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Sugar or sugar substitute It s a matter of choice. Zero calories versus the risk of cancer The debate may well be endless, and the same applies to the debate between annotations and deployment descriptors. Some people find annotations elegant, while they see XML as verbose, ugly, and hard to maintain. Others find annotations unsightly, and complain that annotations complicate things by making configurations reside closer to the code. The good thing is that you have a choice, and Java EE allows you to override annotation settings in the code with deployment descriptors if you desire. We suggest you weigh the pros and cons of these options with a clear mind.

Although we won t delve deeply into deployment descriptors, let s look at some quick examples to see what deployment descriptors look like so that you can package a deployment descriptor in your EJB module if you need to. Listing 11.3 shows a simple example of a deployment descriptor for the BazaarAdmin EJB.

Table 9.1 The various assertXXX() methods that test methods can use to evaluate pass/fail conditions of tested business logic Method assertEquals() assertSame() assertFalse() assertTrue() assertNotNull() assertNotSame() assertNull() Description Many versions of this method exist to compare many types of objects and basic data types for equality. These methods test to see if two references point to the same object. Tests a condition for a false value. Tests a condition for a true value. Tests an object reference for a null value. Tests that two references point to different objects. Tests that a reference is a null value.

A new pointcut (here, called an advice binding) is declared (see line 4 in Listing 5-13). An interceptor class (myInterceptor) is associated with this pointcut (see line 5). Finally, the advice binding is registered with the aspect manager (see line 6). This functionality requires you to perform a so-called preparation phase. For JBoss AOP, this phase consists of transforming some selected application objects. These objects will then be ready to be aspectized in the future through the addBinding method. There are two ways of preparing application objects: You can use the <prepare> tag in an XML file. The tag takes a pointcut expression as a parameter. All the objects included in the pointcut will be prepared. You can associate the @Prepare annotation with a public static field of type Pointcut. As with the tag, a parameter for denoting the objects to be prepared is required. For example, the following XML code snippet <prepare expr="execution( Foo->*(..) )" /> prepares all the objects of the Foo class.

<ejb-jar version="3.0"> Specifies version element (must be 3.0) <enterprise-beans> <session> Identifies EJB <ejb-name>BazaarAdmin</ejb-name> <remote>actionbazaar.buslogic.BazaarAdmin</remote> <ejb-class>actionbazaar.buslogic.BazaarAdminBean</ejb-class> <session-type>stateless</session-type> Specifies <transaction-type>Container</transaction-type> bean type </session> Specifies </enterprise-beans> transaction type ... <assembly-descriptor> <container-transaction> Contains transaction attribute setting <method> <ejb-name>BazaarAdmin</ejb-name> <method-name>*</method-name> </method> <trans-attribute>Required</trans-attribute> </container-transaction> <security-role> <role-name>users</role-name> Specifies security setting </security-role> </assembly-descriptor> </ejb-JAR>

If you are familiar with EJB 2, you may have noticed that the only notable difference between this deployment descriptor and one in EJB 2 is that the version attribute must be set to 3.0, and the home element is missing because EJB 3 does not require a home interface. If you are using deployment descriptors for your EJBs, make sure that you set the ejb-jar version to 3.0 b because this will be used by the Java EE server to determine the version of the EJBs being packaged in an archive. The name element C identifies an EJB and is the same as the name element in the @Stateless annotation. These must match if you are overriding any values specified in the annotation with a descriptor. The session-type element D determines the type of session bean. This value can be either stateless or stateful. You can use transaction-type E to specify whether the bean uses CMT (Container) or BMT (Bean). The transaction, security, and other assembly details are set using the assembly-descriptor tag of the deployment descriptor F and G. Table 11.3 lists commonly used annotations and their corresponding descriptor tags. Note that as we mentioned earlier there is an element for every annotation. You will need only those which make sense for your development environment. Some of the descriptor elements you ll probably need are for resource references, interceptor binding, and declarative security. We encourage you to explore these on your own.

9.5 Creating a stateful session bean unit test 9.6 Creating an entity bean unit test 9.7 Automating test case execution 9.8 Executing test cases using a UI

Table 11.3 One-to-one mapping between annotations and XML descriptor elements Type EJB type name @Stateful EJB type Annotation Element Corresponding Descriptor Element <session-type>Stateless ejb-name <session-type>Stateful ejb-name @MessageDriven EJB type name @Remote @Local @TransactionManagement Interface type Interface type Transaction management type at bean level message-driven ejb-name remote local transaction-type