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CHAPTER 5 BUSINESS SERVICES WITH JBOSS
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Stateless Session Beans
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For most Java EE applications, stateless session beans (SLSBs) have become the standard way to expose services provided by the middle tier. In combination with the Session Fa ade, Data Transfer Object (DTO), Command Pattern, and Data Access Object (DAO) design/implementation, patterns are one of the ways to define the functionality that our applications provide. In previous incarnations of the EJB specification we had so many moving parts that getting started with our projects became an exercise in drudgery. Luckily for us, in EJB 3.0 the path of least resistance has been chosen, and all we have to do to create an SLSB is to have a POJO that implements (at least one) POJI describing the services being provided. You could simply have a business interface Business.java and a bean implementation BusinessBean.java.
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Note The bean class may or may not implement a business interface although I recommend that you use interfaces to define the contracts between your application tiers and components. If you choose to not implement any business interfaces, a business interface will be dynamically generated using all the public methods. If only certain methods should be exposed in the business interface, all of those methods can be marked with the @BusinessMethod annotation.
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Once we have this contract in place, all we need to do is annotate the POJO class with the EJB3 annotation @Stateless. This will flag this class as an SLSB so that at deployment time the JBoss EJB3 container can provide our simple class with all the enterprise services. But in order to keep our interfaces free from any EJB-specific annotations, we can subclass the business interface in order to provide specific interfaces to serve as remote and local interfaces. To do this we can create two interfaces, named BusinessRemote.java and BusinessLocal.java, and annotate them with @javax.ejb.Remote and @javax.ejb.Local respectively. Following the trend of convention over configuration, JBoss will by default bind the bean to JNDI by using the fully qualified name of the interfaces as the JNDI name, which makes the code more robust and simple by allowing JNDI lookups to simply use the getName() method of the Class object for a given interface, for example, BusinessRemote.class.getName();. In order for our session bean to be properly handled, it must be first deployed. In JBoss 4, EJB3 non-persistent components are packaged in a familiar JAR archive with the extension .ejb3. There are no precompiling steps at build time; all enhancements are handled at deployment time by the JBoss EJB3 Deployer. Figure 5-7 shows a high-level view of the structure and features of the EJB3 specification.
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CHAPTER 5 BUSINESS SERVICES WITH JBOSS
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Figure 5-7. EJB3 high-level features You might be wondering where all the different methods that were needed in the implementation of a version 2.X EJB have gone in version 3. Methods such as the callbacks provided for bean life cycle management. In EJB3 most of these methods are replaced with annotations applied to any method in the bean class in order to treat it as a life cycle callback method. In EJB3 the container automatically calls the annotated methods. The available annotations in EJB3 are described in Table 5-1.
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Table 5-1. EJB3 Lifecycle Callback Annotations
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Annotation
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@PostConstruct @PreDestroy @PrePassivate @PostActivate @Init @Remove
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Description
Called right after instantiation Called before removal from the bean pool Called before passivation Called right after activation when the instance is ready Called right after instantiation but before PostConstruct
Applicable Bean Type
Stateful/Stateless Session Beans Stateful/Stateless Session Beans Stateful/Stateless Session Beans Stateful Session Beans Stateful Session Beans
Used on a particular method to indicate Stateful Session Beans that the method should be invoked before the bean instance is removed
CHAPTER 5 BUSINESS SERVICES WITH JBOSS
A good practice is to separate your life cycle methods in a separate class. To do this you ll need to annotate the bean class with the @CallbackListener tag that specifies the class to be used as a listener to the life cycle calls.
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