Groovy has one of the nicest approaches to compile time metaprogramming (apart from Lisp, of course). I often wish it had gained more momentum before Clojure a

Groovy has one of the nicest approaches to compile time metaprogramming (apart from Lisp, of course). I often wish it had gained more momentum before Clojure and Scala showed up. The Java interoperation is much, much cleaner than in Jython or JRuby due to Groovy being a first class JVM language.