Minecraft - Server will not start

Technical Support
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1

System Information

Field Value
Operating System Windows - Windows 10 Pro on x86_64
Product AMP ‘Phobos’ v2.6.0.12 (Mainline)
Virtualization None
Application Minecraft
Module MinecraftModule
Running in Container No
Current State Failed

Problem Description

Issue

This is the console error. “Exception in thread “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 52.0”

How can I fix this?
Thank you!

Reproduction Steps

  • Ive reinstalled java and the instance to the latest versions.
  • Ive tried with the default settings.
  • I have nothing else running
2

You have Java 8 selected, and that version needs Java 21 to run.
Install Java 21 on your system, stop/start the instance to refresh the Java runtimes list, then select Java 21.
https://adoptium.net/temurin/releases/?version=21&os=windows

3

Thank you! I am grateful for the assistance.

1 Like
4

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