v1.0.16.0 — fix Zern-OBT asset index (1.20.1->5), JavaFX 23->23.0.1 (WebKit WebSocket fix), drop embedded JavaFX from jar (scope=provided), deliver JavaFX 23.0.1 via incremental update, JFXBridge for safe CLI fallback

launcher/bootstrap/src/main/java/me/sashegdev/zernmc/launcher/Bootstrap.java

@@ -394,9 +394,49 @@ public class Bootstrap {
         String summary = "Updated files: " + downloaded + ", skipped: " + skipped + ", failed: " + failed;
         if (staged > 0) summary += ", staged self-update: " + staged;
         log(summary);
+        
+        cleanStaleJavaFxJars(serverFiles);
+        
         log("Updated to v" + newVersion);
     }
     
+    /**
+     * Removes old lib/javafx/*-win.jar files that are no longer part of the
+     * server meta (e.g. the previous JavaFX 23 jars after an upgrade to
+     * 23.0.1). Keeping both would put two JARs exporting the same module on
+     * the --module-path, which breaks module resolution.
+     */
+    private static void cleanStaleJavaFxJars(Map<String, FileMeta> serverFiles) {
+        Path javafxDir = baseDir.resolve("lib").resolve("javafx");
+        if (!Files.isDirectory(javafxDir)) return;
+        
+        java.util.Set<String> keep = new java.util.HashSet<>();
+        for (String filePath : serverFiles.keySet()) {
+            String normalized = filePath.toLowerCase().replace("\\", "/");
+            if (normalized.startsWith("lib/javafx/") && normalized.endsWith("-win.jar")) {
+                keep.add(new File(filePath).getName().toLowerCase());
+            }
+        }
+        
+        try (java.util.stream.Stream<Path> stream = Files.list(javafxDir)) {
+            stream.filter(Files::isRegularFile)
+                  .filter(p -> {
+                      String name = p.getFileName().toString().toLowerCase();
+                      return name.endsWith("-win.jar") && !keep.contains(name);
+                  })
+                  .forEach(p -> {
+                      try {
+                          Files.delete(p);
+                          log("Removed stale JavaFX jar: " + p.getFileName());
+                      } catch (Exception e) {
+                          log("Warning: could not remove stale JavaFX jar " + p.getFileName() + " - " + e.getMessage());
+                      }
+                  });
+        } catch (Exception e) {
+            log("Warning: failed to scan JavaFX dir: " + e.getMessage());
+        }
+    }
+    
     private static boolean isSelfExe(String filePath) {
         String lower = filePath.toLowerCase().replace("\\", "/");
         return lower.equals("zernmc.exe") || lower.equals("zernmc-cli.exe")

launcher/launcher/pom.xml

@@ -61,32 +61,37 @@
         <dependency>
             <groupId>org.openjfx</groupId>
             <artifactId>javafx-controls</artifactId>
-            <version>23</version>
+            <version>23.0.1</version>
             <classifier>win</classifier>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.openjfx</groupId>
             <artifactId>javafx-web</artifactId>
-            <version>23</version>
+            <version>23.0.1</version>
             <classifier>win</classifier>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.openjfx</groupId>
             <artifactId>javafx-graphics</artifactId>
-            <version>23</version>
+            <version>23.0.1</version>
             <classifier>win</classifier>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.openjfx</groupId>
             <artifactId>javafx-base</artifactId>
-            <version>23</version>
+            <version>23.0.1</version>
             <classifier>win</classifier>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.openjfx</groupId>
             <artifactId>javafx-media</artifactId>
-            <version>23</version>
+            <version>23.0.1</version>
             <classifier>win</classifier>
+            <scope>provided</scope>
         </dependency>
         
         <!-- Test -->
@@ -235,27 +240,27 @@
                                 <!-- Копируем JavaFX модули в lib/javafx -->
                                 <mkdir dir="../../server/builds/lib/javafx"/>
                                 <copy todir="../../server/builds/lib/javafx" overwrite="true">
-                                    <fileset dir="${user.home}/.m2/repository/org/openjfx/javafx-controls/23">
+                                    <fileset dir="${user.home}/.m2/repository/org/openjfx/javafx-controls/23.0.1">
                                         <include name="*win.jar"/>
                                     </fileset>
                                 </copy>
                                 <copy todir="../../server/builds/lib/javafx" overwrite="true">
-                                    <fileset dir="${user.home}/.m2/repository/org/openjfx/javafx-graphics/23">
+                                    <fileset dir="${user.home}/.m2/repository/org/openjfx/javafx-graphics/23.0.1">
                                         <include name="*win.jar"/>
                                     </fileset>
                                 </copy>
                                 <copy todir="../../server/builds/lib/javafx" overwrite="true">
-                                    <fileset dir="${user.home}/.m2/repository/org/openjfx/javafx-base/23">
+                                    <fileset dir="${user.home}/.m2/repository/org/openjfx/javafx-base/23.0.1">
                                         <include name="*win.jar"/>
                                     </fileset>
                                 </copy>
                                 <copy todir="../../server/builds/lib/javafx" overwrite="true">
-                                    <fileset dir="${user.home}/.m2/repository/org/openjfx/javafx-web/23">
+                                    <fileset dir="${user.home}/.m2/repository/org/openjfx/javafx-web/23.0.1">
                                         <include name="*win.jar"/>
                                     </fileset>
                                 </copy>
                                 <copy todir="../../server/builds/lib/javafx" overwrite="true">
-                                    <fileset dir="${user.home}/.m2/repository/org/openjfx/javafx-media/23">
+                                    <fileset dir="${user.home}/.m2/repository/org/openjfx/javafx-media/23.0.1">
                                         <include name="*win.jar"/>
                                     </fileset>
                                 </copy>

launcher/launcher/src/main/java/sashegdev/zernmc/launcher/Main.java

@@ -50,7 +50,7 @@ public class Main {
 
     private static void launchJFX() {
         try {
-            System.setProperty("javafx.runtime.version", "21");
+            System.setProperty("javafx.runtime.version", "23.0.1");
             
             JFXLauncher.main(new String[]{});
         } catch (Exception e) {

launcher/launcher/src/main/java/sashegdev/zernmc/launcher/api/launch/LaunchService.java

@@ -6,7 +6,7 @@ import me.sashegdev.zernmc.launcher.minecraft.Instance;
 import me.sashegdev.zernmc.launcher.minecraft.InstanceManager;
 import me.sashegdev.zernmc.launcher.minecraft.launch.LaunchCommandBuilder;
 import me.sashegdev.zernmc.launcher.minecraft.model.LaunchOptions;
-import me.sashegdev.zernmc.launcher.ui.jfx.JFXLauncher;
+import me.sashegdev.zernmc.launcher.ui.jfx.JFXBridge;
 import me.sashegdev.zernmc.launcher.utils.Config;
 import me.sashegdev.zernmc.launcher.utils.LauncherLogger;
 
@@ -102,14 +102,14 @@ public class LaunchService {
                     String line;
                     while ((line = reader.readLine()) != null) {
                         String timestamped = "[" + java.time.LocalTime.now().format(java.time.format.DateTimeFormatter.ofPattern("HH:mm:ss")) + "] " + line;
-                        JFXLauncher.appendGameLog(line);
+                        JFXBridge.appendGameLog(line);
                         try {
                             logFileOut.write((timestamped + "\n").getBytes(java.nio.charset.StandardCharsets.UTF_8));
                             logFileOut.flush();
                         } catch (Exception ignored) {}
                     }
                 } catch (Exception e) {
-                    JFXLauncher.appendGameLog("[Error reading logs: " + e.getMessage() + "]");
+                    JFXBridge.appendGameLog("[Error reading logs: " + e.getMessage() + "]");
                 } finally {
                     try { logFileOut.close(); } catch (Exception ignored) {}
                 }
@@ -127,11 +127,11 @@ public class LaunchService {
                 try {
                     int exitCode = process.waitFor();
                     runningProcesses.remove(pid);
-                    JFXLauncher.appendGameLog("[Minecraft exited with code: " + exitCode + "]");
+                    JFXBridge.appendGameLog("[Minecraft exited with code: " + exitCode + "]");
                 } catch (InterruptedException e) {
                     Thread.currentThread().interrupt();
                 } catch (Exception e) {
-                    JFXLauncher.appendGameLog("[Error watching process: " + e.getMessage() + "]");
+                    JFXBridge.appendGameLog("[Error watching process: " + e.getMessage() + "]");
                 }
             }, "ProcessWatcher-" + instanceName);
             processWatcher.setDaemon(true);

launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/MinecraftLib.java

@@ -5,7 +5,7 @@ import me.sashegdev.zernmc.launcher.minecraft.installer.ModLoaderInstaller;
 import me.sashegdev.zernmc.launcher.minecraft.installer.VersionInstaller;
 import me.sashegdev.zernmc.launcher.minecraft.launch.LaunchCommandBuilder;
 import me.sashegdev.zernmc.launcher.minecraft.model.LaunchOptions;
-import me.sashegdev.zernmc.launcher.ui.jfx.JFXLauncher;
+import me.sashegdev.zernmc.launcher.ui.jfx.JFXBridge;
 import me.sashegdev.zernmc.launcher.utils.ConsoleUtils;
 import me.sashegdev.zernmc.launcher.utils.LauncherLogger;
 import me.sashegdev.zernmc.launcher.utils.ZAnsi;
@@ -141,10 +141,10 @@ public class MinecraftLib {
             try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
                 String line;
                 while ((line = reader.readLine()) != null) {
-                    JFXLauncher.appendGameLog(line);
+                    JFXBridge.appendGameLog(line);
                 }
             } catch (Exception e) {
-                JFXLauncher.appendGameLog("[Error reading output: " + e.getMessage() + "]");
+                JFXBridge.appendGameLog("[Error reading output: " + e.getMessage() + "]");
             }
         });
         outThread.setDaemon(true);
@@ -155,10 +155,10 @@ public class MinecraftLib {
             try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getErrorStream()))) {
                 String line;
                 while ((line = reader.readLine()) != null) {
-                    JFXLauncher.appendGameLog("[ERR] " + line);
+                    JFXBridge.appendGameLog("[ERR] " + line);
                 }
             } catch (Exception e) {
-                JFXLauncher.appendGameLog("[Error reading stderr: " + e.getMessage() + "]");
+                JFXBridge.appendGameLog("[Error reading stderr: " + e.getMessage() + "]");
             }
         });
         errThread.setDaemon(true);

launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/PackDownloader.java

@@ -250,7 +250,7 @@ public class PackDownloader {
             instance.setMinecraftVersion(manifest.getMinecraftVersion());
             instance.setLoaderType(manifest.getLoaderType());
             instance.setLoaderVersion(manifest.getLoaderVersion());
-            instance.setAssetIndex(manifest.getAssetIndex());
+            instance.setAssetIndex(resolveAssetIndex(manifest));
             
             reportProgress("Pack installed successfully!", 100, "Installing pack files", 4, 5);
             System.out.println(ZAnsi.brightGreen("Pack installed successfully!"));
@@ -300,7 +300,7 @@ public class PackDownloader {
             instance.setMinecraftVersion(manifest.getMinecraftVersion());
             instance.setLoaderType(manifest.getLoaderType());
             instance.setLoaderVersion(manifest.getLoaderVersion());
-            instance.setAssetIndex(manifest.getAssetIndex());
+            instance.setAssetIndex(resolveAssetIndex(manifest));
             
             System.out.println(ZAnsi.brightGreen("Pack installed successfully!"));
             LauncherLogger.info("installOrUpdatePack: SUCCESS");
@@ -771,6 +771,56 @@ public class PackDownloader {
         public boolean isEmpty() { return files == null || files.isEmpty(); }
     }
 
+    /**
+     * Resolve the correct asset index for the installed Minecraft version.
+     * The manifest/instance.json asset_index value may be wrong (e.g. Zern-OBT
+     * shipped "1.20.1" while the real index for MC 1.20.1 is "5"). The source of
+     * truth is the local Mojang version JSON downloaded during install
+     * (versions/<mc>/<mc>.json -> assetIndex.id). We only trust it when the
+     * corresponding index file actually exists on disk; otherwise fall back to
+     * the manifest value.
+     */
+    private String resolveAssetIndex(PackManifest manifest) {
+        String manifestIndex = manifest.getAssetIndex();
+        if (manifest == null || manifest.getMinecraftVersion() == null) {
+            return manifestIndex;
+        }
+        try {
+            Path versionJson = instance.getPath().resolve("versions")
+                    .resolve(manifest.getMinecraftVersion())
+                    .resolve(manifest.getMinecraftVersion() + ".json");
+            if (Files.exists(versionJson)) {
+                JsonObject versionData = JsonParser.parseString(Files.readString(versionJson)).getAsJsonObject();
+                String realIndex = null;
+                if (versionData.has("assetIndex") && versionData.get("assetIndex").isJsonObject()
+                        && versionData.getAsJsonObject("assetIndex").has("id")) {
+                    realIndex = versionData.getAsJsonObject("assetIndex").get("id").getAsString();
+                } else if (versionData.has("assets") && !versionData.get("assets").isJsonNull()) {
+                    realIndex = versionData.get("assets").getAsString();
+                }
+                if (realIndex != null && !realIndex.isEmpty()) {
+                    Path indexPath = instance.getPath().resolve("assets").resolve("indexes")
+                            .resolve(realIndex + ".json");
+                    if (Files.exists(indexPath)) {
+                        if (!realIndex.equals(manifestIndex)) {
+                            LauncherLogger.warn("resolveAssetIndex: manifest asset_index=" + manifestIndex
+                                    + " but real index=" + realIndex + " exists on disk, using real index");
+                        }
+                        return realIndex;
+                    } else {
+                        LauncherLogger.warn("resolveAssetIndex: real index=" + realIndex
+                                + " from version JSON, but " + indexPath + " does not exist; falling back to manifest=" + manifestIndex);
+                    }
+                }
+            } else {
+                LauncherLogger.warn("resolveAssetIndex: local version JSON not found: " + versionJson);
+            }
+        } catch (Exception e) {
+            LauncherLogger.warn("resolveAssetIndex: failed to resolve: " + e.getClass().getSimpleName() + " - " + e.getMessage());
+        }
+        return manifestIndex;
+    }
+
     public static class DiffResponse {
         private int version;
         private List<FileInfo> to_download;

launcher/launcher/src/main/java/sashegdev/zernmc/launcher/minecraft/launch/LaunchCommandBuilder.java

@@ -498,6 +498,29 @@ public class LaunchCommandBuilder {
             assetIndex = instance.getMinecraftVersion();
             System.out.println(ZAnsi.yellow("Asset index not found, using version: " + assetIndex));
         } else {
+            // Validate that the index file exists. A wrong/stale asset index
+            // (e.g. the Zern-OBT "1.20.1" bug, real index is "5") makes the game
+            // fail to load the base resource pack (grey panorama, no sounds).
+            Path indexPath = instance.getPath().resolve("assets").resolve("indexes").resolve(assetIndex + ".json");
+            if (!Files.exists(indexPath)) {
+                System.out.println(ZAnsi.yellow("Asset index file missing: " + assetIndex + ".json, searching for existing index..."));
+                try (java.util.stream.Stream<Path> stream = Files.list(instance.getPath().resolve("assets").resolve("indexes"))) {
+                    java.util.List<Path> existing = stream
+                            .filter(p -> p.getFileName().toString().endsWith(".json"))
+                            .sorted()
+                            .collect(java.util.stream.Collectors.toList());
+                    if (!existing.isEmpty()) {
+                        String found = existing.get(existing.size() - 1).getFileName().toString()
+                                .replace(".json", "");
+                        System.out.println(ZAnsi.green("Using existing asset index: " + found + " (was " + assetIndex + ")"));
+                        assetIndex = found;
+                    } else {
+                        System.out.println(ZAnsi.yellow("No asset index files found in assets/indexes/"));
+                    }
+                } catch (Exception e) {
+                    System.out.println(ZAnsi.yellow("Failed to search asset indexes: " + e.getMessage()));
+                }
+            }
             System.out.println(ZAnsi.green("Using asset index: " + assetIndex));
         }
         args.add(assetIndex);

launcher/launcher/src/main/java/sashegdev/zernmc/launcher/ui/jfx/JFXBridge.java

@@ -0,0 +1,81 @@
+package me.sashegdev.zernmc.launcher.ui.jfx;
+
+/**
+ * Safe reflection bridge to JFXLauncher for use from non-JFX code (CLI, menus,
+ * installers).
+ *
+ * IMPORTANT: JFXLauncher extends javafx.application.Application. In CLI mode
+ * JavaFX is NOT on the module path, so loading JFXLauncher (or any class that
+ * references JavaFX) throws NoClassDefFoundError (an Error, not an Exception).
+ * Therefore the bridge must catch Throwable and never let JFX-launcher errors
+ * leak into CLI/game-launch code paths.
+ *
+ * Rule: any call into JFX UI state from non-JFX context MUST go through this
+ * bridge. Direct JFXLauncher.x() calls are only allowed inside JFXLauncher.java.
+ */
+public final class JFXBridge {
+
+    private JFXBridge() {}
+
+    private static final String JFX_CLASS = "me.sashegdev.zernmc.launcher.ui.jfx.JFXLauncher";
+
+    private static volatile java.lang.reflect.Method appendGameLogMethod;
+    private static volatile java.lang.reflect.Method setInstallProgressMethod;
+    private static volatile java.lang.reflect.Method setInstallStageMethod;
+
+    private static java.lang.reflect.Method method(String name, Class<?>... params) {
+        java.lang.reflect.Method m = null;
+        try {
+            Class<?> clazz = Class.forName(JFX_CLASS);
+            m = clazz.getMethod(name, params);
+        } catch (Throwable t) {
+            // JavaFX not available (CLI mode) or JFXLauncher not initialized.
+        }
+        return m;
+    }
+
+    /** Forward a game log line to the JFX UI. Safe no-op in CLI mode. */
+    public static void appendGameLog(String msg) {
+        if (appendGameLogMethod == null) {
+            appendGameLogMethod = method("appendGameLog", String.class);
+        }
+        if (appendGameLogMethod == null) {
+            return;
+        }
+        try {
+            appendGameLogMethod.invoke(null, msg);
+        } catch (Throwable t) {
+            appendGameLogMethod = null;
+        }
+    }
+
+    /** Forward install progress to the JFX UI. Safe no-op in CLI mode. */
+    public static void setInstallProgress(String label, int current, int total) {
+        if (setInstallProgressMethod == null) {
+            setInstallProgressMethod = method("setInstallProgress", String.class, int.class, int.class);
+        }
+        if (setInstallProgressMethod == null) {
+            return;
+        }
+        try {
+            setInstallProgressMethod.invoke(null, label, current, total);
+        } catch (Throwable t) {
+            setInstallProgressMethod = null;
+        }
+    }
+
+    /** Forward install stage to the JFX UI. Safe no-op in CLI mode. */
+    public static void setInstallStage(String stageName, int stageIndex, int stageCount) {
+        if (setInstallStageMethod == null) {
+            setInstallStageMethod = method("setInstallStage", String.class, int.class, int.class);
+        }
+        if (setInstallStageMethod == null) {
+            return;
+        }
+        try {
+            setInstallStageMethod.invoke(null, stageName, stageIndex, stageCount);
+        } catch (Throwable t) {
+            setInstallStageMethod = null;
+        }
+    }
+}

launcher/launcher/src/main/java/sashegdev/zernmc/launcher/utils/ProgressBar.java

@@ -1,5 +1,7 @@
 package me.sashegdev.zernmc.launcher.utils;
 
+import me.sashegdev.zernmc.launcher.ui.jfx.JFXBridge;
+
 import java.text.DecimalFormat;
 
 public class ProgressBar {
@@ -14,11 +16,7 @@ public class ProgressBar {
         currentLabel = label;
         currentTotal = total;
         
-        try {
+        JFXBridge.setInstallProgress(label, (int) current, (int) total);
-            Class<?> jfxClass = Class.forName("me.sashegdev.zernmc.launcher.ui.jfx.JFXLauncher");
-            java.lang.reflect.Method setProgress = jfxClass.getMethod("setInstallProgress", String.class, int.class, int.class);
-            setProgress.invoke(null, label, (int) current, (int) total);
-        } catch (Exception ignored) {}
         
         if (total <= 0) {
             System.out.print("\r" + ZAnsi.cyan(label) + " ...");
@@ -40,11 +38,7 @@ public class ProgressBar {
         currentLabel = label;
         currentTotal = totalBytes;
         
-        try {
+        JFXBridge.setInstallProgress(label + " " + formatBytes(downloaded) + "/" + formatBytes(totalBytes), (int) downloaded, (int) totalBytes);
-            Class<?> jfxClass = Class.forName("me.sashegdev.zernmc.launcher.ui.jfx.JFXLauncher");
-            java.lang.reflect.Method setProgress = jfxClass.getMethod("setInstallProgress", String.class, int.class, int.class);
-            setProgress.invoke(null, label + " " + formatBytes(downloaded) + "/" + formatBytes(totalBytes), (int) downloaded, (int) totalBytes);
-        } catch (Exception ignored) {}
         
         if (totalBytes <= 0) {
             System.out.print("\r" + ZAnsi.cyan(label) + " ...");
@@ -71,11 +65,7 @@ public class ProgressBar {
         currentLabel = label;
         currentTotal = total;
         
-        try {
+        JFXBridge.setInstallProgress(label, (int) current, (int) (total > 0 ? total : 100));
-            Class<?> jfxClass = Class.forName("me.sashegdev.zernmc.launcher.ui.jfx.JFXLauncher");
-            java.lang.reflect.Method setProgress = jfxClass.getMethod("setInstallProgress", String.class, int.class, int.class);
-            setProgress.invoke(null, label, (int) current, (int) (total > 0 ? total : 100));
-        } catch (Exception ignored) {}
         
         if (total <= 0) {
             char[] spinner = {'|', '/', '-', '\\'};
@@ -92,11 +82,7 @@ public class ProgressBar {
     }
 
     public static void setStage(String stageName, int stageIndex, int stageCount) {
-        try {
+        JFXBridge.setInstallStage(stageName, stageIndex, stageCount);
-            Class<?> jfxClass = Class.forName("me.sashegdev.zernmc.launcher.ui.jfx.JFXLauncher");
-            java.lang.reflect.Method setStage = jfxClass.getMethod("setInstallStage", String.class, int.class, int.class);
-            setStage.invoke(null, stageName, stageIndex, stageCount);
-        } catch (Exception ignored) {}
     }
 
     public static void clearLine() {

launcher/pom.xml

@@ -18,8 +18,8 @@
     </modules>
 
     <properties>
-        <revision>1.0.15</revision>
+        <revision>1.0.16</revision>
-        <hotfix>3</hotfix>
+        <hotfix>0</hotfix>
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -74,31 +74,31 @@
             <dependency>
                 <groupId>org.openjfx</groupId>
                 <artifactId>javafx-controls</artifactId>
-                <version>23</version>
+                <version>23.0.1</version>
                 <classifier>win</classifier>
             </dependency>
             <dependency>
                 <groupId>org.openjfx</groupId>
                 <artifactId>javafx-web</artifactId>
-                <version>23</version>
+                <version>23.0.1</version>
                 <classifier>win</classifier>
             </dependency>
             <dependency>
                 <groupId>org.openjfx</groupId>
                 <artifactId>javafx-graphics</artifactId>
-                <version>23</version>
+                <version>23.0.1</version>
                 <classifier>win</classifier>
             </dependency>
             <dependency>
                 <groupId>org.openjfx</groupId>
                 <artifactId>javafx-base</artifactId>
-                <version>23</version>
+                <version>23.0.1</version>
                 <classifier>win</classifier>
             </dependency>
             <dependency>
                 <groupId>org.openjfx</groupId>
                 <artifactId>javafx-media</artifactId>
-                <version>23</version>
+                <version>23.0.1</version>
                 <classifier>win</classifier>
             </dependency>
         </dependencies>

server/main.py

@@ -1332,8 +1332,13 @@ def generate_launcher_builds_meta():
             rel_path = str(file_path.relative_to(BUILDS_DIR))
             
             # Only include runtime files needed for launcher updates
-            # Skip: JRE, JavaFX, old ZIPs, extracted versions, docs, root JARs
+            # Skip: JRE, old ZIPs, extracted versions, docs, root JARs.
-            if rel_path.startswith(("jre21/", "lib/", "lib-javafx/", "versions/", "libs/")):
+            # lib/javafx/*-win.jar IS included so existing clients get the
+            # JavaFX update (e.g. 23 -> 23.0.1 WebKit WebSocket fix) via the
+            # incremental updater, not only through a full ZIP reinstall.
+            if rel_path.startswith(("jre21/", "lib-javafx/", "versions/", "libs/", "logs/")):
+                continue
+            if rel_path.startswith("lib/") and not rel_path.startswith("lib/javafx/"):
                 continue
             if rel_path.endswith(".zip") or rel_path in ("README.txt", "build.version"):
                 continue