I found this and a few others by googling "jtable jruby":
http://groups.google.com/group/monkeybars/browse_thread/thread/bf034b7f645dc204

In general it should be mostly straightforward JI. Perhaps you can
just try it and see what happens?

On Sat, Jul 11, 2009 at 5:15 PM, Thiago
Freitas<thiagosistemas3 / gmail.com> wrote:
> Good Night friends,
>
> My names is Thiago and i am Brazilian, and my english is not a very
> good, rsrsrs, sorry. I'm having a problem for a popular jTable with
> jruby.
>
> What is a example of how to this?
>
>