EJB 3 in Action
My wife usually gets berserk when I return from the book store. (Yet another book!) With this one it might be a bit easier, as I have it as PDF on my disk (a plus when searching in the content...).
Although EJB 3 in Action (Debu Panda, Reza Rahman, Derek Lane) adds 709 pages to your book shelf, these are worth the space and money.
Frankly, EJB 3 in Action is not the first book on EJB 3 and JPA, but it is certainly one of the best. Being suitable for different the entry levels (Beginner, Advanced, Migrators) it gives a gentle and smooth entry into EJB 3 and JPA. If you're used to EJB 2.1 you'll find a complete chapter just for migration to EJB 3, telling which road to go and pit-falls to avoid. If you've just implemented you're solution the book helps you to check your application for performance issues and advises how to solve them. The chapters on EJB 3 with Spring, Annotations Reference, and Deployment Descriptor Reference are a useful wrap-up of this fine book.
I really liked reading it because of the refreshing style of language and, more importantly, the chapter on Performance and Scalability as well as the Part Migration and Interoperability Issues. I'm a bit selfish here, because it proves useful to have a third opinion while suggesting solutions or advising for tuning, issue resolution, migration.
You might also read this review on Javalobby.org
