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Moreover, application servers allow you to explicitly specify a global JNDI name using the mappedName parameter of the @Resource annotation. For example, if you re using the JBoss Application Server and you have a data source with a global JNDI name of java:/DefaultDS, you can specify the resource mapping as follows:

@Resource(name="jdbc/ActionBazaarDS", mappedName="java:/DefaultDS") private javax.jdbc.DataSource myDB;

<% UserTransaction transaction = ( UserTransaction ) Session.getAttribute("CURRENT_TRANSACTION" ); //do some work with EJBs %>

In this case, the container will look up the data source with the global JNDI name of java:/DefaultDS when the ENC java:comp/env/jdbc/ActionBazaarDS is resolved. However, remember that using the mappedName parameter makes code less portable. Therefore, we recommend you use deployment descriptors for mapping global JNDI names instead. Note that, similar to the @Resource annotation, the @EJB annotation has a mappedName parameter as well.

all pointcut type, 98 joinpoint introspection, 101 102 method-call pointcuts, 98 wildcards in pointcut expressions, 97 JOTM (Java Open Transaction Monitor), 83 JoyAop, AOP Alliance framework, 64 JTA (Java Transaction API) manual control of transactions with JTA, 262 264

Behind the scenes, the container resolves the JNDI references to the resources and binds the resource to the ENC during deployment. If the resource is not found during injection, the container throws a runtime exception and the bean becomes unusable. Beyond JNDI name mapping, the @Resource annotation is meant to be a lot more flexible when it needs to be than what is apparent in our deliberately straightforward data source injection example. To illustrate some of these robust features, let s take a look at the definition for the annotation:

While this recipe will work, using it might indicate a possible need to re-architect your method of presenting a process to the end user. A better way of solving this problem, rather than carrying a transaction across multiple pages using the Session, is to store the user s progress in a stateful session bean. The sequence should move something like this:

@Target({TYPE, METHOD, FIELD}) @Retention(RUNTIME) public @interface Resource { public enum AuthenticationType { CONTAINER, APPLICATION } String name() default ""; Class type() default Object.class; AuthenticationType authenticationType() default AuthenticationType.CONTAINER; boolean shareable() default true; String mappedName() default ""; description() default ""; }

The first point you should note from the definition of the @Resource annotation is that it is not limited to being applied to instance variables. As the @Target value indicates, it can be applied to setter methods, and even classes. Setter vs. field injection Other than field injection, setter injection is the most commonly used option for injection. To see how it works, let s transform our data source example to use setter injection:

Kiczales, Gregor, 1 2, 6, 150 AOP description, 9 AspectJ, 23

The user starts the process and the JSP creates a stateful session bean for the user session. For each process step, the JSP collects data and sends it to the user s session bean.

@Stateless public class PlaceBidBean implements PlaceBid { ... private DataSource dataSource; ... @Resource(name="jdbc/actionBazaarDB") public void setDataSource(DataSource dataSource) { this.dataSource = dataSource; }

As you can see, setter injection relies on JavaBeans property-naming conventions. In case you are unfamiliar with them, the conventions dictate that the instance variables of an object should always be private so that they cannot be externally accessible. Instead, an instance variable named XX should have corresponding nonprivate methods named getXX and setXX that allow it to be accessed and set externally. We ve seen how the setter for the PlaceBidBean dataSource variable looks. The getter could look like this:

The process completes. The JSP starts a transaction in the session bean, commits the data, and ends the transaction. The JSP reports the status back to the user.

public DataSource getDataSource() { return dataSource; }