Hi,

in case anyone else is eager to try out alternative JVM languages with 
ROS, this might interest you.

I created a couple of tutorials to rosjava for how to set up projects 
for use with Scala, Clojure and Groovy.
It turns out the basic compile and run is already well supported by the 
gradle tool, so the main hassle
remains in setting up your editor.

If anyone feels like it, feel free to complete / improve the tutorials, 
for now the only code examples I created was for a topic listener.

http://ros.org/wiki/rosjava_core/Tutorials

regards,
   Thibault