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JRuby is an amazing bit of programming. It has managed to rise from its humble beginnings as a hobby project on SourceForge to the most viable third-party Ruby implementation currently available. As far as I am aware, JRuby is the only Ruby implementation other than MRI which is capable of running an unmodified Rails application. But JRuby’s innovation is not just limited to a rock-solid Ruby interpreter, it also provides tight integration between Java and Ruby.