I have been spending a lot of time reading the jruby source code and I have no idea of how I can contribute so I thought I would start with the most simple contribution I could. I have added doco for one method. Not sure if this is any value for jruby or even if you accept pull requests this small however why not give it a go.
If this is of value I can start adding more comments as I attempt to understand the code base. Also tell me if my understanding of this method is correct. I can adjust the comment if need me. Thanks.
Updated doc for dumpThreads method in Runtime