This is a Java EE 6 / JEE6 tutorial book. The teaching revolves around hands on examples. It covers EJB 3, JSF 2, JPA and JMS. Although this book is a somewhat quick learning aid, it also discusses some basic theory. The discussion is built upon some step by step hands on examples, and a bit of story, usually in the beginning of each chapter. If you follow the book in earnest, you could be able to develop complete JEE 6 applications, involving EJB,JSF,JPA and JMS. It is unlikely to make you an expert. However it is much more than getting started, and for many simple tasks or projects on JEE 6, you may not need to buy another book on the subject.