MultiMC fails to find RubyDung.class on Minecraft rd-20090515

[The-Only-E]

Operating System

Windows, Linux

Description of bug

MultiMC is trying to find "com.mojang.rubydung.RubyDung" but fails because the path is "com.mojang.minecraft.RubyDung" #5073 reported it over a year ago but it didn't get fixed.

Steps to reproduce

Launch Minecraft version rd-20090515 with MultiMC.

Suspected cause

MultiMC is trying to find a Java class file but the directory it's trying to access is wrong.

This issue is unique

• I have searched the issue tracker and did not find an issue describing my bug.

[The-Only-E]

Log: https://paste.ee/p/iGfIq

[Wolf68k]

Use Java 8. https://github.com/MultiMC/Launcher/wiki/Using-the-right-Java

[TacoGS]

The issue was found to be an error on our side. I will be pushing a hotfix out soon.

[The-Only-E]

Log using Java 8: https://paste.ee/p/hmWAB

[TacoGS]

The pull request should fix the original issue with the incorrect mainClass, and now, thanks to the discord users and Wolf68k you might even avoid the java error that would arise after the issue is fixed.

[The-Only-E]

The pull request should fix the original issue with the incorrect mainClass, and now, thanks to the discord users and Wolf68k you might even avoid the java error that would arise after the issue is fixed.

Your pull request will break the other 3 rd versions. I made a fork that fixes the error in the 7-year old file correctly.
My fork repository: https://github.com/The-Only-E/multimc-meta/tree/master
The static/Minecraft.json file: https://github.com/The-Only-E/multimc-meta/blob/master/static/minecraft.json