It should be possible, as the JPA is "just another jar file", vs something like EJB.
But you may be running in to class loader shenanigans if you're trying to access the Entities from your application rather than from your Realm jar.
But if everything is bundled together, I would think it would work.
[Message sent by forum member 'whartung' (whartung)]
http://forums.java.net/jive/thread.jspa?messageID=236273