JRuby and Java objects

Please tell me if it is possible to do the following:

• create an instance of a specific class in Java
• pass it to JRuby to do something with it
• continue using the "modified" version in Java

May you provide a small working example?

EDIT: It turns out that embedding was the simplest way to achieve this. More information is available on Embedding JRuby.

This was the solution I used : Direct JRuby embedding