I am having some issues starting an RLCraft server on a minimal install of Debian 12.

I have Java installed and I'm able to start the vanilla Minecraft server jar no problem and people can join and play without any issues, as soon as I try to create a new directory with the Forge jar the initial install with the INSTALLER jar works when I use the java command with the --installServer flag, but as soon as I try to start the server using the forge jar that is NOT labelled with installer I get the following error:

A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:569)
        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.<init>(Launch.java:34)
        at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
        ... 6 more

 

I have tried using newer versions of Java directly from Oracle as well. Has anybody been successful in starting and running a RLCraft server from the terminal on a Linux machine? I cannot figure out why it doesn't want to work but the vanilla jar works without issue.

Thank you in advance!

Edited December 6, 2024Dec 6 by Gala0111

1.12.2 requires Java 8 (JRE)

 

That seems to have fixed it, thank you!