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The term introspection refers to examining the inner cause of a given phenomenon and gaining information about it. In the context of JBoss AOP, you want to retrieve information about the part of the program that lets the joinpoint occur. The Invocation interface is the root type for the introspection mechanism. This interface is implemented by the InvocationBase class. Each type of a joinpoint is represented by a subclass of InvocationBase. Figure 5-1 illustrates this hierarchy. For clarity, only the main methods are given. You should refer to the Javadoc documentation provided with JBoss AOP for a list of all the methods that are defined in this hierarchy.

To create these files, you can use the jar utility that comes with JDK. The final step is to assemble all the JAR files into one EAR file for deployment. In 11.3.1 we show you a build script that creates a JAR file. Each of these JAR types contains an optional deployment descriptor that describes the archive. As we have been discussing throughout this book, you can use metadata annotations instead of a deployment descriptor. In this chapter, we focus primarily on the EAR file and the EJB -JAR file, which contains the session and message-driven beans, as well as entities. It s worth mentioning that entities can be packaged in most archive types. For example, the ability to package entities in WARs allows you to use the EJB 3 JPA in

simple web applications or with lightweight frameworks such as Spring. Note that entities are not supported in RAR modules. This statement, however, begs the question of why Java EE does not have a different archive type to package EJB 3 entities, just as JBoss has the Hibernate Archive (HAR) to package persistence objects with Hibernate s O/R framework. You may know the answer to this question if you have followed the evolution of the EJB 3 specification. For those who haven t, we now regale you with Tales from the Expert Group (cue spooky music) During the evolution of the EJB 3 Public Draft, the PAR (Persistence Archive) was introduced, which mysteriously vanished in the Proposed Final Draft. A huge, emotional battle was fought in the EJB and Java EE expert groups over whether to introduce a module type for a persistence module at the Java EE level, and suggestions were sought from the community at large, as well as from various developer forums. Many developers think a separate persistence module is a bad idea because entities are supported both outside and inside the container. Considering that persistence is inherently a part of any enterprise application, it makes sense to support packaging entities with most module types, instead of introducing a new module type specialized for packaging entities. Now that you know what modules are supported and a little about how they were arrived at, shall we take a quick peek under the hood of an EAR module

For this recipe, we will generate stub classes for deploying EJBs into the Weblogic EJB container. The properties file in listing 9.4 shows the changes needed for this step in our build system. The changes from the previous recipe are shown in bold.

To understand how deployment works, let s take a closer look at the EAR file, the top-level archive file that contains other Java EE archives when it is deployed to the application server. For instance, the ActionBazaar application contains an EJB module, a web module, a JAR containing helper classes, and an application client module. The file structure of the EAR file that ActionBazaar uses looks like this:

Figure 5-1. The org.jboss.aop.Invocation hierarchy for joinpoint instrospection with JBoss AOP The InvocationBase class provides some common methods that are shared by all the joinpoint types. The getTargetObject and getInterceptors methods return the object where the current joinpoint occurred and the array of interceptors associated to the current joinpoint, respectively. The invokeNext method executes the joinpoint. Each class that implements Invocation corresponds to a type of a joinpoint: The CallerInvocation class reifies method and constructor calls. Four direct subclasses are defined (only the first one is represented on the figure): MethodCalledByMethodInvocation, MethodCalledByConstructorInvocation, ConstructorCalledByMethodInvocation, and ConstructorCalledByConstructorInvocation. These classes represent method and constructor calls that come from either a method or a constructor.

META-INF/application.xml actionBazaar-ejb.jar actionBazaar.war actionBazaar-client.jar lib/actionBazaar-commons.jar

#choose classic, modern, jikes, or jvc JAVAC=modern PROJECT_NAME=ejbCookbook #-------------[ Point to the J2EE JAR for includes ]------------------EJB_JAR=C:/j2sdkee1.4/lib/j2ee.jar Used to add the weblogic.jar INCLUDE_JARS=C:/bea/wlserver6.1/lib/weblogic.jar

application.xml is the deployment descriptor that describes the standard Java EE modules packaged in each EAR file. The contents of application.xml look