JavaShark
Sniffer and knowledge sharing tool for java platform
JavaShark is a new way to view/trace/analyze JVM applications. It's like an advanced debugger with Groovy support. And the most important - now you can share your knowledge about any system with people around the world - just share your handlers(breakpoints) bundle. Just imagine - you connect to the remote JVM, attach handlers bundle and now you know much more than any logs could ever give you. It's free and open source under MIT license. All debug power is in your hands now in a handy and cool way.