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

@@ -501,14 +501,11 @@ public class LaunchCommandBuilder {
         boolean isForgeLike = "forge".equals(loaderType) || "neoforge".equals(loaderType);
 
         for (VersionManifest.Library lib : manifest.getAllLibraries()) {
-            // For Forge/NeoForge: skip Minecraft client libraries — they're loaded
-            // through Forge's own module system (securejarhandler + module path).
-            // Having them on the classpath creates automatic modules that conflict
-            // with Forge's own module layer (split-package ResolutionException).
-            if (isForgeLike && lib.name.startsWith("net.minecraft:")) {
-                System.out.println(ZAnsi.cyan("  Skipping Minecraft lib (loaded via module system): " + lib.name));
-                continue;
-            }
+            // For Forge/NeoForge: include ALL libraries including net.minecraft:*
+            // in the classpath string. Forge version.json uses "-p ${classpath}" to
+            // set BOTH classpath and module path to the same string. The Minecraft
+            // client JAR must be on the module path so securejarhandler can load it
+            // as a proper module. Skipping it causes ClassNotFoundException.
             Path libPath = lib.artifactPath != null ? librariesDir.resolve(lib.artifactPath) : null;
             if (libPath != null && Files.exists(libPath)) {
                 if (isValidJar(libPath)) {