I purchased the latest edition of Allen and Barbara. I am very disappointed to see that the
EJB section is not updated for EJB 3. Even the practice exams has EJB 2 questions. The book is useful to study desgin
patterns. I had managed to barely pass
SCEA 4 with this book alone, but the exam has changed a lot now. You would need to look at various additional materials now and the above posts should help.