I wasn’t way too interested in this project since I have about zero experience using Java, but it does seem like a great way to get even better Ruby exposure. JRuby is vastly different than IronRuby since it has been around for awhile and is much more mature. They showed off some very nice NetBeans IDE support for Ruby and dug a little into the internals. Interestingly it’s done in a similar fashion to IronRuby by being written in Java using attributes to markup the ruby classes and methods. They stuck to a 1:1 correlation for core classes which should make it easy to find what you are looking for, and something that I hope the IronRuby team does as well. They also covered some of the various optimizations they made and showed off some benchmarks.
-James
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