A good way to start is by this
There is then the one & only magical google that returns you :
search on Java Decompilers
There is first of all the JAD decompiler, which is embedded in many Commercial code Mocha is/was the very first one on the market. http://www.jascii.com NetBean has AFAIK a Java Decompiler @ the Forge, but I don't know what it's worth... I hope you can find your pleasure inthere ... !
Regards,
Thomas,
[ March 05, 2003: Message edited by: Thomas SMETS ]