Batch decompiling of Java files with JD-GUI

Question

I\'m looking for a program to batch decompile Java classes. I found JAD, but it didn\'t support some new features of Java, and the benefit of this program is that it can exe

Answer 1

It looks like you can launch the GUI with a whole bunch of libs at once using the command line and then CTRL+ALT+s/CTRL+w each tab to quickly save/close. It's not automated but tolerable when decompiling a pile of dependencies. (Note that the "^" is just a trick for doing multi-line commands in Windows.)

"c:\jd-gui-0.3.6.windows\jd-gui.exe" ^
 c:\my-libs\lib-a.jar ^
 c:\my-libs\lib-b.jar ^
 c:\my-libs\lib-c.jar ^
 c:\my-libs\lib-d.jar ^
 c:\my-libs\lib-e.jar

Answer 2

File > Save all sources will save all files in the home directory.

Answer 3

Command line decompilation for JD-GUI is a highly requested feature but it's not implemented yet. Perhaps you can use the following workaround in the meantime:

1. jar (or zip) all the classes you want decompiled together.
2. Launch JD-GUI and open your jar (zip) archive.
3. Use "File" - "Save JAR Sources" menu option. It will decompile all classes from your archive and save their sources into another zip file.

I haven't seen any good open source JD-GUI alternatives with command-line support, unfortunately, so I think the above is as good as it gets for now.

Answer 4

I could recommend using Jad in conjuction with JadRetro - of course, it can't make Jad produce java generics but the decompiled source (including for Java 1.5+ classes) is functionally equivalent to the original (and back compilable in most cases).
Its use is simple:

jadretro *.class
jad .class

Notes:
1. JadRetro could be used in batch mode like this: jadretro ...
2. If you are using jad v1.5.8e (instead of the latest v1.5.8g) then "-c" option should be passed to jadretro (otherwise jad will refuse to decompile Java 1.5+ classes).