A recent study by Java developer Raghu Kodali has shown that porting Sun’s Java EE tutorial application RosterApp from EJB 2.1 to EJB 3.0 resulted in more than a 50-percent reduction in code.

“What we’re doing in Java EE 7 is we are abstracting the semantics so they can be more widely applicable,” for example, to Managed Beans or CDI Beans, Gupta said in Java Spotlight.

Chapter 2 The second chapter of Java EE 6 Cookbook for Securing, Tuning, and Extending Enterprise Applications provides more detailed coverage of JPA 2.0 introduced in the initial chapter.