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You may not need the power or additional complexity of EJBs for every Java EE application, and therefore decide to forego session beans on occasion. For instance, you may choose to stick with POJOs and servlets to implement business logic, and include the entities directly in the web module (or WAR). In this section, we ll show you how to use entities directly from the web tier. In chapter 11, we explained that entities can be packaged in the web module, but we skipped over the details of how to do it. You can make your entity classes available to your web module in one of two ways:

Place entity classes directly in WEB-INF/classes. When you package classes in the WEB-INF/classes directory of a WAR module, the persistence.xml and optional orm.xml are placed in the WEB-INF/classes/META-INF/ directory. Alternatively, you can package entity classes in a JAR file and place the file in the WEB-INF/lib directory. That way, you can package the persistence. xml and optional orm.xml descriptors in the META-INF directory of the JAR.

The advice in Listing 6-23 is invoked if a ServletException is thrown. Unlike the preceding advice, it declares four arguments, so that it has access to the invoked method, method arguments, and target object: Listing 6-23. A Throws Advice Example, with Arguments public static class ServletThrowsAdviceWithArguments implements ThrowsAdvice { public void afterThrowing(Method m, Object[] args, Object target, ServletException ex) { // Do something with all arguments } } The final example, shown in Listing 6-24, illustrates how these two methods could be used in a single class, which handles both RemoteException and ServletException. Any number of throws advice methods can be combined in a single class. Listing 6-24. A Combined Throws Advice Example public static class CombinedThrowsAdvice implements ThrowsAdvice { public void afterThrowing(RemoteException ex) throws Throwable { // Do something with remote exception } public void afterThrowing(Method m, Object[] args, Object target, ServletException ex) { // Do something will all arguments } }

/** * @ejb.bean type="Stateful" * view-type="both" * jndi-name="${user.bean.jndi}" * * @ejb.security-role-ref * role-name="ADMIN" * role-link="administrator" * */ public class UserBean implements SessionBean{

This means the structure of your WAR module will look something like this:

html/ jsp/ WEB-INF/web.xml WEB-INF/classes actionbazaar/persistence/Bid.class ... acionbazaar/web/ActionBazaarActionController.class META-INF/persistence.xml Required META-INF/orm.xml Optional WEB-INF/lib/entities.jar

You must also be sure that your <ejbdoclet/> task in the build.xml file includes the correct subtask to generate the deployment XML file (see recipe 2.3).

If you don t package entities in the WEB-INF/classes, then you don t have to package persistence.xml and the optional orm.xml in the WAR file. The entities.jar packaged in our example contains entities.

After returning advice in Spring implements the org.springframework.aop. AfterReturningAdvice interface, shown in Listing 6-25. Listing 6-25. The AfterReturningAdvice Interface public interface AfterReturningAdvice extends Advice { void afterReturning(Object returnValue, Method m, Object[] args, Object target) throws Throwable; } After returning advice can access the return value but cannot modify it. Like before advice, it can access the invoked method, the methods arguments, and the target. As an example, the after returning advice in Listing 6-26 counts all successful method invocations that have not thrown exceptions:

As you can see, packaging the entities with the web module is easy, but you may be wondering how to use them. There are three common scenarios for using EJB 3 JPA from the web container:

Using a container-managed entity manager in a Java EE 5 container Using an application-managed entity manager with a JTA transaction manager in a Java EE 5 container Using an application-managed entity manager with local transactions outside the container

As you can see, there is nothing too complicated about specifying security roles. In addition, you can use the @ejb.security-identity tag to declare the bean to assume a role when it acts as a client to another bean. This tag has the attributes user-caller-identity and run-as, which correspond to the XML elements you should recognize.

The first two cases will be more prevalent because of the power of container-managed entity managers and JTA transactions, but for completeness we ll discuss all three scenarios in this section.