About this task
Step 2 towards the goal:
Implementing EJB 3.x applications
Procedure
Design a Java EE
application and the enterprise beans that it needs. Before developing
entity beans with CMP, read the topic, Concurrency control. Keep in
mind that EJB 3.x modules do not support entity beans. You must continue
to place entity beans in your EJB 2.x-level modules.