I am trying to work on a jar file which I would like to fully decompile so I can understand some parts of the code.

This jar file contains several classes and a class is responsable for saving a temp file; I want to debug the jar file so I know which class is doing so.

On the internet I found that JADECLIPSE can do this however I am having trouble installing it.

I have followed all the steps posted in the following link

However when I press F3 on a class it says : Problem opening an editor
/foler/path/classname is not its project's build path.