Startup Issue with Minecraft - I cant start my minecraft server

System Information

Field Value
Operating System Linux - Debian GNU/Linux 11 on x86_64
Product AMP ‘Callisto’ v2.5.0.12 (Mainline)
Virtualization QEMU_KVM
Application Minecraft
Module MinecraftModule
Running in Container No
Current State Failed

Problem Description

Issue

I cant start my Minecraft server because of an error. It says:
“Error: LinkageError occurred while loading main class net.minecraft.bundler.Main
java.lang.UnsupportedClassVersionError: net/minecraft/bundler/Main has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0”

I cant find the Java Runtime anywhere. plz help.

Reproduction Steps

  • create standart server
  • change version
  • change some memory stuff
  • some extra customisation
  • Try to start but get error

Minecraft 1.20.6 needs Java 21
If you’re not running the instance with docker you need to install it yourself using the system’s package manager

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