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In chapter 9 we showed you how to group entities as a persistence unit and how to configure that unit using persistence.xml. Now that you know how to package entities, it s time to learn more about persistence.xml, the descriptor that transforms any JAR module into a persistence module. It s worth mentioning that persistence.xml is the only mandatory deployment descriptor that you have to deal with. We hope the Java EE specification will ease this requirement in future releases of the specification. At the time of this writing, some EJB containers such as Oracle and JBoss support proprietary extensions of persistence modules without persistence.xml in EJB -JAR modules. Although user-friendly, this feature will not be portable across EJB 3 containers. You can find the schema for persistence.xml online at http:// java.sun.com/xml/ns/persistence/persistence_1_0.xsd. Listing 11.6 is an example of a simple persistence.xml that we can use with the ActionBazaar application; it should successfully deploy to any Java EE 5 container that supports JPA. The first thing the file does is define a persistence unit and package it to your deployment archive for example, WAR or EJB -JAR.

} created and found catch(Exception e){ e.printStackTrace(); System.out.println("Failed Finding Entity:"+e.getMessage()); } } private TestEntity createEntity(String txt, TestEntityHome home) throws ObjectNotFoundException, Creates the test CreateException,RemoteException { TestEntity entity = null; Integer id = null; System.out.println("Creating Entity with ID: "+txt); entity = (TestEntity) PortableRemoteObject.narrow( home.create(txt), TestEntity.class); id = entity.getEntityId(); System.out.println("Created Entity with ID: "+id.intValue()); return entity; } private TestEntity findEntity(Integer id, TestEntityHome home) throws ObjectNotFoundException, FinderException, Finds the test CreateException, RemoteException {

<persistence> <persistence-unit name = "actionBazaar" Persistence unit transaction-type = "JTA"> <provider> Factory class for JPA provider oracle.toplink.essentials.PersistenceProvider </provider>

Packaging EJB 3 applications DataSource used by <jta-data-source>jdbc/ActionBazaarDS persistence unit </jta-data-source> <mapping-file>secondORMap.xml</mapping-file> <jar-file>entities/ShippingEntities.jar</jar-file> Entity classes <class>ejb3inaction.persistence.Category</class> included in unit <class>ejb3inaction.persistence.Bid</class>.

Let s run through a quick review of the code before we drill down into the details. We define a persistence unit by using the persistence-unit element b. We can specify an optional factory class for the persistence provider c. The JPA provider connects to the database to store retrieved entities; we specified the data source for the persistence provider d. If you have multiple persistence units in a single archive, you may want to identify the entity classes that comprise the persistence unit e. Optionally, you can specify vendor-specific configuration using the properties element f. We hope you re ready for a detailed exploration on the use of each of the elements in persistence.xml from listing 11.6 you ll find it pretty straightforward. After reading the next few pages, you should be fairly comfortable with this new part of the EJB standard. Naming the persistence unit Each persistence unit must have a name, and that name must be unique across the Java EE module. The name is important because the container uses it to create an entity manager factory, and then again to create the entity manager instances using the factory to access the entities specified inside the unit. Also, you access the persistence unit by using its name when you attempt to perform CRUD operations with the entities packaged in the module. All other elements in a persistence unit can be defaulted. You can define more than one persistence unit for an application module in persistence.xml. All entities identified in a persistence unit are managed by a single set of entity instances. Thus, a persistence.xml may have multiple persistence units in a particular JAR module as follows: