Ubuntu Minecraft Server java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader

Question

Im trying to run my modded mc server. It works on wondows but when I try to run it on ubuntu it gives me this error:

    saif@Saif-Ubuntu:~/Desktop/Minecraft Serv         


        

Answer 1

Forge, as i know right now, sadly only supports Java 8 Development Kits. Be sure that you're running JDK8 by typing java --version. Try uninstalling other versions or specify which version shall be used. I suggest reading this

Answer 2

I figured out how to switch java versions without uninstalling any: 'sudo update-alternatives --config java'

Thanks to Joseph Sible, Novarch, and Likqez for pushing me in the right direction.

Answer 3

This issue occurs when you don't use JDK 8, please try using it again, uninstall JDK 11 and check your JDK version with java -version.