Hot to Retrieve Your Application From Google App Engine
Sometimes, just sometimes - once every 5 years - I need to reverse engineer my own binary because I've either FUbar'd the code or the code is lost to me. Don't care to explain why the latter is true this particular time, but it is true. I need a built version of an application so I can run it through a trust Java Decompiler like the trustworthy JAD tool. JAD tool hasn't correctly reverse current Java code since Java 1.5, but it does come close and it's far easier to simply clean that up (you can see the structure of the code, even if it isn't immediately obvious what to do to get it to compile again).