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The basic rule to remember is that the name element in stateless, stateful, and message-driven annotations is the same as the ejb-name element in the descriptor. If you do not specify the name element with these annotations, the name of the bean class is understood to be the ejb-name element. This means that when you are overriding an annotation setting with your deployment descriptor, the ejb-name element must match the bean class name.
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Suppose we have a stateless session bean that uses these annotations:
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@Stateless(name = "BazaarAdmin") public class BazaarAdminBean implements BazaarAdmin { ... @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW) public Item addItem() { } }
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The value for the name element specified is BazaarAdmin, which is the same as the value of the ejb-name element specified in the deployment descriptor:
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<ejb-name>BazaarAdmin</ejb-name>
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If you do not specify the name element, the container will use the name of BazaarAdminBean as the name of the bean class, and in order to override annotations you have to use that name in the deployment descriptor:
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<ejb-name>BazaarAdminBean</ejb-name>
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We used @TransactionAttribute to specify that the transaction attribute for a bean method be REQUIRES_NEW. If we want to override it to use REQUIRED,1 then we use the following descriptor:
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Keep in mind the impact of changing a transaction attribute from RequiresNew to Required, as shown in this example. We investigated this effect in greater detail in chapter 6.
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Packaging session and message-driven beans
<assembly-descriptor> <container-transaction> <method> Specifies ejb-name <ejb-name>BazaarAdmin</ejb-name> <method-name>getUserWithItems</method-name> <method-params></method-params> </method> <trans-attribute>Required</trans-attribute> Changes transaction </container-transaction> attribute setting </assembly-descriptor>
In this example, we used the assembly-descriptor element to specify a transaction attribute C. In addition, the ejb-name element b in the assemblydescriptor matches the original name specified with the @Stateless annotation in the bean class.
11.3.4 Specifying default interceptor settings
Interceptors (as you ll recall from chapter 5) allow you to implement cross-cutting code in an elegant manner. An interceptor can be defined at the class or method level, or a default interceptor can be defined at the module level for all EJB classes in the EJB -JAR. We mentioned that default interceptors for an EJB module can only be defined in the deployment descriptor (ejb-jar.xml). Listing 11.4 shows how to specify default interceptors for an EJB module.
Listing 11.4 Default interceptor setting in ejb-jar.xml
... Defines interceptor binding <interceptor-binding> <ejb-name>*</ejb-name> Applies binding to all EJBs <interceptor-class> actionbazaar.buslogic.CheckPermissionInterceptor </interceptor-class> <interceptor-class> actionbazaar.buslogic.ActionBazaarDefaultInterceptor </interceptor-class> </interceptor-binding> ...
The interceptor-binding b tag defines the binding of interceptors to a particular EJB with the ejb-name element. If we want to define the default interceptor or an interceptor binding for all EJBs in the EJB module, then we can specify * as the value for ejb-name C. We specify a class to use as the interceptor with the <interceptor-class> tag. As evident from the listing, you can specify multiple
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interceptors in the same binding, and the order in which they are specified in the deployment descriptor determines the order of execution for the interceptor. In our example, CheckPermissionInterceptor will be executed prior to ActionBazaarDefaultInterceptor when any EJB method is executed. If you want a refresher on how interceptors work, make a quick detour back to chapter 5 and then rejoin us here. We ll wait
11.3.5 Using vendor-specific annotations and descriptors
We ve already explained that stateless session beans and MDBs may be pooled. In addition, you can configure passivation for stateful session beans, and you can set up the handling of poisonous messages for MDBs. However, we have not discussed configuration details for either of these scenarios. Unfortunately, these configurations are left to the vendors as proprietary features, and they can be supported with proprietary annotations, proprietary deployment descriptors, or both. Table 11.4 lists the name of the deployment descriptor file for some popular application servers.
Table 11.4 Vendor-specific deployment descriptors for popular application servers Application Server BEA WebLogic IBM WebSphere JBoss Oracle Application Server Sun GlassFish Vendor-Specific Deployment Descriptor weblogic-ejb-jar.xml ibm-ejb-jar.xml jboss.xml orion-ejb-jar.xml sun-ejb-jar.xml
Many developers shun deployment descriptors as a matter of inconvenience. Application server vendors will continue to provide support for annotations that match deployment descriptor elements, as developers voice their preference for these features. Chances are that each vendor has a set of proprietary annotations to set configuration information with the code. For example, you can use the oracle.j2ee.ejb.StatelessDeployment proprietary annotation to provide configuration information such as pooling and transaction management for stateless session beans. Look at the following code, which configures pooling with Oracle s proprietary annotation:
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