How to modify jar w/o source?

[Konrad Billewicz]

Hi,

I have an old Java application (jar file). I would like to make some
modifications in it but I don't have the source code. :-(

Do you know any solution for my problem? Both commercial and free
solutions are possible.

Best regards,
Konrad

 

[Manish Pandit]

Use JAD (http://www.kpdus.com/jad.html) to dis-assemble the .class
files in the jar. If there is no obfuscation you will get the source
code.

-cheers,
Manish