FireStar are suing RedHat over patent violations in Hibernate. Since Hibernate forms the basis of parts of the EJB 3.0 spec, it would seem that this patent also covers all EJB 3 implementations. Scary.
What a load of rubbish!
I wonder why they didn't sue Oracle as well? For a history of TopLink, which dates back to 1994, see http://www.oracle.com/technology/tech/java/newsletter/articles/toplink/history_of_toplink.html