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Element/Attribute Name ejb-name Description A logical name for the MDB. This is the same as the name element of @MessageDriven annotation. A vendor-specific name for the bean. Name of the destination that MDB listens to. Primarily used for EJB 2 MDBs. Messaging type supported, i.e., message listener interface supported by the MDB. Web service endpoint interface for the EJB. Only applies to stateless beans. Name of the bean class. Transaction type used with the EJB, i.e., Bean or Container. Configuration property for an MDB. Specified using a namevalue pair using activation-config-property-name activation-config-property-value Similar to the @ActivationConfigProperty annotation.

In the context of J2EE, we use deployment descriptors (see the XML code in this section) to configure nonfunctional services that are managed by the container. This technique allows us, for example, to integrate transactions into the facade services or declaratively add persistence to business objects. It is also possible to configure the components to include remote access

The code in listings 1.6, 1.7, and 1.8 is similar to that in recipes 1.1 through 1.3. You should read those recipes for further details on using remote and local EJBs. When using EJBs from JSPs, keep in mind a few good development guidelines: For instance, if you need to contact an entity bean, it is generally accepted practice that you should do so through a session bean. A session facade to an entity bean can provide security for your data and help you improve the performance of your clients. In the same vein, consider wrapping your EJB access code in an object. This will insulate your JSP pages from unnecessary changes due to lookup code changes. Also, it adds a further layer of abstraction to your business logic (and persistence) layer.

Common elements for session and message-driven beans The following elements are commonly used with session and message-driven beans. ejb-local-ref Corresponding annotation: @javax.ejb.EJB Used to specify dependencies on local EJBs.

Element/Attribute Name ejb-ref-name Description The name used to bind the referenced EJB to the ENC. Same as the name element in the @EJB annotation. ejb-ref-name must be specified. The name of the target enterprise bean. This optional setting is used to link an EJB reference to a target enterprise bean. The EJB 3 local business interface. The EJB reference type, i.e., session. Target where the EJB reference is injected when dependency injection is used.

Element/Attribute Name ejb-ref-name Description The name used to bind the referenced EJB to the ENC. Same as the name element in the @EJB annotation. ejb-ref-name must be specified. The name of the target enterprise bean. This optional setting is used to link an EJB reference to a target enterprise bean. The EJB 3 remote business interface type. The EJB reference type, i.e., session . Target where the EJB reference is injected when dependency injection is used.

In addition, if your EJBs are using bean-managed transactions, take care to avoid starting transactions from the client layer. If a client should start a transaction and walk away, your application might be stuck with locked tables or corrupted data. Finally, as with the servlet example in the previous recipe, you should consider reading the property values passed in to the InitialContext object from a properties file (or similar mechanism). Doing this will improve the maintainability of your code.

features such as naming or declaring a remote interface, as well as features for managing rights. These solutions for automatic integration are referred to as declarative management or container-managed solutions. Listing 10-8 shows a section of the XML file ejb-jar.xml. Listing 10-8. The ejb-jar.xml File for Automatic Integration of Technical Services <enterprise-beans> <session> <description>no description</description> <display-name>BankEJB</display-name> <ejb-name>BankEJB</ejb-name> <home>aop.j2ee.business.session.bank.BankHome</home> <remote>aop.j2ee.business.session.bank.Bank</remote> <ejb-class>aop.j2ee.business.session.bank.BankBean</ejb-class> <session-type>Stateless</session-type> <transaction-type>Container</transaction-type> </session> </enterprise-beans> <assembly-descriptor> <security-role> <role-name>BankCustomer</role-name> </security-role> <security-role> <role-name>BankAdmin</role-name> </security-role> <container-transaction> <method> <ejb-name>BankEJB</ejb-name> <method-intf>Remote</method-intf> <method-name>getCustomersOfAccount</method-name> <method-params> <method-param>java.lang.String</method-param> </method-params> </method> <trans-attribute>Required</trans-attribute> </container-transaction> [...] Listing 10-9 shows a section of the XML file sun-ejb-jar.xml. Listing 10-9. The sun-ejb-jar.xml File for Naming and Access <sun-ejb-jar> <security-role-mapping> <role-name>BankCustomer</role-name>

resource-ref Corresponding annotation: @javax.annotation.Resource Used to specify resource references, e.g., data source, JMS connection factories, etc.

Description The name used to bind the referenced resource into the ENC. Same as the name element in the @Resource annotation. A vendor-specific global JNDI name for the referenced resource. Fully qualified class of the type of resource referenced, e.g., javax.sql.DataSource. Authentication type for the resource. Valid values are Container or Application. Specifies whether multiple beans can share the resource. Valid values are Shareable and Unshareable. Target where the referenced resource is injected when dependency injection is used.