Since in SECA 5, the EJB part has been moved from EJB 2.0 to 3.0.
EJB 3.0 has no entity bean, so do we need to get the knowledge of entity bean or The new Java Persistence API (JPA)? Thanks.
You'll definitely need to know a bit about the Java Persistence API. A little knowledge of the benefits and drawbacks of JPA, especially when compared to EJB2.x, will help you greatly.