Failed to start the minecraft server java.lang.IllegalArgumentException: Unsupported class file major version 63

[trillos999]

Hi everyone !, I have a minecraft 1.18.2 server with 15 mods. A couple of days ago I updated to Windows 11, and I have had this recurring error, I have tried to reinstall the forge server with all versions of java JDK (17, 18 and 19)(also i try to start the old server with the same java versions but nothing happens). But with none of the three I have been able to overcome this error, I appreciate any help or idea to solve it!, thanks!

(The server runs smoothly when I don't include the mods)

 

D:\User\Desktop\Server>REM Forge requires a configured set of both JVM and program arguments.

D:\User\Desktop\Server>REM Add custom JVM arguments to the user_jvm_args.txt

D:\User\Desktop\Server>REM Add custom program arguments {such as nogui} to this file in the next line before the  or

D:\User\Desktop\Server>REM  pass them to this script directly

D:\User\Desktop\Server>java @user_jvm_args.txt @libraries/net/minecraftforge/forge/1.18.2-40.1.76/win_args.txt
2022-10-10 17:20:20,957 main WARN Advanced terminal features are not available in this environment
[17:20:21] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher running: args [--launchTarget, forgeserver, --fml.forgeVersion, 40.1.76, --fml.mcVersion, 1.18.2, --fml.forgeGroup, net.minecraftforge, --fml.mcpVersion, 20220404.173914, -nogui]
[17:20:21] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher 9.1.3+9.1.3+main.9b69c82a starting: java version 19 by Oracle Corporation
[17:20:21] [main/INFO] [op.OptiFineTransformationService/]: OptiFineTransformationService.onLoad
[17:20:21] [main/INFO] [op.OptiFineTransformationService/]: OptiFine ZIP file URL: union:/D:/User/Desktop/Server/mods/OptiFine-1.18.2_HD_U_H9_pre1.jar%2339!/
[17:20:21] [main/INFO] [op.OptiFineTransformationService/]: OptiFine ZIP file: D:\User\Desktop\Server\mods\OptiFine-1.18.2_HD_U_H9_pre1.jar
[17:20:21] [main/INFO] [op.OptiFineTransformer/]: Target.PRE_CLASS is available
[17:20:21] [main/INFO] [mixin/]: SpongePowered MIXIN Subsystem Version=0.8.5 Source=union:/D:/User/Desktop/Server/libraries/org/spongepowered/mixin/0.8.5/mixin-0.8.5.jar%2314!/ Service=ModLauncher Env=SERVER
[17:20:21] [main/INFO] [op.OptiFineTransformationService/]: OptiFineTransformationService.initialize
[17:20:22] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file D:\User\Desktop\Server\libraries\net\minecraftforge\fmlcore\1.18.2-40.1.76\fmlcore-1.18.2-40.1.76.jar is missing mods.toml file
[17:20:22] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file D:\User\Desktop\Server\libraries\net\minecraftforge\javafmllanguage\1.18.2-40.1.76\javafmllanguage-1.18.2-40.1.76.jar is missing mods.toml file
[17:20:22] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file D:\User\Desktop\Server\libraries\net\minecraftforge\lowcodelanguage\1.18.2-40.1.76\lowcodelanguage-1.18.2-40.1.76.jar is missing mods.toml file
[17:20:22] [main/WARN] [ne.mi.fm.lo.mo.ModFileParser/LOADING]: Mod file D:\User\Desktop\Server\libraries\net\minecraftforge\mclanguage\1.18.2-40.1.76\mclanguage-1.18.2-40.1.76.jar is missing mods.toml file
[17:20:23] [main/INFO] [ne.mi.fm.lo.mo.JarInJarDependencyLocator/]: Found 1 dependencies adding them to mods collection
[17:20:23] [main/INFO] [op.OptiFineTransformationService/]: OptiFineTransformationService.transformers
[17:20:23] [main/INFO] [op.OptiFineTransformer/]: Targets: 359
[17:20:24] [main/INFO] [op.OptiFineTransformationService/]: additionalClassesLocator: [optifine., net.optifine.]
[17:20:26] [main/INFO] [mixin/]: Compatibility level set to JAVA_17
[17:20:26] [main/INFO] [cp.mo.mo.LaunchServiceHandler/MODLAUNCHER]: Launching target 'forgeserver' with arguments [-nogui]
[17:20:26] [main/ERROR] [minecraft/Main]: Failed to start the minecraft server
java.lang.IllegalArgumentException: Unsupported class file major version 63
        at org.objectweb.asm.ClassReader.<init>(ClassReader.java:199) ~[asm-9.2.jar:?] {}
        at org.objectweb.asm.ClassReader.<init>(ClassReader.java:180) ~[asm-9.2.jar:?] {}
        at org.objectweb.asm.ClassReader.<init>(ClassReader.java:166) ~[asm-9.2.jar:?] {}
        at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:75) ~[modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50) ~[modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.cl.ModuleClassLoader.getMaybeTransformedClassBytes(ModuleClassLoader.java:245) ~[securejarhandler-1.0.3.jar:?] {}
        at cpw.mods.modlauncher.TransformingClassLoader.buildTransformedClassNodeFor(TransformingClassLoader.java:58) ~[modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.TransformerClassWriter.computeHierarchyFromFile(TransformerClassWriter.java:149) ~[modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.TransformerClassWriter.computeHierarchy(TransformerClassWriter.java:112) ~[modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.TransformerClassWriter.getSupers(TransformerClassWriter.java:83) ~[modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.TransformerClassWriter.getCommonSuperClass(TransformerClassWriter.java:66) ~[modlauncher-9.1.3.jar%235!/:?] {}
        at org.objectweb.asm.SymbolTable.addMergedType(SymbolTable.java:1202) ~[asm-9.2.jar:?] {}
        at org.objectweb.asm.Frame.merge(Frame.java:1299) ~[asm-9.2.jar:?] {}
        at org.objectweb.asm.Frame.merge(Frame.java:1197) ~[asm-9.2.jar:?] {}
        at org.objectweb.asm.MethodWriter.computeAllFrames(MethodWriter.java:1610) ~[asm-9.2.jar:?] {}
        at org.objectweb.asm.MethodWriter.visitMaxs(MethodWriter.java:1546) ~[asm-9.2.jar:?] {}
        at org.objectweb.asm.tree.MethodNode.accept(MethodNode.java:769) ~[asm-tree-9.2.jar:?] {}
        at org.objectweb.asm.tree.MethodNode.accept(MethodNode.java:649) ~[asm-tree-9.2.jar:?] {}
        at org.objectweb.asm.tree.ClassNode.accept(ClassNode.java:452) ~[asm-tree-9.2.jar:?] {}
        at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:133) ~[modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50) ~[modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:110) ~[securejarhandler-1.0.3.jar:?] {}
        at cpw.mods.cl.ModuleClassLoader.lambda$findClass$16(ModuleClassLoader.java:216) ~[securejarhandler-1.0.3.jar:?] {}
        at cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:226) ~[securejarhandler-1.0.3.jar:?] {}
        at cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:216) ~[securejarhandler-1.0.3.jar:?] {}
        at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:132) ~[securejarhandler-1.0.3.jar:?] {}
        at java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[?:?] {}
        at net.minecraft.server.Main.main(Main.java:104) ~[server-1.18.2-20220404.173914-srg.jar%2353!/:?] {re:classloading}
        at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?] {}
        at java.lang.reflect.Method.invoke(Method.java:578) ~[?:?] {}
        at net.minecraftforge.fml.loading.targets.CommonServerLaunchHandler.lambda$launchService$0(CommonServerLaunchHandler.java:32) ~[fmlloader-1.18.2-40.1.76.jar%2317!/:?] {}
        at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-9.1.3.jar%235!/:?] {}
        at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149) [bootstraplauncher-1.0.0.jar:?] {}

 

[warjort]

Use java 17

[trillos999]

3 minutes ago, warjort said:

Use java 17

I already tried it, it doesn't work

[warjort]

"It doesn't work" is not an answerable question.

[warjort]

I do so see you trying to use optifine on the server which is pointless. All it will do is potentially break things there. 🙂
 

Edited October 10, 2022 by warjort

[trillos999]

8 minutes ago, warjort said:

I do so see you trying to use optifine on the server which is pointless. All it will do is potentially break things there. 🙂
 

 

I managed to solve the java problem by deleting all the versions and using a "jarfix" file to solve the interferences. But definitely the optifine was the problem. Thank you so much !, I had 3 days with this, u save me.