I am working on my server for the last 3 days but I can't resolve this problem

Technical Support
,
1

OS Name/Version:
Debian 11 with Game Panel

Product Name/Version: AMP Release “Decadeus”
v2.4.4, built 17/05/2023 17:54

Problem Description: I have tried installing my modpack in the file manager but every time I want to start the server it says that it cannot be run and I need to check the console for errors so I did some research but I just couldn’t figure out the cause of the problem I’m using JDK 8 for minecraft version 1.12.2 (14.23.5.2847) I will upload a picture of my filemanager and paste in the consoles error

errrr
errrr1432×887 147 KB

Console11:21:26
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:568)
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

Steps to reproduce:

  • Step 1 Install the modpack
  • Step 2 Choose said forge version
  • Step 3 Try to run server

Actions taken to resolve so far: I have tried placing the files in different folders under different names and tried to use different java versions.

2

Looks like the wrong java version is selected. Check what version your server needs and that this is the version selected in AMPs settings.

3

I read that 1.12.2 runs on Java 8 and I only have these options
image
or isn’t JDK 8 the same as Java 8?

4

Try changing it to another version then back to 8.

5

there’s no wayyyyyy thank you!!!
image
One last question. Should I Give My server the full 8Gigs of RAM or sould I leave a little excess

6

Assuming nothing else is on it, leave at least 512MB for the OS.

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