Suggest user to install latest Java 8 to avoid potentional game crashing

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

@@ -227,29 +227,50 @@ public final class LauncherHelper {
             flag = true;
         }
 
-        if (!flag && java.getParsedVersion() < JavaVersion.JAVA_8) {
-            if (gameVersion.compareTo(VersionNumber.asVersion("1.13")) >= 0) {
-                // Minecraft 1.13 and later versions only support Java 8 or later.
-                // Terminate launching operation.
-                Controllers.dialog(i18n("launch.advice.java8_1_13"), i18n("message.error"), MessageBox.ERROR_MESSAGE, null);
+        // Game later than 1.7.2 accepts Java 8.
+        if (!flag && java.getParsedVersion() < JavaVersion.JAVA_8 && gameVersion.compareTo(VersionNumber.asVersion("1.7.2")) > 0) {
+            Optional<JavaVersion> java8 = JavaVersion.getJREs().stream()
+                    .filter(javaVersion -> javaVersion.getParsedVersion() >= JavaVersion.JAVA_8)
+                    .max(Comparator.comparing(JavaVersion::getVersionNumber));
+            if (java8.isPresent()) {
+                setting.setJavaVersion(java8.get());
             } else {
-                // Most mods require Java 8 or later version.
-                Controllers.dialog(i18n("launch.advice.newer_java"), i18n("message.warning"), MessageBox.WARNING_MESSAGE, onAccept);
+                if (gameVersion.compareTo(VersionNumber.asVersion("1.13")) >= 0) {
+                    // Minecraft 1.13 and later versions only support Java 8 or later.
+                    // Terminate launching operation.
+                    Controllers.dialog(i18n("launch.advice.java8_1_13"), i18n("message.error"), MessageBox.ERROR_MESSAGE, null);
+                } else {
+                    // Most mods require Java 8 or later version.
+                    Controllers.dialog(i18n("launch.advice.newer_java"), i18n("message.warning"), MessageBox.WARNING_MESSAGE, onAccept);
+                }
+                flag = true;
             }
-            flag = true;
         }
 
         // LaunchWrapper will crash because of assuming the system class loader is an instance of URLClassLoader.
         // cpw has claimed that he will make MinecraftForge of 1.13 and later versions able to run on Java 9.
-        if (!flag && java.getParsedVersion() >= JavaVersion.JAVA_9 && gameVersion.compareTo(VersionNumber.asVersion("1.12.5")) < 0 && version.getMainClass().contains("launchwrapper")) {
+        if (!flag && java.getParsedVersion() >= JavaVersion.JAVA_9 && gameVersion.compareTo(VersionNumber.asVersion("1.13")) < 0 && version.getMainClass().contains("launchwrapper")) {
             Optional<JavaVersion> java8 = JavaVersion.getJREs().stream().filter(javaVersion -> javaVersion.getParsedVersion() == JavaVersion.JAVA_8).findAny();
             if (java8.isPresent()) {
                 setting.setJavaVersion(java8.get());
-                Controllers.dialog(i18n("launch.advice.java9"), i18n("message.warning"), MessageBox.WARNING_MESSAGE, onAccept);
             } else {
                 Controllers.dialog(i18n("launch.advice.java9"), i18n("message.error"), MessageBox.ERROR_MESSAGE, null);
+                flag = true;
+            }
+        }
+
+        // Minecraft 1.13 may crash when generating world on Java 8 earlier than 1.8.0_51
+        VersionNumber JAVA_8 = VersionNumber.asVersion("1.8.0.51");
+        if (!flag && gameVersion.compareTo(VersionNumber.asVersion("1.13")) >= 0 && java.getParsedVersion() == JavaVersion.JAVA_8 && java.getVersionNumber().compareTo(JAVA_8) < 0) {
+            Optional<JavaVersion> java8 = JavaVersion.getJREs().stream()
+                    .filter(javaVersion -> javaVersion.getVersionNumber().compareTo(JAVA_8) >= 0)
+                    .max(Comparator.comparing(JavaVersion::getVersionNumber));
+            if (java8.isPresent()) {
+                setting.setJavaVersion(java8.get());
+            } else {
+                Controllers.dialog(i18n("launch.advice.java8_51_1_13"), i18n("message.warning"), MessageBox.WARNING_MESSAGE, onAccept);
+                flag = true;
             }
-            flag = true;
         }
 
         if (!flag && java.getPlatform() == org.jackhuang.hmcl.util.Platform.BIT_32 &&
@@ -257,6 +278,7 @@ public final class LauncherHelper {
             Controllers.dialog(i18n("launch.advice.different_platform"), i18n("message.error"), MessageBox.ERROR_MESSAGE, onAccept);
             flag = true;
         }
+
         if (!flag && java.getPlatform() == org.jackhuang.hmcl.util.Platform.BIT_32 &&
                 setting.getMaxMemory() > 1.5 * 1024) {
             // 1.5 * 1024 is an inaccurate number.
@@ -264,6 +286,7 @@ public final class LauncherHelper {
             Controllers.dialog(i18n("launch.advice.too_large_memory_for_32bit"), i18n("message.error"), MessageBox.ERROR_MESSAGE, onAccept);
             flag = true;
         }
+        
         if (!flag && OperatingSystem.TOTAL_MEMORY > 0 && OperatingSystem.TOTAL_MEMORY < setting.getMaxMemory()) {
             Controllers.dialog(i18n("launch.advice.not_enough_space", OperatingSystem.TOTAL_MEMORY), i18n("message.error"), MessageBox.ERROR_MESSAGE, onAccept);
             flag = true;

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

@@ -47,6 +47,7 @@ public final class VersionsPage extends StackPane implements WizardPage, Refresh
     private final DownloadProvider downloadProvider;
     private final String libraryId;
     private final String title;
+    private final Runnable callback;
 
     @FXML
     private JFXListView<VersionsPageItem> list;
@@ -55,6 +56,8 @@ public final class VersionsPage extends StackPane implements WizardPage, Refresh
     @FXML
     private StackPane failedPane;
     @FXML
+    private StackPane emptyPane;
+    @FXML
     private JFXCheckBox chkRelease;
     @FXML
     private JFXCheckBox chkSnapshot;
@@ -74,6 +77,7 @@ public final class VersionsPage extends StackPane implements WizardPage, Refresh
         this.gameVersion = gameVersion;
         this.downloadProvider = downloadProvider;
         this.libraryId = libraryId;
+        this.callback = callback;
         this.versionList = downloadProvider.getVersionListById(libraryId);
 
         FXUtils.loadFXML(this, "/assets/fxml/download/versions.fxml");
@@ -123,8 +127,12 @@ public final class VersionsPage extends StackPane implements WizardPage, Refresh
                 List<VersionsPageItem> items = loadVersions();
 
                 Platform.runLater(() -> {
-                    list.getItems().setAll(items);
-                    transitionHandler.setContent(centrePane, ContainerAnimations.FADE.getAnimationProducer());
+                    if (items.isEmpty()) {
+                        transitionHandler.setContent(emptyPane, ContainerAnimations.FADE.getAnimationProducer());
+                    } else {
+                        list.getItems().setAll(items);
+                        transitionHandler.setContent(centrePane, ContainerAnimations.FADE.getAnimationProducer());
+                    }
                 });
             } else {
                 Platform.runLater(() -> {
@@ -150,4 +158,7 @@ public final class VersionsPage extends StackPane implements WizardPage, Refresh
     private void onRefresh() {
         refresh();
     }
+
+    @FXML
+    private void onBack() { callback.run(); }
 }

HMCL/src/main/resources/assets/fxml/download/versions.fxml

@@ -20,4 +20,7 @@
     <StackPane fx:id="failedPane">
         <Label onMouseClicked="#onRefresh" style="-fx-text-fill: #0079FF; -fx-font-size: 20;" text="%download.failed.refresh" />
     </StackPane>
+    <StackPane fx:id="emptyPane">
+        <Label onMouseClicked="#onBack" style="-fx-text-fill: #0079FF; -fx-font-size: 20;" text="%download.failed.empty" />
+    </StackPane>
 </fx:root>

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

@@ -83,6 +83,7 @@ crash.user_fault=Your OS or Java environment may not be properly installed resul
 download=Download
 download.BMCL=BMCLAPI (bangbang93, https://bmclapi2.bangbang93.com/)
 download.failed=Failed to download
+download.failed.empty=No candidates. Click here to return.
 download.failed.refresh=Unable to load version list. Click here to retry.
 download.mojang=Mojang
 
@@ -134,6 +135,7 @@ lang.default=Use system language
 
 launch.advice.different_platform=Your OS is 64-Bit but your Java is 32-Bit. The 64-Bit Java is recommended.
 launch.advice.java8_1_13=Minecraft 1.13 and later versions can only run on Java 8 or later.
+launch.advice.java8_51_1_13=Minecraft 1.13 may crash on Java 8 earlier than 1.8.0_51. You are supposed to install the latest version of Java 8.
 launch.advice.java9=You cannot launch Minecraft until game version is higher than 1.13 with Java 9 or later Java versions.
 launch.advice.newer_java=Java 8 is suggested, which can make game run more fluently. And many mods and Minecraft 1.12 and newer versions requires Java 8.
 launch.advice.not_enough_space=You have allocated too much memory, because the physical memory size is %dMB, your game probably crash. The launcher will try to launch it.

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

@@ -83,6 +83,7 @@ crash.user_fault=您的系統或 Java 環境可能安裝不當導致本軟件崩
 download=下載
 download.BMCL=BMCLAPI（bangbang93，https://bmclapi2.bangbang93.com/）
 download.failed=下載失敗
+download.failed.empty=沒有可供安裝的版本，點擊此處返回。
 download.failed.refresh=加載版本列表失敗，點擊此處重試。
 download.mojang=官方
 
@@ -134,6 +135,7 @@ lang.default=跟隨系統語言
 
 launch.advice.different_platform=您的系統是 64 位的但是 Java 是 32 位的，推薦您安裝 64 位 Java。
 launch.advice.java8_1_13=Minecraft 1.13 只支持 Java 8 或更高版本，請使用 Java 8 或最新版本。
+launch.advice.java8_51_1_13=舊於 1.8.0_51 的 Java 可能會導致 Minecraft 1.13 崩潰。建議您到 https://java.com 安裝最新版的Java 8。
 launch.advice.java9=不高於 1.13 的安裝了 Mod 的 Minecraft 不支持 Java 9 或更高版本，請使用 Java 8。
 launch.advice.newer_java=檢測到您未使用 Java 8 及更新版本，Java 8 能使遊戲更流暢而且 Minecraft 1.12 及更新版本和很多 Mod 強制需要需要 Java 8。
 launch.advice.not_enough_space=您設置的內存大小過大，由於超過了系統內存大小 %dMB，所以可能影響遊戲體驗或無法啓動遊戲，啓動器仍會嘗試啓動。

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

@@ -83,6 +83,7 @@ crash.user_fault=您的系统或 Java 环境可能安装不当导致本软件崩
 download=下载
 download.BMCL=BMCLAPI（bangbang93，https://bmclapi2.bangbang93.com/）
 download.failed=下载失败
+download.failed.empty=没有可供安装的版本，点击此处返回。
 download.failed.refresh=加载版本列表失败，点击此处重试。
 download.mojang=官方
 
@@ -134,6 +135,7 @@ lang.default=跟随系统语言
 
 launch.advice.different_platform=您的系统是 64 位的但是 Java 是 32 位的，推荐您安装 64 位 Java。
 launch.advice.java8_1_13=Minecraft 1.13 只支持 Java 8 或更高版本，请使用 Java 8 或最新版本。
+launch.advice.java8_51_1_13=旧于 1.8.0_51 的 Java 可能会导致 Minecraft 1.13 崩溃。建议您到 https://java.com 安装最新版的 Java 8。
 launch.advice.java9=不高于 1.13 的安装了 Mod 的 Minecraft 不支持 Java 9 或更高版本，请使用 Java 8。
 launch.advice.newer_java=检测到您未使用 Java 8 及更新版本，Java 8 能使游戏更流畅而且 Minecraft 1.12 及更新版本和很多 Mod 强制需要需要 Java 8。
 launch.advice.not_enough_space=您设置的内存大小过大，由于超过了系统内存大小 %dMB，所以可能影响游戏体验或无法启动游戏，启动器仍会尝试启动。

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

@@ -65,7 +65,6 @@ public class DefaultDependencyManager extends AbstractDependencyManager {
     public Task checkGameCompletionAsync(Version version) {
         return new ParallelTask(
                 new GameAssetDownloadTask(this, version),
-                new GameLoggingDownloadTask(this, version),
                 new GameLibrariesTask(this, version)
         );
     }

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

@@ -55,7 +55,6 @@ public class DefaultGameBuilder extends GameBuilder {
             variables.set("version", version);
             Task result = new ParallelTask(
                     new GameAssetDownloadTask(dependencyManager, version),
-                    new GameLoggingDownloadTask(dependencyManager, version),
                     downloadGameAsync(gameVersion, version),
                     new GameLibrariesTask(dependencyManager, version) // Game libraries will be downloaded for multiple times partly, this time is for vanilla libraries.
             ).with(new VersionJsonSaveTask(dependencyManager.getGameRepository(), version)); // using [with] because download failure here are tolerant.

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

@@ -73,8 +73,7 @@ public abstract class VersionList<T extends RemoteVersion> {
     private Collection<T> getVersionsImpl(String gameVersion) {
         lock.readLock().lock();
         try {
-            Collection<T> ans = versions.get(gameVersion);
-            return ans.isEmpty() ? versions.values() : ans;
+            return versions.get(gameVersion);
         } finally {
             lock.readLock().unlock();
         }

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

@@ -1,72 +0,0 @@
-/*
- * Hello Minecraft! Launcher.
- * Copyright (C) 2018  huangyuhui <[email protected]>
- * 
- * 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 {http://www.gnu.org/licenses/}.
- */
-package org.jackhuang.hmcl.download.game;
-
-import org.jackhuang.hmcl.download.DependencyManager;
-import org.jackhuang.hmcl.game.DownloadType;
-import org.jackhuang.hmcl.game.LoggingInfo;
-import org.jackhuang.hmcl.game.Version;
-import org.jackhuang.hmcl.task.FileDownloadTask;
-import org.jackhuang.hmcl.task.Task;
-import org.jackhuang.hmcl.util.NetworkUtils;
-
-import java.io.File;
-import java.util.Collection;
-import java.util.LinkedList;
-import java.util.List;
-
-/**
- * This task is to download log4j configuration file provided in minecraft.json.
- *
- * @author huangyuhui
- */
-public final class GameLoggingDownloadTask extends Task {
-
-    private final DependencyManager dependencyManager;
-    private final Version version;
-    private final List<Task> dependencies = new LinkedList<>();
-
-    /**
-     * Constructor.
-     *
-     * @param dependencyManager the dependency manager that can provides {@link org.jackhuang.hmcl.game.GameRepository}
-     * @param version the <b>resolved</b> version
-     */
-    public GameLoggingDownloadTask(DependencyManager dependencyManager, Version version) {
-        this.dependencyManager = dependencyManager;
-        this.version = version;
-        setSignificance(TaskSignificance.MODERATE);
-    }
-
-    @Override
-    public Collection<Task> getDependencies() {
-        return dependencies;
-    }
-
-    @Override
-    public void execute() {
-        if (version.getLogging() == null || !version.getLogging().containsKey(DownloadType.CLIENT))
-            return;
-
-        LoggingInfo logging = version.getLogging().get(DownloadType.CLIENT);
-        File file = dependencyManager.getGameRepository().getLoggingObject(version.getId(), version.getAssetIndex().getId(), logging);
-        if (!file.exists())
-            dependencies.add(new FileDownloadTask(NetworkUtils.toURL(logging.getFile().getUrl()), file));
-    }
-
-}

HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java

@@ -47,7 +47,7 @@ public class DefaultLauncher extends Launcher {
         super(repository, versionId, authInfo, options, listener, daemon);
     }
 
-    private CommandBuilder generateCommandLine(File nativeFolder, boolean enableLoggingInfo) throws IOException {
+    private CommandBuilder generateCommandLine(File nativeFolder) throws IOException {
         CommandBuilder res = new CommandBuilder();
 
         // Executable
@@ -70,16 +70,6 @@ public class DefaultLauncher extends Launcher {
                 res.add("-Xdock:icon=" + repository.getAssetObject(version.getId(), version.getAssetIndex().getId(), "icons/minecraft.icns").getAbsolutePath());
             }
 
-            Map<DownloadType, LoggingInfo> logging = version.getLogging();
-            if (logging != null && enableLoggingInfo) {
-                LoggingInfo loggingInfo = logging.get(DownloadType.CLIENT);
-                if (loggingInfo != null) {
-                    File loggingFile = repository.getLoggingObject(version.getId(), version.getAssetIndex().getId(), loggingInfo);
-                    if (loggingFile.exists())
-                        res.add(loggingInfo.getArgument().replace("${path}", loggingFile.getAbsolutePath()));
-                }
-            }
-
             if (OperatingSystem.CURRENT_OS != OperatingSystem.WINDOWS)
                 res.add("-Duser.home=" + options.getGameDir().getParent());
 
@@ -252,7 +242,7 @@ public class DefaultLauncher extends Launcher {
         File nativeFolder = Files.createTempDirectory("minecraft").toFile();
 
         // To guarantee that when failed to generate launch command line, we will not call pre-launch command
-        List<String> rawCommandLine = generateCommandLine(nativeFolder, isEnablingLoggingInfo()).asList();
+        List<String> rawCommandLine = generateCommandLine(nativeFolder).asList();
 
         decompressNatives(nativeFolder);
 
@@ -304,50 +294,17 @@ public class DefaultLauncher extends Launcher {
                 writer.write(options.getPreLaunchCommand());
                 writer.newLine();
             }
-            writer.write(generateCommandLine(nativeFolder, false).toString());
+            writer.write(generateCommandLine(nativeFolder).toString());
         }
         if (!scriptFile.setExecutable(true))
             throw new PermissionException();
     }
 
-    protected boolean isEnablingLoggingInfo() {
-        return version.getLogging() != null && version.getLogging().containsKey(DownloadType.CLIENT)
-                && !"net.minecraft.launchwrapper.Launch".equals(version.getMainClass());
-    }
-
     private void startMonitors(ManagedProcess managedProcess, ProcessListener processListener) {
         startMonitors(managedProcess, processListener, true);
     }
 
     private void startMonitors(ManagedProcess managedProcess, ProcessListener processListener, boolean isDaemon) {
-        if (isEnablingLoggingInfo())
-            startMonitorsWithLoggingInfo(managedProcess, processListener, isDaemon);
-        else
-            startMonitorsWithoutLoggingInfo(managedProcess, processListener, isDaemon);
-    }
-
-    private void startMonitorsWithLoggingInfo(ManagedProcess managedProcess, ProcessListener processListener, boolean isDaemon) {
-        processListener.setProcess(managedProcess);
-        Log4jHandler logHandler = new Log4jHandler((line, level) -> {
-            processListener.onLog(line, level);
-            managedProcess.addLine(line);
-        });
-        logHandler.start();
-        managedProcess.addRelatedThread(logHandler);
-        Thread stdout = Lang.thread(new StreamPump(managedProcess.getProcess().getInputStream(), logHandler::newLine), "stdout-pump", isDaemon);
-        managedProcess.addRelatedThread(stdout);
-        Thread stderr = Lang.thread(new StreamPump(managedProcess.getProcess().getErrorStream(), it -> {
-            processListener.onLog(it + OperatingSystem.LINE_SEPARATOR, Log4jLevel.ERROR);
-            managedProcess.addLine(it);
-        }), "stderr-pump", isDaemon);
-        managedProcess.addRelatedThread(stderr);
-        managedProcess.addRelatedThread(Lang.thread(new ExitWaiter(managedProcess, Arrays.asList(stdout, stderr), (exitCode, exitType) -> {
-            logHandler.onStopped();
-            processListener.onExit(exitCode, exitType);
-        }), "exit-waiter", isDaemon));
-    }
-
-    private void startMonitorsWithoutLoggingInfo(ManagedProcess managedProcess, ProcessListener processListener, boolean isDaemon) {
         processListener.setProcess(managedProcess);
         Thread stdout = Lang.thread(new StreamPump(managedProcess.getProcess().getInputStream(), it -> {
             processListener.onLog(it + OperatingSystem.LINE_SEPARATOR, Optional.ofNullable(Log4jLevel.guessLevel(it)).orElse(Log4jLevel.INFO));

HMCLCore/src/main/java/org/jackhuang/hmcl/launch/Log4jHandler.java

@@ -1,180 +0,0 @@
-/*
- * Hello Minecraft! Launcher.
- * Copyright (C) 2018  huangyuhui <[email protected]>
- * 
- * 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 {http://www.gnu.org/licenses/}.
- */
-package org.jackhuang.hmcl.launch;
-
-import org.jackhuang.hmcl.task.Schedulers;
-import org.jackhuang.hmcl.util.*;
-import org.xml.sax.Attributes;
-import org.xml.sax.InputSource;
-import org.xml.sax.SAXException;
-import org.xml.sax.XMLReader;
-import org.xml.sax.helpers.DefaultHandler;
-import org.xml.sax.helpers.XMLReaderFactory;
-
-import java.io.IOException;
-import java.io.InterruptedIOException;
-import java.io.PipedInputStream;
-import java.io.PipedOutputStream;
-import java.text.SimpleDateFormat;
-import java.util.Date;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Optional;
-import java.util.concurrent.Future;
-import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.function.BiConsumer;
-import java.util.logging.Level;
-
-/**
- * This class is to parse log4j classic XML layout logging,
- * since only vanilla Minecraft will enable this layout.
- *
- * Also supports plain logs.
- *
- * @author huangyuhui
- */
-final class Log4jHandler extends Thread {
-
-    private final XMLReader reader;
-    private final BiConsumer<String, Log4jLevel> callback;
-    private final PipedOutputStream outputStream = new PipedOutputStream();
-    private final PipedInputStream inputStream = Lang.invoke(() -> new PipedInputStream(outputStream));
-    private final AtomicBoolean interrupted = new AtomicBoolean(false);
-    private final List<String> logs = new LinkedList<>();
-    private boolean broken = false;
-
-    public Log4jHandler(BiConsumer<String, Log4jLevel> callback) {
-        this.callback = callback;
-        newLine("<output>");
-
-        reader = Lang.invoke((ExceptionalSupplier<XMLReader, SAXException>) XMLReaderFactory::createXMLReader);
-        reader.setContentHandler(new Log4jHandlerImpl());
-    }
-
-    @Override
-    public void run() {
-        setName("log4j-handler");
-
-        try {
-            InputSource inputSource = new InputSource(inputStream);
-            reader.parse(inputSource);
-        } catch (InterruptedIOException e) {
-            // Game has been interrupted.
-            interrupted.set(true);
-        } catch (SAXException | IOException e) {
-            Logging.LOG.log(Level.WARNING, "An error occurred when reading console lines", e);
-        }
-    }
-
-    public void onStopped() {
-        if (interrupted.get())
-            return;
-
-        Lang.invoke(() -> Schedulers.newThread().schedule(() -> {
-            if (!interrupted.get()) {
-                newLine("</output>").get();
-                outputStream.close();
-                join();
-            }
-        }).get());
-    }
-
-    public Future<?> newLine(String log) {
-        return Schedulers.computation().schedule(() -> {
-            try {
-                // Prevent from namespace parsing
-                String line = log.replace("log4j:", "log4j_");
-                logs.add(line);
-                if (broken)
-                    System.out.println(line);
-
-                byte[] bytes = (line + OperatingSystem.LINE_SEPARATOR).getBytes(Constants.SYSTEM_CHARSET);
-                outputStream.write(bytes);
-                outputStream.flush();
-            } catch (IOException e) {
-                // Ignoring IOException, including read end dead.
-                if (!broken) {
-                    Logging.LOG.log(Level.WARNING, "An error occurred when writing console lines", e);
-                    logs.forEach(System.out::println);
-                    broken = true;
-                } else {
-                    // Output plain XML to user
-                    callback.accept(log, Log4jLevel.INFO);
-                }
-            }
-        });
-    }
-
-    private class Log4jHandlerImpl extends DefaultHandler {
-
-        private final SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
-
-        private String date = "", thread = "", logger = "";
-        private StringBuilder message;
-        private Log4jLevel level;
-        private boolean readingMessage = false;
-
-        @Override
-        public void startElement(String uri, String localName, String qName, Attributes attributes) {
-            switch (localName) {
-                case "log4j_Event":
-                    message = new StringBuilder();
-                    Date d = new Date(Long.parseLong(attributes.getValue("timestamp")));
-                    date = format.format(d);
-                    try {
-                        level = Log4jLevel.valueOf(attributes.getValue("level"));
-                    } catch (IllegalArgumentException e) {
-                        level = Log4jLevel.INFO;
-                    }
-                    thread = attributes.getValue("thread");
-                    logger = attributes.getValue("logger");
-                    if ("STDERR".equals(logger))
-                        level = Log4jLevel.ERROR;
-                    break;
-                case "log4j_Message":
-                    readingMessage = true;
-                    break;
-                case "log4j_Throwable":
-                    break;
-            }
-        }
-
-        @Override
-        public void endElement(String uri, String localName, String qName) {
-            switch (localName) {
-                case "log4j_Event":
-                    callback.accept("[" + date + "] [" + thread + "/" + level.name() + "] [" + logger + "] " + message.toString(), level);
-                    break;
-                case "log4j_Message":
-                    readingMessage = false;
-                    break;
-            }
-        }
-
-        @Override
-        public void characters(char[] ch, int start, int length) {
-            String line = new String(ch, start, length);
-            if (line.trim().isEmpty())
-                return;
-            if (readingMessage)
-                message.append(line).append(OperatingSystem.LINE_SEPARATOR);
-            else
-                callback.accept(line, Optional.ofNullable(Log4jLevel.guessLevel(line)).orElse(Log4jLevel.INFO));
-        }
-    }
-}

HMCLCore/src/main/java/org/jackhuang/hmcl/util/JavaVersion.java

@@ -63,6 +63,10 @@ public final class JavaVersion {
         return platform;
     }
 
+    public VersionNumber getVersionNumber() {
+        return VersionNumber.asVersion(longVersion.replace('_',  '.'));
+    }
+
     /**
      * The major version of Java installation.
      *