Startup Issue with Minecraft - i cant start the server

Technical Support
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1

System Information

Field Value
Operating System Linux - Debian GNU/Linux 11 on x86_64
Product AMP ‘Decadeus’ v2.4.6.4 (Mainline)
Virtualization QEMU_KVM
Application Minecraft
Module MinecraftModule
Running in Container No
Current State Failed

Problem Description

Issue

i tried making a rlcraft server but it wont start

Reproduction Steps

  • changed the server type to forge
  • change forge version for rlcraft
  • make mods folder
  • upload the rlcraft server pack to the folder
2

Double check that you’re using Java 8 under Configuration → Java and Memory
Otherwise shoot over your logs/latest.log and we’ll see what we can figure.

3

it says im using JDK 8 and where can i find the logs?

4

In the web File Manager as logs/latest.log

5

i only found AMP_Logs
and i found this in the console if this helps
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.(Launch.java:34)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

6

Oh getcha, the server wasn’t getting past the initial bit, so no logs to speak of.
My gut says that the Java runtime setting might be stuck.
Try switching it to Java 17 (or some other Java version), wait a few seconds, then swap it back to Java 8.

7

its working now. Thank you soo much!!

8

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