I wouldn't say "not possible". Interoperability between java and groovy is quite good. It's to some degree true for clojure and scala -- two languages I haven't

I wouldn't say "not possible". Interoperability between java and groovy is quite good. It's to some degree true for clojure and scala -- two languages I haven't used myself yet. There are example snippets around in the Internet that demonstrate that a combination of groovy/scala/clojure/jruby is possible. So the situation isn't that bad.