Startup Issue with Minecraft - Minecraft server wont start

Technical Support
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1

System Information

Field Value
Operating System Linux - Debian GNU/Linux 13 on aarch64
Product AMP ‘Deimos’ v2.7.0.0 (Mainline)
Virtualization Podman
Application Minecraft
Module MinecraftModule
Running in Container Yes
Current State Failed

Problem Description

Issue

Keep getting "```vbnet
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 69.0), this version of the Java Runtime only recognizes class file versions up to 65.0


Reproduction Steps
--
 * set up server then it failed
 * tried again and failed
 * looked on google and found nothing
2

I had the same issue and fixed it by doing the following.

  1. Go to manage instance
  2. Go to Configuration → Minecraft → Java Version
  3. Change it from the one chosen to another in the dropdown (in my case change it from TEMURIN 25 to TEMURIN 21)
  4. wait for the setting to save.
  5. Change it back to the TEMURIN 25 setting.
  6. wait for the setting to save.
  7. Launch the server.

This worked with an exisiting server and as well as a new one.

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