I would expect when I call tearDown on a ruby instance it would destroy any running ruby threads. Running threads however stay running which leads to memory leaks as the JVM will never GC objects with references in these running threads. This becomes a real issue when using servers such as torquebox that keep the same JVM running while destroying and creating ruby instances.

On a sidenote: I am looking for a way to get involved in the JRuby community. I have loved using JRuby for 2 years now and I am keen to give some of my time up to help out. I am having a bit of trouble figuring out where to start though. If this change is possible I would love it if some one could mentor me though this patch to get me started. Nothing too big just a quick chat session or even a 5 min skype call.