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The addBid method throws CreateException and FinderException because the bean class uses CMP 2 entity beans and throws NamingException because it uses JNDI. After migration to EJB 3, the remote interface will look like this:

@Remote public interface PlaceBid { public Long addBid(String userId, Long itemId, Double bidPrice); }

Many developers are still looking to move previously developed CMP and beanmanaged persistence (BMP) entity beans to the EJB 2.0 CMP model, which offers numerous advantages and functionality. For example, CMP beans allow you to use container-managed relationships (CMR) and perform optimizations such as entity caching and lazy loading. When you re creating entity beans, CMP beans should be your first choice.

We obtain the same result as with the JBoss AOP implementation: the Stats class has been transformed into a singleton.

Ah, that s better, isn t it This code assumes that we have migrated the EJB 2 CMP entity beans to use the EJB 3 JPA and are no longer required to throw FinderException and CreateException. In addition, we ve defined the interface as a remote business interface with the annotation @Remote. Unless you need the home interface (also known as adapted home) for backward compatibility with EJB 2 clients, you probably won t need it, so seriously consider removing it. We ll explain how to use the home interface with the EJB 3 session bean, if for some reason you re unable to migrate a client application that is dependent on your EJB. If you decide to use a deployment descriptor, then you must remove the home or local-home element and not have a home interface; otherwise, your EJB module will fail to deploy. The container should generate deployment errors if you forget to do this, and will identify the line number in the deployment descriptor. The bean class Migration of a session bean class is just as straightforward as component interfaces. Here are some changes you ll need to make:

Your bean class doesn t have to implement the javax.ejb.SessionBean interface. Just make the bean a POJO and have it implement the business interface. You don t have to implement unnecessary lifecycle methods. Furthermore, can use any method name you want for your lifecycle methods, and you can use annotations to mark which methods are lifecycle methods. Table 14.2 provides a list of EJB 2 methods with bean types and corresponding annotations that you can use in EJB 3.

To set up a CMP bean, first write the source code of the entity bean. Listing 3.3 contains an example of the EquityBean source code.

Table 14.2 EJB 2 required implementation of several lifecycle methods. If you implemented any of your application s business logic in any of these methods, then you can use the corresponding methods in EJB 3 to migrate that business logic. Bean Type Stateless, Stateful Stateless, Stateful Stateful Stateful Stateless, Stateful Stateful EJB 2 Methods ejbCreate ejbPostCreate ejbPassivate ejbActivate ejbRemove remove method in home interface create method in home interface ejbTimeout Constructor Method annotated with @PostConstruct Method annotated with @PrePassivate Method annotated with @PostActivate Method annotated with @PreDestroy Method annotated with @Remove EJB 3 Methods

Figure 14.3 summarizes these migration steps. The business methods remain unchanged unless you re using other resources or EJBs. The code becomes simplified because you can use injection. This gives you the ability to remove the JNDI code. If you are migrating EJB 2 CMP entity beans and you have a session bean that uses the CMP entity beans, you have to

Unfortunately, this implementation of the Singleton design pattern has limited capability and can cause execution errors. The first problem is the multiple constructor issue. In the example, only one instance reference is stored so that we always return the same instance of the class, regardless of the constructor. Another problem is that this implementation is intrusive and can have damaging side effects on the way the application behaves, as will be described later.

java.util.*; java.rmi.RemoteException; javax.ejb.*; javax.naming.InitialContext;

Figure 14.3 The changes necessary to migrate EJB 2.x bean classes to EJB 3. You don t have to implement EJB specific interfaces in EJB 3, and you don t have to implement all required lifecycle methods, as in EJB 2.