In fact it's not... Java JVM is a great piece of software it's extremely reliable and fast, the language is what sucks a bit ( I am a Java Dev btw ),If I rememb

In fact it's not... Java JVM is a great piece of software it's extremely reliable and fast, the language is what sucks a bit ( I am a Java Dev btw ),If I remember right Ruby IN THE PAST had some problems with concurrency, and that is were JRuby came from (correct me, if I am wrong... No flame wars please.), so reinventing the well takes time and sometimes goes wrong for a while. Some wikipedia: "JRuby supports interpreted mode, AOT mode, and JIT mode (the last two modes are available since version 1.1[19]). JRuby evolved from being several times slower than Ruby Reference implementation[32], to being several times faster.[33] [34]." I learned a bit of Scala and I think it's a awesome lang, if you have time to learn it properly otherwise it might to pull your blanket, because it's a little trick at some things. I would definetly like to work with it, in fact I plan use it in my next side project together with Backbone.js