Bug Description

Did this behavior use to work in the previous version?

Steps to Reproduce (for bugs)

Logs

• Client/Server Log:
  A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException
  at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:109)
  at java.base/java.lang.reflect.Method.invoke(Method.java:580)
  at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70)
  at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)
  Caused by: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
  at net.minecraft.launchwrapper.Launch.(Launch.java:34)
  at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
  at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)

• Crash Log:
  A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException
  at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:109)
  at java.base/java.lang.reflect.Method.invoke(Method.java:580)
  at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70)
  at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)
  Caused by: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
  at net.minecraft.launchwrapper.Launch.(Launch.java:34)
  at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
  at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
  ... 3 more

Client Information

• Modpack Version:
• Java Version:
• Launcher Used:
• Memory Allocated:
• Server/LAN/Single Player:
• Optifine Installed:
• Shaders Enabled:

World Information

• Modpack Version world created in:
• Additional Content Installed:

Server Information

• Java Version: 21
• Operating System: windows
• Hoster/Hosting Solution: I host on my computer
• Sponge (Non-Vanilla Forge) Server: forge

Thank you for the help!

You must use Java 8. This is a requirement of forge for 1.12.2.