         return url;
     }
 

HMCLCore/src/main/java/org/jackhuang/hmcl/download/fabric/FabricInstallTask.java

@@ -65,7 +65,7 @@ public final class FabricInstallTask extends Task<Version> {
     }
 
     @Override
-    public void preExecute() {
+    public void preExecute() throws Exception {
         if (!Objects.equals("net.minecraft.client.main.Main", version.resolve(dependencyManager.getGameRepository()).getMainClass()))
             throw new UnsupportedFabricInstallationException();
     }
@@ -128,6 +128,6 @@ public final class FabricInstallTask extends Task<Version> {
         return new Version("net.fabricmc", loaderVersion, 30000, arguments, mainClass, libraries);
     }
 
-    public static class UnsupportedFabricInstallationException extends UnsupportedOperationException {
+    public static class UnsupportedFabricInstallationException extends Exception {
     }
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/download/fabric/FabricRemoteVersion.java

@@ -18,6 +18,7 @@
 package org.jackhuang.hmcl.download.fabric;
 
 import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.download.LibraryAnalyzer;
 import org.jackhuang.hmcl.download.RemoteVersion;
 import org.jackhuang.hmcl.game.Version;
 import org.jackhuang.hmcl.task.Task;
@@ -31,7 +32,7 @@ public class FabricRemoteVersion extends RemoteVersion {
      * @param url         the installer or universal jar URL.
      */
     FabricRemoteVersion(String gameVersion, String selfVersion, String url) {
-        super(gameVersion, selfVersion, url);
+        super(LibraryAnalyzer.LibraryType.FABRIC.getPatchId(), gameVersion, selfVersion, url);
     }
 
     @Override

HMCLCore/src/main/java/org/jackhuang/hmcl/download/forge/ForgeBMCLVersionList.java

@@ -28,11 +28,17 @@ import org.jackhuang.hmcl.util.StringUtils;
 import org.jackhuang.hmcl.util.gson.JsonUtils;
 import org.jackhuang.hmcl.util.gson.Validation;
 import org.jackhuang.hmcl.util.io.NetworkUtils;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 
+import static org.jackhuang.hmcl.util.Lang.mapOf;
+import static org.jackhuang.hmcl.util.Pair.pair;
+
 public final class ForgeBMCLVersionList extends VersionList<ForgeRemoteVersion> {
 
     public static final ForgeBMCLVersionList INSTANCE = new ForgeBMCLVersionList();
@@ -76,19 +82,28 @@ public final class ForgeBMCLVersionList extends VersionList<ForgeRemoteVersion>
                     for (ForgeVersion version : forgeVersions) {
                         if (version == null)
                             continue;
-                        String jar = null;
+                        List<String> urls = new ArrayList<>();
                         for (ForgeVersion.File file : version.getFiles())
                             if ("installer".equals(file.getCategory()) && "jar".equals(file.getFormat())) {
                                 String classifier = gameVersion + "-" + version.getVersion()
                                         + (StringUtils.isNotBlank(version.getBranch()) ? "-" + version.getBranch() : "");
-                                String fileName = "forge-" + classifier + "-" + file.getCategory() + "." + file.getFormat();
-                                jar = "https://bmclapi2.bangbang93.com/maven/net/minecraftforge/forge/" + classifier + "/" + fileName;
+                                String fileName1 = "forge-" + classifier + "-" + file.getCategory() + "." + file.getFormat();
+                                String fileName2 = "forge-" + classifier + "-" + gameVersion + "-" + file.getCategory() + "." + file.getFormat();
+                                urls.add(NetworkUtils.withQuery("https://bmclapi2.bangbang93.com/forge/download", mapOf(
+                                        pair("mcversion", version.getGameVersion()),
+                                        pair("version", version.getVersion()),
+                                        pair("branch", version.getBranch()),
+                                        pair("category", file.getCategory()),
+                                        pair("format", file.getFormat())
+                                )));
+                                urls.add("https://bmclapi2.bangbang93.com/maven/net/minecraftforge/forge/" + classifier + "/" + fileName1);
+                                urls.add("https://bmclapi2.bangbang93.com/maven/net/minecraftforge/forge/" + classifier + "-" + gameVersion + "/" + fileName2);
                             }
 
-                        if (jar == null)
+                        if (urls.isEmpty())
                             continue;
                         versions.put(gameVersion, new ForgeRemoteVersion(
-                                version.getGameVersion(), version.getVersion(), jar
+                                version.getGameVersion(), version.getVersion(), urls.toArray(new String[0])
                         ));
                     }
                 } finally {
@@ -121,18 +136,22 @@ public final class ForgeBMCLVersionList extends VersionList<ForgeRemoteVersion>
             this.files = files;
         }
 
+        @Nullable
         public String getBranch() {
             return branch;
         }
 
+        @NotNull
         public String getGameVersion() {
             return mcversion;
         }
 
+        @NotNull
         public String getVersion() {
             return version;
         }
 
+        @NotNull
         public List<File> getFiles() {
             return files;
         }

HMCLCore/src/main/java/org/jackhuang/hmcl/download/forge/ForgeInstallTask.java

@@ -33,10 +33,8 @@ import java.io.IOException;
 import java.nio.file.FileSystem;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Map;
-import java.util.Optional;
+import java.util.*;
+import java.util.stream.Collectors;
 
 import static org.jackhuang.hmcl.util.StringUtils.removePrefix;
 import static org.jackhuang.hmcl.util.StringUtils.removeSuffix;
@@ -69,7 +67,11 @@ public final class ForgeInstallTask extends Task<Version> {
     public void preExecute() throws Exception {
         installer = Files.createTempFile("forge-installer", ".jar");
 
-        dependent = new FileDownloadTask(NetworkUtils.toURL(remote.getUrl()), installer.toFile())
+        dependent = new FileDownloadTask(
+                Arrays.stream(remote.getUrl())
+                        .map(NetworkUtils::toURL)
+                        .collect(Collectors.toList()),
+                installer.toFile(), null)
                 .setCacheRepository(dependencyManager.getCacheRepository())
                 .setCaching(true);
     }

HMCLCore/src/main/java/org/jackhuang/hmcl/download/forge/ForgeNewInstallTask.java

@@ -38,6 +38,7 @@ import org.jackhuang.hmcl.util.platform.OperatingSystem;
 import org.jackhuang.hmcl.util.platform.SystemUtils;
 
 import java.io.FileNotFoundException;
+import java.io.IOException;
 import java.io.InputStream;
 import java.nio.file.FileSystem;
 import java.nio.file.Files;
@@ -230,19 +231,20 @@ public class ForgeNewInstallTask extends Task<Version> {
 
                 command.add(mainClass);
 
-                List<String> args = processor.getArgs().stream().map(arg -> {
+                List<String> args = new ArrayList<>(processor.getArgs().size());
+                for (String arg : processor.getArgs()) {
                     String parsed = parseLiteral(arg, data, ExceptionalFunction.identity());
                     if (parsed == null)
-                        throw new IllegalStateException("Invalid forge installation configuration");
-                    return parsed;
-                }).collect(Collectors.toList());
+                        throw new IOException("Invalid forge installation configuration");
+                    args.add(parsed);
+                }
 
                 command.addAll(args);
 
                 LOG.info("Executing external processor " + processor.getJar().toString() + ", command line: " + new CommandBuilder().addAll(command).toString());
                 int exitCode = SystemUtils.callExternalProcess(command);
                 if (exitCode != 0)
-                    throw new IllegalStateException("Game processor exited abnormally");
+                    throw new IOException("Game processor exited abnormally");
 
                 for (Map.Entry<String, String> entry : outputs.entrySet()) {
                     Path artifact = Paths.get(entry.getKey());

HMCLCore/src/main/java/org/jackhuang/hmcl/download/forge/ForgeRemoteVersion.java

@@ -18,6 +18,7 @@
 package org.jackhuang.hmcl.download.forge;
 
 import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.download.LibraryAnalyzer;
 import org.jackhuang.hmcl.download.RemoteVersion;
 import org.jackhuang.hmcl.game.Version;
 import org.jackhuang.hmcl.task.Task;
@@ -30,8 +31,8 @@ public class ForgeRemoteVersion extends RemoteVersion {
      * @param selfVersion the version string of the remote version.
      * @param url         the installer or universal jar URL.
      */
-    public ForgeRemoteVersion(String gameVersion, String selfVersion, String url) {
-        super(gameVersion, selfVersion, url);
+    public ForgeRemoteVersion(String gameVersion, String selfVersion, String... url) {
+        super(LibraryAnalyzer.LibraryType.FORGE.getPatchId(), gameVersion, selfVersion, url);
     }
 
     @Override

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameInstallTask.java

@@ -64,7 +64,7 @@ public class GameInstallTask extends Task<Version> {
 
     @Override
     public void execute() throws Exception {
-        Version patch = JsonUtils.GSON.fromJson(downloadTask.getResult(), Version.class)
+        Version patch = JsonUtils.fromNonNullJson(downloadTask.getResult(), Version.class)
                 .setId(MINECRAFT.getPatchId()).setVersion(remote.getGameVersion()).setJar(null).setPriority(0);
         setResult(patch);
 

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/GameRemoteVersion.java

@@ -18,6 +18,7 @@
 package org.jackhuang.hmcl.download.game;
 
 import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.download.LibraryAnalyzer;
 import org.jackhuang.hmcl.download.RemoteVersion;
 import org.jackhuang.hmcl.game.ReleaseType;
 import org.jackhuang.hmcl.game.Version;
@@ -37,7 +38,7 @@ public final class GameRemoteVersion extends RemoteVersion {
     private final Date time;
 
     public GameRemoteVersion(String gameVersion, String selfVersion, String url, ReleaseType type, Date time) {
-        super(gameVersion, selfVersion, url, getReleaseType(type));
+        super(LibraryAnalyzer.LibraryType.MINECRAFT.getPatchId(), gameVersion, selfVersion, getReleaseType(type), url);
         this.type = type;
         this.time = time;
     }

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/VersionJsonDownloadTask.java

@@ -24,9 +24,15 @@ import org.jackhuang.hmcl.task.GetTask;
 import org.jackhuang.hmcl.task.Task;
 import org.jackhuang.hmcl.util.io.NetworkUtils;
 
+import java.io.IOException;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 /**
  *
@@ -61,10 +67,12 @@ public final class VersionJsonDownloadTask extends Task<String> {
     }
 
     @Override
-    public void execute() {
+    public void execute() throws IOException {
         RemoteVersion remoteVersion = gameVersionList.getVersion(gameVersion, gameVersion)
-                .orElseThrow(() -> new IllegalStateException("Cannot find specific version " + gameVersion + " in remote repository"));
-        String jsonURL = dependencyManager.getDownloadProvider().injectURL(remoteVersion.getUrl());
-        dependencies.add(new GetTask(NetworkUtils.toURL(jsonURL)).storeTo(this::setResult));
+                .orElseThrow(() -> new IOException("Cannot find specific version " + gameVersion + " in remote repository"));
+        dependencies.add(new GetTask(
+                dependencyManager.getDownloadProvider().injectURLs(remoteVersion.getUrl())
+                        .map(NetworkUtils::toURL).collect(Collectors.toList()),
+                UTF_8).storeTo(this::setResult));
     }
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderInstallTask.java

@@ -67,7 +67,7 @@ public final class LiteLoaderInstallTask extends Task<Version> {
         Library library = new Library(
                 new Artifact("com.mumfrey", "liteloader", remote.getSelfVersion()),
                 "http://dl.liteloader.com/versions/",
-                new LibrariesDownloadInfo(new LibraryDownloadInfo(null, remote.getUrl()))
+                new LibrariesDownloadInfo(new LibraryDownloadInfo(null, remote.getUrl()[0]))
         );
 
         setResult(new Version(LibraryAnalyzer.LibraryType.LITELOADER.getPatchId(),

HMCLCore/src/main/java/org/jackhuang/hmcl/download/liteloader/LiteLoaderRemoteVersion.java

@@ -18,6 +18,7 @@
 package org.jackhuang.hmcl.download.liteloader;
 
 import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.download.LibraryAnalyzer;
 import org.jackhuang.hmcl.download.RemoteVersion;
 import org.jackhuang.hmcl.game.Library;
 import org.jackhuang.hmcl.game.Version;
@@ -36,7 +37,7 @@ public class LiteLoaderRemoteVersion extends RemoteVersion {
      * @param url         the installer or universal jar URL.
      */
     LiteLoaderRemoteVersion(String gameVersion, String selfVersion, String url, String tweakClass, Collection<Library> libraries) {
-        super(gameVersion, selfVersion, url);
+        super(LibraryAnalyzer.LibraryType.LITELOADER.getPatchId(), gameVersion, selfVersion, url);
 
         this.tweakClass = tweakClass;
         this.libraries = libraries;

HMCLCore/src/main/java/org/jackhuang/hmcl/download/optifine/OptiFineBMCLVersionList.java

@@ -72,7 +72,7 @@ public final class OptiFineBMCLVersionList extends VersionList<OptiFineRemoteVer
                         continue;
 
                     String gameVersion = VersionNumber.normalize(element.getGameVersion());
-                    versions.put(gameVersion, new OptiFineRemoteVersion(gameVersion, version, () -> mirror, isPre));
+                    versions.put(gameVersion, new OptiFineRemoteVersion(gameVersion, version, mirror, isPre));
                 }
             }
         };

HMCLCore/src/main/java/org/jackhuang/hmcl/download/optifine/OptiFineInstallTask.java

@@ -45,11 +45,8 @@ import java.io.IOException;
 import java.nio.file.FileSystem;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Optional;
+import java.util.*;
+import java.util.stream.Collectors;
 
 import static org.jackhuang.hmcl.util.Lang.getOrDefault;
 
@@ -91,7 +88,7 @@ public final class OptiFineInstallTask extends Task<Version> {
                 new Artifact("optifine", "OptiFine", mavenVersion, "installer"), null,
                 new LibrariesDownloadInfo(new LibraryDownloadInfo(
                         "optifine/OptiFine/" + mavenVersion + "/OptiFine-" + mavenVersion + "-installer.jar",
-                        remote.getUrl()))
+                        remote.getUrl()[0]))
         );
     }
 
@@ -105,7 +102,9 @@ public final class OptiFineInstallTask extends Task<Version> {
         dest = Files.createTempFile("optifine-installer", ".jar");
 
         if (installer == null) {
-            dependents.add(new FileDownloadTask(NetworkUtils.toURL(remote.getUrl()), dest.toFile())
+            dependents.add(new FileDownloadTask(
+                    Arrays.stream(remote.getUrl()).map(NetworkUtils::toURL).collect(Collectors.toList()),
+                    dest.toFile(), null)
                     .setCacheRepository(dependencyManager.getCacheRepository())
                     .setCaching(true));
         } else {
@@ -149,7 +148,7 @@ public final class OptiFineInstallTask extends Task<Version> {
                         gameRepository.getLibraryFile(version, optiFineLibrary).toString()
                 );
                 if (exitCode != 0)
-                    throw new IllegalStateException("OptiFine patcher failed");
+                    throw new IOException("OptiFine patcher failed");
             } else {
                 FileUtils.copyFile(dest, gameRepository.getLibraryFile(version, optiFineLibrary).toPath());
             }
@@ -188,7 +187,7 @@ public final class OptiFineInstallTask extends Task<Version> {
         dependencies.add(dependencyManager.checkLibraryCompletionAsync(getResult()));
     }
 
-    public static class UnsupportedOptiFineInstallationException extends UnsupportedOperationException {
+    public static class UnsupportedOptiFineInstallationException extends Exception {
     }
 
     /**
@@ -223,7 +222,7 @@ public final class OptiFineInstallTask extends Task<Version> {
                 throw new VersionMismatchException(mcVersion, gameVersion.get());
 
             return new OptiFineInstallTask(dependencyManager, version,
-                    new OptiFineRemoteVersion(mcVersion,  ofEdition + "_" + ofRelease, () -> null, false), installer);
+                    new OptiFineRemoteVersion(mcVersion,  ofEdition + "_" + ofRelease, "", false), installer);
         }
     }
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/download/optifine/OptiFineRemoteVersion.java

@@ -18,6 +18,7 @@
 package org.jackhuang.hmcl.download.optifine;
 
 import org.jackhuang.hmcl.download.DefaultDependencyManager;
+import org.jackhuang.hmcl.download.LibraryAnalyzer;
 import org.jackhuang.hmcl.download.RemoteVersion;
 import org.jackhuang.hmcl.game.Version;
 import org.jackhuang.hmcl.task.Task;
@@ -25,17 +26,9 @@ import org.jackhuang.hmcl.task.Task;
 import java.util.function.Supplier;
 
 public class OptiFineRemoteVersion extends RemoteVersion {
-    private final Supplier<String> url;
 
-    public OptiFineRemoteVersion(String gameVersion, String selfVersion, Supplier<String> url, boolean snapshot) {
-        super(gameVersion, selfVersion, "", snapshot ? Type.SNAPSHOT : Type.RELEASE);
-
-        this.url = url;
-    }
-
-    @Override
-    public String getUrl() {
-        return url.get();
+    public OptiFineRemoteVersion(String gameVersion, String selfVersion, String url, boolean snapshot) {
+        super(LibraryAnalyzer.LibraryType.OPTIFINE.getPatchId(), gameVersion, selfVersion, snapshot ? Type.SNAPSHOT : Type.RELEASE, url);
     }
 
     @Override

HMCLCore/src/main/java/org/jackhuang/hmcl/event/EventBus.java

@@ -20,6 +20,7 @@ package org.jackhuang.hmcl.event;
 import org.jackhuang.hmcl.util.Logging;
 
 import java.util.HashMap;
+import java.util.concurrent.ConcurrentHashMap;
 
 /**
  *
@@ -27,12 +28,11 @@ import java.util.HashMap;
  */
 public final class EventBus {
 
-    private final HashMap<Class<?>, EventManager<?>> events = new HashMap<>();
+    private final ConcurrentHashMap<Class<?>, EventManager<?>> events = new ConcurrentHashMap<>();
 
     @SuppressWarnings("unchecked")
     public <T extends Event> EventManager<T> channel(Class<T> clazz) {
-        if (!events.containsKey(clazz))
-            events.put(clazz, new EventManager<>());
+        events.putIfAbsent(clazz, new EventManager<>());
         return (EventManager<T>) events.get(clazz);
     }
 

HMCLCore/src/main/java/org/jackhuang/hmcl/event/EventManager.java

@@ -22,6 +22,7 @@ import org.jackhuang.hmcl.util.SimpleMultimap;
 import java.lang.ref.WeakReference;
 import java.util.EnumMap;
 import java.util.HashSet;
+import java.util.concurrent.CopyOnWriteArraySet;
 import java.util.function.Consumer;
 
 /**
@@ -31,7 +32,7 @@ import java.util.function.Consumer;
 public final class EventManager<T extends Event> {
 
     private final SimpleMultimap<EventPriority, Consumer<T>> handlers
-            = new SimpleMultimap<>(() -> new EnumMap<>(EventPriority.class), HashSet::new);
+            = new SimpleMultimap<>(() -> new EnumMap<>(EventPriority.class), CopyOnWriteArraySet::new);
 
     public Consumer<T> registerWeak(Consumer<T> consumer) {
         register(new WeakListener(consumer));

HMCLCore/src/main/java/org/jackhuang/hmcl/game/Arguments.java

@@ -23,11 +23,7 @@ import org.jackhuang.hmcl.util.Lang;
 import org.jackhuang.hmcl.util.platform.OperatingSystem;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 import java.util.stream.Collectors;
 
 /**
@@ -99,7 +95,7 @@ public final class Arguments {
     }
 
     public static List<String> parseStringArguments(List<String> arguments, Map<String, String> keys) {
-        return arguments.stream().flatMap(str -> new StringArgument(str).toString(keys, Collections.emptyMap()).stream()).collect(Collectors.toList());
+        return arguments.stream().filter(Objects::nonNull).flatMap(str -> new StringArgument(str).toString(keys, Collections.emptyMap()).stream()).collect(Collectors.toList());
     }
 
     public static List<String> parseArguments(List<Argument> arguments, Map<String, String> keys) {
@@ -107,7 +103,7 @@ public final class Arguments {
     }
 
     public static List<String> parseArguments(List<Argument> arguments, Map<String, String> keys, Map<String, Boolean> features) {
-        return arguments.stream().flatMap(arg -> arg.toString(keys, features).stream()).collect(Collectors.toList());
+        return arguments.stream().filter(Objects::nonNull).flatMap(arg -> arg.toString(keys, features).stream()).collect(Collectors.toList());
     }
 
     public static final List<Argument> DEFAULT_JVM_ARGUMENTS;

HMCLCore/src/main/java/org/jackhuang/hmcl/game/AssetObject.java

@@ -54,6 +54,6 @@ public final class AssetObject implements Validation {
     @Override
     public void validate() throws JsonParseException {
         if (StringUtils.isBlank(hash) || hash.length() < 2)
-            throw new IllegalStateException("AssetObject hash cannot be blank.");
+            throw new JsonParseException("AssetObject hash cannot be blank.");
     }
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/game/DownloadType.java

@@ -24,5 +24,7 @@ package org.jackhuang.hmcl.game;
 public enum DownloadType {
     CLIENT,
     SERVER,
-    WINDOWS_SERVER
+    WINDOWS_SERVER,
+    CLIENT_MAPPINGS,
+    SERVER_MAPPINGS
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/game/RuledArgument.java

@@ -23,10 +23,7 @@ import com.google.gson.reflect.TypeToken;
 import org.jackhuang.hmcl.util.Immutable;
 
 import java.lang.reflect.Type;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 import java.util.stream.Collectors;
 
 /**
@@ -69,6 +66,7 @@ public class RuledArgument implements Argument {
     public List<String> toString(Map<String, String> keys, Map<String, Boolean> features) {
         if (CompatibilityRule.appliesToCurrentEnvironment(rules, features) && value != null)
             return value.stream()
+                    .filter(Objects::nonNull)
                     .map(StringArgument::new)
                     .map(str -> str.toString(keys, features).get(0))
                     .collect(Collectors.toList());

HMCLCore/src/main/java/org/jackhuang/hmcl/game/Version.java

@@ -24,6 +24,7 @@ import org.jackhuang.hmcl.util.Lang;
 import org.jackhuang.hmcl.util.Logging;
 import org.jackhuang.hmcl.util.StringUtils;
 import org.jackhuang.hmcl.util.ToStringBuilder;
+import org.jackhuang.hmcl.util.gson.JsonMap;
 import org.jackhuang.hmcl.util.gson.Validation;
 import org.jetbrains.annotations.Nullable;
 
@@ -60,8 +61,8 @@ public class Version implements Comparable<Version>, Validation {
     private final String assets;
     private final List<Library> libraries;
     private final List<CompatibilityRule> compatibilityRules;
-    private final Map<DownloadType, DownloadInfo> downloads;
-    private final Map<DownloadType, LoggingInfo> logging;
+    private final JsonMap<DownloadType, DownloadInfo> downloads;
+    private final JsonMap<DownloadType, LoggingInfo> logging;
     private final ReleaseType type;
     private final Date time;
     private final Date releaseTime;
@@ -103,8 +104,8 @@ public class Version implements Comparable<Version>, Validation {
         this.assets = assets;
         this.libraries = Lang.copyList(libraries);
         this.compatibilityRules = Lang.copyList(compatibilityRules);
-        this.downloads = downloads == null ? null : new HashMap<>(downloads);
-        this.logging = logging == null ? null : new HashMap<>(logging);
+        this.downloads = downloads == null ? null : new JsonMap<>(downloads);
+        this.logging = logging == null ? null : new JsonMap<>(logging);
         this.type = type;
         this.time = time == null ? null : (Date) time.clone();
         this.releaseTime = releaseTime == null ? null : (Date) releaseTime.clone();

HMCLCore/src/main/java/org/jackhuang/hmcl/game/World.java

@@ -91,7 +91,7 @@ public class World {
     private void loadFromZipImpl(Path root) throws IOException {
         Path levelDat = root.resolve("level.dat");
         if (!Files.exists(levelDat))
-            throw new IllegalArgumentException("Not a valid world zip file since level.dat cannot be found.");
+            throw new IOException("Not a valid world zip file since level.dat cannot be found.");
 
         getWorldName(levelDat);
     }
@@ -116,6 +116,9 @@ public class World {
         CompoundTag nbt = parseLevelDat(levelDat);
 
         CompoundTag data = nbt.get("Data");
+        if (data == null)
+            throw new IOException("level.dat missing Data");
+
         if (data.get("LevelName") instanceof StringTag)
             worldName = data.<StringTag>get("LevelName").getValue();
         else
@@ -209,7 +212,7 @@ public class World {
                 return Files.list(savesDir).flatMap(world -> {
                     try {
                         return Stream.of(new World(world));
-                    } catch (IOException | IllegalArgumentException e) {
+                    } catch (IOException e) {
                         Logging.LOG.log(Level.WARNING, "Failed to read world " + world, e);
                         return Stream.empty();
                     }

HMCLCore/src/main/java/org/jackhuang/hmcl/mod/multimc/MultiMCModpackExportTask.java

@@ -27,6 +27,7 @@ import org.jackhuang.hmcl.util.gson.JsonUtils;
 import org.jackhuang.hmcl.util.io.Zipper;
 
 import java.io.File;
+import java.io.IOException;
 import java.io.StringWriter;
 import java.util.ArrayList;
 import java.util.List;
@@ -80,7 +81,7 @@ public class MultiMCModpackExportTask extends Task<Void> {
 
             LibraryAnalyzer analyzer = LibraryAnalyzer.analyze(repository.getResolvedPreservingPatchesVersion(versionId));
             String gameVersion = GameVersion.minecraftVersion(repository.getVersionJar(versionId))
-                    .orElseThrow(() ->  new IllegalStateException("Cannot parse the version of " + versionId));
+                    .orElseThrow(() -> new IOException("Cannot parse the version of " + versionId));
             List<MultiMCManifest.MultiMCManifestComponent> components = new ArrayList<>();
             components.add(new MultiMCManifest.MultiMCManifestComponent(true, false, "net.minecraft", gameVersion));
             analyzer.getVersion(FORGE).ifPresent(forgeVersion ->

HMCLCore/src/main/java/org/jackhuang/hmcl/task/FileDownloadTask.java

@@ -33,6 +33,9 @@ import java.net.URL;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.security.MessageDigest;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 import java.util.Optional;
 import java.util.logging.Level;
 
@@ -80,11 +83,10 @@ public class FileDownloadTask extends Task<Void> {
         }
     }
 
-    private final URL url;
+    private final List<URL> urls;
     private final File file;
     private final IntegrityCheck integrityCheck;
     private final int retry;
-    private final EventManager<FailedEvent<URL>> onFailed = new EventManager<>();
     private Path candidate;
     private boolean caching;
     private CacheRepository repository = CacheRepository.getInstance();
@@ -115,7 +117,7 @@ public class FileDownloadTask extends Task<Void> {
      * @param retry the times for retrying if downloading fails.
      */
     public FileDownloadTask(URL url, File file, IntegrityCheck integrityCheck, int retry) {
-        this.url = url;
+        this.urls = Collections.singletonList(url);
         this.file = file;
         this.integrityCheck = integrityCheck;
         this.retry = retry;
@@ -124,6 +126,25 @@ public class FileDownloadTask extends Task<Void> {
         setExecutor(Schedulers.io());
     }
 
+    /**
+     * Constructor.
+     * @param urls urls of remote file, will be attempted in order.
+     * @param file the location that download to.
+     * @param integrityCheck the integrity check to perform, null if no integrity check is to be performed
+     */
+    public FileDownloadTask(List<URL> urls, File file, IntegrityCheck integrityCheck) {
+        if (urls == null || urls.isEmpty())
+            throw new IllegalArgumentException("At least one URL is required");
+
+        this.urls = new ArrayList<>(urls);
+        this.file = file;
+        this.integrityCheck = integrityCheck;
+        this.retry = urls.size();
+
+        setName(file.getName());
+        setExecutor(Schedulers.io());
+    }
+
     private void closeFiles() {
         if (rFile != null)
             try {
@@ -143,14 +164,6 @@ public class FileDownloadTask extends Task<Void> {
         stream = null;
     }
 
-    public EventManager<FailedEvent<URL>> getOnFailed() {
-        return onFailed;
-    }
-
-    public URL getUrl() {
-        return url;
-    }
-
     public File getFile() {
         return file;
     }
@@ -172,8 +185,6 @@ public class FileDownloadTask extends Task<Void> {
 
     @Override
     public void execute() throws Exception {
-        URL currentURL = url;
-
         boolean checkETag;
         // Check cache
         if (integrityCheck != null && caching) {
@@ -182,7 +193,7 @@ public class FileDownloadTask extends Task<Void> {
             if (cache.isPresent()) {
                 try {
                     FileUtils.copyFile(cache.get().toFile(), file);
-                    Logging.LOG.log(Level.FINER, "Successfully verified file " + file + " from " + currentURL);
+                    Logging.LOG.log(Level.FINER, "Successfully verified file " + file + " from " + urls.get(0));
                     return;
                 } catch (IOException e) {
                     Logging.LOG.log(Level.WARNING, "Failed to copy cache files", e);
@@ -192,15 +203,11 @@ public class FileDownloadTask extends Task<Void> {
             checkETag = true;
         }
 
-        Logging.LOG.log(Level.FINER, "Downloading " + currentURL + " to " + file);
+        Logging.LOG.log(Level.FINER, "Downloading " + urls.get(0) + " to " + file);
         Exception exception = null;
 
         for (int repeat = 0; repeat < retry; repeat++) {
-            if (repeat > 0) {
-                FailedEvent<URL> event = new FailedEvent<>(this, repeat, currentURL);
-                onFailed.fireEvent(event);
-                currentURL = event.getNewResult();
-            }
+            URL url = urls.get(repeat % urls.size());
             if (Thread.interrupted()) {
                 Thread.currentThread().interrupt();
                 break;
@@ -226,7 +233,7 @@ public class FileDownloadTask extends Task<Void> {
                         repository.removeRemoteEntry(con);
                     }
                 } else if (con.getResponseCode() / 100 != 2) {
-                    throw new ResponseCodeException(currentURL, con.getResponseCode());
+                    throw new ResponseCodeException(url, con.getResponseCode());
                 }
 
                 int contentLength = con.getContentLength();
@@ -292,7 +299,7 @@ public class FileDownloadTask extends Task<Void> {
                 }
 
                 if (downloaded != contentLength)
-                    throw new IllegalStateException("Unexpected file size: " + downloaded + ", expected: " + contentLength);
+                    throw new IOException("Unexpected file size: " + downloaded + ", expected: " + contentLength);
 
                 // Integrity check
                 if (integrityCheck != null) {
@@ -312,17 +319,18 @@ public class FileDownloadTask extends Task<Void> {
                 }
 
                 return;
-            } catch (IOException | IllegalStateException e) {
+            } catch (IOException e) {
                 if (temp != null)
                     temp.toFile().delete();
                 exception = e;
+                Logging.LOG.log(Level.WARNING, "Failed to download " + url + ", repeat times: " + repeat + 1, e);
             } finally {
                 closeFiles();
             }
         }
 
         if (exception != null)
-            throw new DownloadException(currentURL, exception);
+            throw new DownloadException(urls.get(0), exception);
     }
 
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/task/GetTask.java

@@ -30,6 +30,9 @@ import java.net.HttpURLConnection;
 import java.net.URL;
 import java.nio.charset.Charset;
 import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 import java.util.logging.Level;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
@@ -40,7 +43,7 @@ import static java.nio.charset.StandardCharsets.UTF_8;
  */
 public final class GetTask extends Task<String> {
 
-    private final URL url;
+    private final List<URL> urls;
     private final Charset charset;
     private final int retry;
     private CacheRepository repository = CacheRepository.getInstance();
@@ -54,7 +57,7 @@ public final class GetTask extends Task<String> {
     }
 
     public GetTask(URL url, Charset charset, int retry) {
-        this.url = url;
+        this.urls = Collections.singletonList(url);
         this.charset = charset;
         this.retry = retry;
 
@@ -62,6 +65,15 @@ public final class GetTask extends Task<String> {
         setExecutor(Schedulers.io());
     }
 
+    public GetTask(List<URL> urls, Charset charset) {
+        this.urls = new ArrayList<>(urls);
+        this.charset = charset;
+        this.retry = urls.size();
+
+        setName(urls.get(0).toString());
+        setExecutor(Schedulers.io());
+    }
+
     public GetTask setCacheRepository(CacheRepository repository) {
         this.repository = repository;
         return this;
@@ -72,8 +84,7 @@ public final class GetTask extends Task<String> {
         Exception exception = null;
         boolean checkETag = true;
         for (int time = 0; time < retry; ++time) {
-            if (time > 0)
-                Logging.LOG.log(Level.WARNING, "Failed to download, repeat times: " + time);
+            URL url = urls.get(time % urls.size());
             try {
                 updateProgress(0);
                 HttpURLConnection conn = NetworkUtils.createConnection(url);
@@ -122,10 +133,11 @@ public final class GetTask extends Task<String> {
                 return;
             } catch (IOException ex) {
                 exception = ex;
+                Logging.LOG.log(Level.WARNING, "Failed to download " + url + ", repeat times: " + time + 1, ex);
             }
         }
         if (exception != null)
-            throw new DownloadException(url, exception);
+            throw new DownloadException(urls.get(0), exception);
     }
 
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/task/TaskExecutor.java

@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hmcl.task;
 
+import com.google.gson.JsonParseException;
 import org.jackhuang.hmcl.util.Lang;
 import org.jackhuang.hmcl.util.Logging;
 import org.jackhuang.hmcl.util.function.ExceptionalRunnable;
@@ -64,7 +65,9 @@ public final class TaskExecutor {
                         Logging.LOG.log(Level.WARNING, "An exception occurred in task execution", exception);
 
                         Throwable resolvedException = resolveException(exception);
-                        if (resolvedException instanceof RuntimeException) {
+                        if (resolvedException instanceof RuntimeException &&
+                                !(resolvedException instanceof CancellationException) &&
+                                !(resolvedException instanceof JsonParseException)) {
                             // Track uncaught RuntimeException which are thrown mostly by our mistake
                             if (uncaughtExceptionHandler != null)
                                 uncaughtExceptionHandler.uncaughtException(Thread.currentThread(), resolvedException);

HMCLCore/src/main/java/org/jackhuang/hmcl/util/gson/JsonMap.java

@@ -0,0 +1,51 @@
+/*
+ * Hello Minecraft! Launcher
+ * Copyright (C) 2019  huangyuhui <[email protected]> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.jackhuang.hmcl.util.gson;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * To resolve JsonParseException: duplicate key: null
+ * By skipping inserting data with key null
+ * @param <K>
+ * @param <V>
+ */
+public class JsonMap<K, V> extends HashMap<K, V> {
+    public JsonMap(int initialCapacity, float loadFactor) {
+        super(initialCapacity, loadFactor);
+    }
+
+    public JsonMap(int initialCapacity) {
+        super(initialCapacity);
+    }
+
+    public JsonMap() {
+        super();
+    }
+
+    public JsonMap(Map<? extends K, ? extends V> m) {
+        super(m);
+    }
+
+    @Override
+    public V put(K key, V value) {
+        if (key == null) return null;
+        return super.put(key, value);
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/CompressingUtils.java

@@ -179,6 +179,8 @@ public final class CompressingUtils {
             throw new ZipException(error.getMessage());
         } catch (UnsupportedOperationException ex) {
             throw new IOException("Not a zip file", ex);
+        } catch (FileSystemNotFoundException ex) {
+            throw new IOException("Java Environment is broken");
         }
     }
 

HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/NetworkUtils.java

@@ -40,6 +40,8 @@ public final class NetworkUtils {
             StringBuilder sb = new StringBuilder(baseUrl);
             boolean first = true;
             for (Entry<String, String> param : params.entrySet()) {
+                if (param.getValue() == null)
+                    continue;
                 if (first) {
                     sb.append('?');
                     first = false;

HMCLCore/src/main/java/org/jackhuang/hmcl/util/platform/OperatingSystem.java

@@ -28,8 +28,10 @@ import java.lang.management.ManagementFactory;
 import java.nio.charset.Charset;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.Arrays;
 import java.util.Locale;
 import java.util.Optional;
+import java.util.regex.Pattern;
 
 /**
  * Represents the operating system.
@@ -98,6 +100,10 @@ public enum OperatingSystem {
      */
     public static final String SYSTEM_ARCHITECTURE;
 
+    public static final Pattern INVALID_RESOURCE_CHARACTERS;
+    private static final String[] INVALID_RESOURCE_BASENAMES;
+    private static final String[] INVALID_RESOURCE_FULLNAMES;
+
     static {
         String name = System.getProperty("os.name").toLowerCase(Locale.US);
         if (name.contains("win"))
@@ -119,6 +125,24 @@ public enum OperatingSystem {
         if (arch == null)
             arch = System.getProperty("os.arch");
         SYSTEM_ARCHITECTURE = arch;
+
+        // setup the invalid names
+        if (CURRENT_OS == WINDOWS) {
+            // valid names and characters taken from http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/naming_a_file.asp
+            INVALID_RESOURCE_CHARACTERS = Pattern.compile("[/\"<>|?*:\\\\]");
+            INVALID_RESOURCE_BASENAMES = new String[]{"aux", "com1", "com2", "com3", "com4", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
+                    "com5", "com6", "com7", "com8", "com9", "con", "lpt1", "lpt2", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ //$NON-NLS-6$ //$NON-NLS-7$ //$NON-NLS-8$
+                    "lpt3", "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9", "nul", "prn"}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ //$NON-NLS-6$ //$NON-NLS-7$ //$NON-NLS-8$ //$NON-NLS-9$
+            Arrays.sort(INVALID_RESOURCE_BASENAMES);
+            //CLOCK$ may be used if an extension is provided
+            INVALID_RESOURCE_FULLNAMES = new String[]{"clock$"}; //$NON-NLS-1$
+        } else {
+            //only front slash and null char are invalid on UNIXes
+            //taken from http://www.faqs.org/faqs/unix-faq/faq/part2/section-2.html
+            INVALID_RESOURCE_CHARACTERS = null;
+            INVALID_RESOURCE_BASENAMES = null;
+            INVALID_RESOURCE_FULLNAMES = null;
+        }
     }
 
     private static Optional<Long> getTotalPhysicalMemorySize() {
@@ -154,4 +178,38 @@ public enum OperatingSystem {
                 return Paths.get(home, folder);
         }
     }
+
+    /**
+     * Returns true if the given name is a valid resource name on this operating system,
+     * and false otherwise.
+     */
+    public static boolean isNameValid(String name) {
+        //. and .. have special meaning on all platforms
+        if (name.equals(".") || name.equals("..") || name.indexOf('/') == 0 || name.indexOf('\0') >= 0) //$NON-NLS-1$ //$NON-NLS-2$
+            return false;
+        if (CURRENT_OS == WINDOWS) {
+            //empty names are not valid
+            final int length = name.length();
+            if (length == 0)
+                return false;
+            final char lastChar = name.charAt(length - 1);
+            // filenames ending in dot are not valid
+            if (lastChar == '.')
+                return false;
+            // file names ending with whitespace are truncated (bug 118997)
+            if (Character.isWhitespace(lastChar))
+                return false;
+            int dot = name.indexOf('.');
+            // on windows, filename suffixes are not relevant to name validity
+            String basename = dot == -1 ? name : name.substring(0, dot);
+            if (Arrays.binarySearch(INVALID_RESOURCE_BASENAMES, basename.toLowerCase()) >= 0)
+                return false;
+            if (Arrays.binarySearch(INVALID_RESOURCE_FULLNAMES, name.toLowerCase()) >= 0)
+                return false;
+            if (INVALID_RESOURCE_CHARACTERS != null && INVALID_RESOURCE_CHARACTERS.matcher(name).find())
+                return false;
+        }
+
+        return true;
+    }
 }