DJ Java Decompiler
Full user review
Decompiled my exact code
None. There was no problem at all.
I accidentally lost my .java file (due to a weird dropbox glitch) after I had already compiled and tested it. I needed to turn it in for homework ASAP. This wonderful program brought back my whole file, comments and all. I was worried it wouldn't when a post online said it would get "some" of the file back. It was complete. Run on Windows 7 Ultimate x64.