'EJB3 in Action' is one of the reference books when it comes to this important area of Java EE. The second edition covering EJB 3.2 has just been published.
Over the years, the EJB specification has come a long way and has been greatly simplified but nevertheless EJB is still a large specification to grasp. This book is a great (and up-to-date!) introduction to the EJB Component Model. The book goes beyond just introducing EJBs in details as it also explains technologies related to EJB such as CDI and JPA (the older amongst us will remember that EJB, back in the days, used to also handle persistence). The book has also a full chapter devoted to WebSocket, a new important Java EE 7 technology. The final chapter of the book is devoted to a critical, some time over looked, topics: testing.
This is not a pure theoretical book as it really gives 2 views, it first introduce and explains EJBs but also JPA, CDI, etc. The book then explain how to use EJBs and the other technologies, how to put them in action! All in all, a great book to add to any Java EE 7 bookshelf!
Disclaimer: 'EJB 3 in Action' was co-authored by our own Reza Rahman. But to be honest, I was already praising the first edition of the book when Reza wasn't yet working for Oracle.
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