Why and when to perform this task
The specification for Enterprise JavaBeans (EJB) 2.0 states that for Container Managed Persistence (CMP) during the ejbCreate, the container can create the representation of the entity in the database immediately, or defer it to a later time. When you choose the defer option, the runtime defers ejbCreate (or the equivalent database persistence request) until it is needed. This can be at the end of the transaction, or when a flush is needed for finders related to this EJB type. By doing this you can reduce two round trips for the newly created entity (insert and update) to one (insert).Steps for this task