JADClipse not working with Eclipse 3.6

I eventually found the answer here.

Running eclipse with -clean switch and setting the file association between *.class and the jadclipse plug-in solved the problem.

Set the JAD path correctly in Preferances>Java>Jad. Ex: D:\Jad\jad.exe

If still not working then,

Go to File extensions in Preferences. Select JadClipse as default editor for .class and .class with out source.

The main reason is that you eclipse have default class viewer configured for class file which you have to change to your new class decompiler.

go to preference > editor > choose "class without source" and select your tool and mark as default. will work for you :)