Net.juckel.osgirubytest is a project mainly written in JAVA and RUBY, it's free.
Test JRuby running within OSGi
Simple test app for running JRuby under OSGi and test classloading issues. For now, you must place a JRuby jar within extensions/plugins, set the target platform from the platform.target file, then run the net.juckel.osgijrubytest.id1 application.
Yes, I should make this a simple Pax Runner test or some such...