Recursively list every class in every jar:
The Happens-Before relationship is rarely properly understood, but is a vital part to parallel, or multi-threaded, programming. It explains the “how could that happen” problem that can happen with multiple running threads.
I recently had to put in place a public facing soap web service with Spring and WS-Security. While the tutorials on Spring Source are great, if you requirements deviate from the sample tutorials it is difficult to track down any extra information needed.