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public Connection getConnection() { DataSource ds = null; try { Creates and uses the InitialContext ctx = new InitialContext(); JNDI initial context ds = ( javax.sql.DataSource ) ctx.lookup( "java:comp/env/ejbBookDataSource" ); return ds.getConnection(); } catch(Exception e) { e.printStackTrace(); } return null; } }

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.

These instances are the same!

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

This recipe shows the best way to acquire the connection. Data sources allow you to use connection pooling and optimize database access. To use a data source from the application server, you must perform two steps:

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:

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.

We have successfully applied the Singleton design pattern to the class Stats without needing to modify the code of Stats, or any class that uses it.

Set up the EJB s deployment descriptor so that the implementation can find a JDBC data source. From inside the EJB, look up the DataSource via a JNDI name and acquire a JDBC connection.

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.

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.

For the first step, you need to add a <resource-ref> tag to declare a DataSource resource for the EJB (and map it to a particular JNDI name). Resources available to an EJB include JDBC DataSource, JavaMail, and the Java Message Service (JMS). In this case, the name ejbBookDataSource is mapped to a JDBC DataSource instance provided by the EJB container. The JNDI name and DataSource mapping are configured by the application server in a vendor-specific manner. For more details about your application server, refer to your vendor s documentation. The final step in creating the JDBC connection requires the EJB to look up the declared resource. To look up an object using JNDI, you first need to obtain the InitialContext provided to your bean from the EJB container. To do this, you simply have to construct a new InitialContext object with its default constructor. Once you have the context, you need only call its lookup() method, passing in the