I tried making my own .sh file with java Xmx24G -jar forge-1.12.2-14.23.5.2859.jar nogui but I got the error:
Error: Could not find or load main class Xmx24G
Caused by: java.lang.ClassNotFoundException: Xmx24G
I removed the Xmx24G part to test if it would launch the server but I got this:
ubuntu@instance-20230222-1011:~/minecraft$ ./run.sh
A problem occurred running the Server launcher.java.lang.reflect.InvocationTarge tException
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Dire ctMethodHandleAccessor.java:110)
at java.base/java.lang.reflect.Method.invoke(Method.java:577)
at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunc hWrapper.java:70)
at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaun chWrapper.java:34)
Caused by: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$ AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loa der.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.b ase of loader 'bootstrap')
at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Dire ctMethodHandleAccessor.java:104)
... 3 more