Jipe - Decompiler
The decompiler feature is not part of Jipe. It can be found in the Tools menu.
It works by running an external decompiler which you can specify from the Java Options dialog box found under Options - Java Options. The output from the external decompiler is sent directly to a newly created Java Document, and from there you can edit or save the document as required.
As I mentioned before, Jipe doesn't come with a decompiler. There are many decompilers on the market however if you are interested in this feature, try JAD it can be found at http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
If you use the above mentioned decompiler, then the Decompiler field in Java Options would have to include a -p at the end of the line: eg: 'c:\jdk1.2.2\bin\jad.exe -p'