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Migrating session beans
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Next, you would look up an instance of a container-managed EntityManager via JNDI as follows:
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Context context = new InitialContext(); EntityManager entityManager = (EntityManager) context.lookup("java:comp/env/ActionBazaarEntityManager"); ... entityManager.persist(bid);
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Notice that this JNDI lookup appears to be like all the others in the book. The only special thing you would have to do is to package a persistence.xml that describes the persistence unit and set version="3.0" in the ejb-jar.xml. It s starting to look familiar, isn t it Using EJB 3 from EJB 2 boils down to
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Making some modifications to your deployment descriptors Working a little JNDI magic to get object references (if your server doesn t support dependency injection for EJB 2)
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That s all there is to it! It s so simple that this concludes our discussion on backward compatibility and interoperability of EJB applications.
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The EJB specification requires that an EJB container be interoperable with CORBA applications using RMI-IIOP. While this is possible, we don t think this is commonly used so we won t discuss it in this chapter. If your application requires interoperability with CORBA, we suggest you explore this on your own by referring to the EJB 3 Core Contracts specification.
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The new way to achieve interoperability with heterogeneous systems is web services. In chapter 15 we discuss exposing EJB 3 stateless session beans as web services and invoking web services from EJB 3 applications. But that s a whole chapter away, and we re not through talking about migration yet. Let s see; we ve talked a bit about swapping bean invocations between EJB 2 and EJB 3 what do you say we explore how to migrate session beans next
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14.2 Migrating session beans
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If you re using EJB 2 session beans (which will be supported for a while by many major vendors), why you would migrate to EJB 3 Here area few reasons that come to mind:
Migrating to EJB 3
You may be releasing a new version of your application and you want to take advantage of new EJB 3 features such as interceptors and dependency injection. Migrating beans to use EJB 3 will simplify your code and improve maintainability of your application. Because EJB 3 is POJO based, you can also simplify your unit tests. Migrating your applications will renew your applications for a few more years.
Migrating session beans to EJB 3 is quite easy because it is as simple as
Pruning the existing EJB code to make it a POJO Defining at least one business interface Using annotations instead of a deployment descriptor Replacing redundant JNDI code with dependency injection
The remainder of this section further breaks down the details involved in migrating session beans from EJB 2 to EJB 3.
14.2.1 Converting interface and bean classes
An EJB 2 session bean has at least one component interface (local or remote), one home interface, and one bean class. The component and home interfaces extend the EJB -specific interfaces, while the bean class implements the javax. ejb.SessionBean interface. After you migrate your bean to EJB 3, it is a POJO and the bean class implements its business interfaces. Table 14.1 summarizes the changes between EJB 2.1 and EJB 3.
Table 14.1 EJB 2 required many interfaces that needed to extend EJB-specific interfaces. EJB 3 makes the home interface optional. Components of a Session Bean Remote or local component interface Home interface EJB 2 Extends either EJBObject or EJBLocalObject Extends EJBHome or EJBLocalHome EJB 3 Business interface (POJI).
Optional for maintaining EJB 2 client view. Candidate for removal. Implements business interface.
Bean class
Implements javax.ejb. SessionBean
Migrating session beans
Given that the home interface is optional, you can consider it deprecated. We recommend you begin the process of making the shift away from the home interface in both your thinking as well as your code. More on removing the home interface in the sections ahead... Interfaces If you need to migrate your component interfaces, we ve got just the recipe; you ll have to make the following changes:
Your component interface (remote or local) becomes a regular business interface. In other words, it does not extend one of the EJB interfaces. Your business methods don t have to throw unnecessary exceptions such as RemoteException.
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