[elad]

I started a (commercial) project with Rails, and eventually, when we needed some 3rd party libraries that Java provides moved to running it on top of JRuby.

Since then we've been getting the best of both worlds IMO - our code is more mixed now, where most is still Ruby based so it's fun, easy, simple and fast (to develop), but some things are done with Java - when it needs to run fast, or we can't find a comparable ruby library to do something.

In short, instead of Groovy, and in view of the rest of the comments here regarding its maturity, why not consider JRuby?