How to go about RE Java Plugins for Intellij?

[alexei]

Originally Posted by byte23

Hello fellow Enthusiasts,

I want to ask a very straightforward question. All my RE has been limited to x86/x64 windows applications using the usual tools IDA and/or X64Dbg.

Now my question is, what is the best way to go about reverse-engineering Plugins for Intellij?

There are several Plugins I would like to modify, many have 30 Day-Trials for example and I can imagine there are possibilities there.

Im really not sure how to go about doing this. Do I need some sort of decompiler? Since the plugins run through Intellij this could be an additional barrier.

I will say sorry in advance if this is a beginners question

Many thanks

These are the repos I commonly use:
https://github.com/TerriblePanda/JByteMod-Reborn
https://github.com/GraxCode/threadtear
https://github.com/java-deobfuscator/deobfuscator

they have their various strengths. DM if you need further resource(s).