Duncan2 reviewsFollowFollowReadJanuary 4, 2012This book focuses on the persistence framework of EJB3: JPA. It offers an excellent treatment of this subject. It is detailed and clear.That being said, it is not a complete treatment of EJB3. For that I like the O'Reilly book by one of the JBoss leads. Enterprise JavaBeans 3.0 Paperback: 760 pages Publisher: O'Reilly Media, Inc.; 5 edition (May 16, 2006) Language: English ISBN-10: 059600978X ISBN-13: 978-0596009786The O'Reilly book and this Apress book complement each other.