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Element/Attribute Name name Description Name of the persistence unit. This name is used in applications to either inject or establish a reference to a persistence unit by using the @PersistenceContext and @PersistenceUnit annotations or the persistence-context-ref or persistence-unit-ref descriptor element in a client application. Transaction type used for the persistence unit. Possible values are JTA or RESOURCE_LOCAL.

This concern adds the following elements: A field that stores the UserTransaction object and allows it to be quickly accessed (line 3) The initialization of this field at the beginning of the transactional method (line 17) A call to begin, which indicates a transaction start (line 20) A call to commit to ask for the realization of the transaction (line 53) A rollback invocation to ask for the cancellation of the transaction in case of an error (line 57) In addition, we need to manage the exceptions that can be thrown by the transaction itself. Here, we handle them in a generic way.

public class MessageBean extends MessageBeanTemplate{ public void onMessage(Message msg) { //implementation not shown } }

persistence-unit subelements The following table describes all subelements of the persistence-unit element.

Element/Attribute Name provider jta-data-source Description Name of the factory class of the JPA provider. JTA DataSource that points to the database that contains underlying tables for the entities configured in the persistence unit. Non-JTA DataSource that points to the database that contains underlying tables for the entities configured in the persistence unit. A non-jta-resource will be used when transaction-type is RESOURCE_LOCAL. Name of the mapping file that contains O/R mapping info. Lists the additional JAR file that contains entities. Identifies entity classes. Entity classes must be annotated with the @Entity annotation. When set to true it will include entities included in the class element. A name-value pair of vendor-specific properties. Vendor-specific properties may include caching, automatic table creation directives, etc.

This file defines the O/R mapping metadata for entities. It overrides any mapping metadata defined using annotations. You can reference the XML schema for O/R mapping at http://java.sun.com/ xml/ns/persistence/orm_1_0.xsd. persistence-unit-metadata You can use persistence-unit-metadata to specify metadata for the persistence unit. Note that it is not just for mapping a file where it is specified. It has two elements: persistence-unit-defaults and metadata-complete. When the metadatacomplete element is set to true, any mappings using annotations will be ignored. This table lists all elements in the persistence-unit-defaults element.

As you can tell from the three examples, using a bean adapter class greatly reduces the size of the EJB class source file. By using adapter classes, you essentially factor out methods that are common to all EJBs of a certain type those methods that many of us just give trivial implementations. Each bean instance inherits these methods, and can provide its own implementation of specific methods if needed.