Profiling java applications for free seems to be just barely possible. VisualVM is buggy, hard to use, and has the smallest feature set I've seen in a profiler. It's considerably worse than the tools that Adobe provides for actionscript. (?!)
Anyway if you have a memory leak and you're all "dag yo, what could be hanging on to that reference?" and you refuse to pay for a good profiler, then here's how you can do it with VisualVM:
http://visualvm.java.net/heapdump.html
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