By Mike Keith

Firm JavaBeans 3.0 (EJB 3.0) is an important element of the hot Java company variation five platform (previously referred to as J2EE). they're used for the advance and deployment of component-based firm enterprise purposes. Ever considering its first free up, EJB has been the topic of a lot media cognizance and no little controversy. EJBs signify a cosmopolitan and strong expertise and EJB-based purposes can help excessive numbers of transactions and clients, with greatest protection. although, prior incarnations of EJB have emerge as seemed through many as an excessively complicated expertise that may result in expensive and time-consuming ideas which are tricky to construct, enforce and continue. EJB three is determined to alter all that. It has made large advances in ease of improvement, and its enormously simplified programming version has been generally acclaimed and embraced. on the middle of the hot EJB three spec is a huge aid within the complexity of the EJB endurance and object-relational mapping mechanisms (essentially the entity beans component to the specification). This booklet offers the definitive consultant to the EJB three endurance know-how. The lead writer, Mike Keith, is a co-lead at the EJB 3.0 specialist crew (under JSR 220) and gives extraordinary perception and services in this subject. He and his co-authors dissect and clarify the recent EJB three patience specification in complete aspect, describing find out how to use this refined know-how to its complete strength. Assuming a easy wisdom of Java, SQL, JDBC and a few J2EE adventure, this publication teaches you EJB three endurance from the floor up. It offers the reader with a whole and in-depth figuring out of the EJB 3.0 patience API and the way to take advantage of it in perform.

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If the entity manager encounters a problem doing this, then it will throw an unchecked PersistenceException; otherwise the employee will be stored in the database. When the persist() call returns, emp will be a managed entity within the entity manager’s persistence context. Listing 2-3 shows how to incorporate this into a simple method that creates a new employee and persists it to the database. Listing 2-3. persist(emp); return emp; } This method assumes the existence of an entity manager in the em field of the instance and uses it to persist the Employee.

The configuration for an entity manager is bound to the EntityManagerFactory that created it, but it is defined separately as a persistence unit. A persistence unit dictates either implicitly or explicitly the settings and entity classes used by all entity managers obtained from the unique EntityManagerFactory instance bound to that persistence unit. There is, therefore, a one-to-one correspondence between a persistence unit and its concrete EntityManagerFactory. Persistence units are named to allow differentiation of one EntityManagerFactory from another.

Inheritance relationships between full-time and part-time employees Inheritance presents a genuine problem for object-relational mapping. We are no longer dealing with a situation where there is a natural mapping from a class to a table. Consider the relational models shown in Figure 1-6. Once again we demonstrate three different strategies for persisting the same set of data. Arguably the easiest solution for someone mapping an inheritance structure to a database would be to put all of the data necessary for each class (including parent classes) into separate tables.

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