How can I decompile many jars at once?

Question

Well, I guess subject says it all :)

The ideal solution would find all jars within a certain folder (they might be in sub-folders), and write all the sources found into a single "src" directory, of course maintaing the package folders.

Concrete use case: decompile all Eclipse plugin jars

Answer 1

Download JAD Decompiler.

• Unjar all your jar files (using the command jar xvf) to some directory. Let's call this ${unjar.dir}.

• Create a directory for JAD to write out the decompiled sources. Let's call this ${target.dir}.

• Execute the following command:

    jad -o -r -sjava -d${target.dir} ${unjar.dir}/**/*.class

options are:

-o       - overwrite output files without confirmation
-r       - restore package directory structure
-s <ext> - output file extension (default: .jad)

Answer 2

http://java.decompiler.free.fr/