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Listing 5-7. An XML File for Associating a Pointcut with an Aspect Class 1 < xml version="1.0" encoding="UTF-8" > 2 <aop> 3 <aspect class="aop.jboss.MyJBossAOPAspect" /> 4 <bind pointcut="execution(void *->addItem(..))"> 5 <advice name="methInterceptor" 6 aspect="aop.jboss.MyJBossAOPAspect" /> 7 </bind> 8 </aop> The XML file declares that the aop.jboss.MyJBossAOPAspect class is an advice class (see line 2 in Listing 5-7), and it binds this class to the pointcut that includes all the executions of the addItem method.

Figure 11.2 The default class loaders used by Sun s JVM. The bootstrap class loader (sometimes called the boot class loader) is at the top of the hierarchy and loads all platform classes.

<echo>----[ Compiling EJB Source Files ]----------</echo> <javac srcdir="${EJB_SOURCE}" destdir="${EJB_BUILD}" > <classpath> <pathelement location="${EJB_JAR}"/> <pathelement location="${INCLUDE_JARS}"/> </classpath> </javac> </target> <!-================================================== Create the EJB JAR File ================================================== --> <target name="jar_ejb" depends="compile_ejb"> <tstamp/> <echo>---[ Copying META-INF Files ]--------------</echo> <copy todir="${EJB_BUILD}/META-INF"> <fileset dir="${META_SOURCE}"> <include name="*.xml"/> </fileset> </copy> <echo>---------[ Creating EJB JAR File ]--------------</echo> <jar jarfile="${BUILD}/${PROJECT_NAME}.jar" basedir="${EJB_BUILD}" /> </target> <!-================================================================= Run EJBC for Weblogic Container Deployment Descriptors ================================================================= --> <target name="ejbc" depends="jar_ejb"> <tstamp/> <echo>---------[ Creating Deployable Jar File using EJBC ]--</echo> <copy tofile="${BUILD}/wl_${PROJECT_NAME}.jar" file="${BUILD}/${PROJECT_NAME}.jar" /> <java classpath="${CLASSPATH}" classname="weblogic.ejbc" fork="yes"> <sysproperty key="weblogic.home" value="${WL_HOME}"/> <arg line="-compiler javac ${BUILD}/wl_${PROJECT_NAME}.jar ${BUILD}/${PROJECT_NAME}.jar"/> <classpath> <pathelement path= "${WL_HOME}/lib/weblogic_sp.jar;${WL_HOME}/lib/weblogic.jar"/> </classpath> Describes the task </java> that will generate <delete file="${BUILD}/wl_${PROJECT_NAME}.jar"/> the EJB stubs </target> </project>

The system class loader actually loads application classes as specified by an application, and is also known as the application class loader. You can use several mechanisms to specify the location from which the system class loader loads classes. One way is to specify the CLASSPATH environment variable. Another is to specify the manifest Class-Path entry of a JAR file that is being executed or that is in the CLASSPATH. For example, the JAR file actionBazaar-client.jar has a Manifest.mf file in the META-INF directory that has this entry:

When the class loader loads the classes, it will search not only for the required class in the actionBazaar-client.jar, but also in the actionBazaar-utility.jar. The location of the JAR specified in the manifest Class-Path is relative to the JAR file that contains it. For a simple Java application, this process is probably as simple as packaging the classes in a JAR and making the file available in the CLASSPATH. However, in a sophisticated environment such as Java EE, the application servers utilize several mechanisms to load the classes from a variety of locations, such as an application module, a library module, or a shared library configured in the application server environment. When you start up an application server, a Java process starts loading classes required for the application server. When you deploy and execute an application in a Java application server, the application server loads the classes dynamically by creating new instances of class loaders.

The new addition to the build.xml is the ejbc target. This target sets up and executes a Java command that runs the EJB stub compiler for the Weblogic container. In the build properties file, we added the weblogic.jar file to a variable so that we can add it to the classpath for this execution. Examining the new target, notice that it does three things:

You must be curious as to why JVM always loads the class from the parent class loader. In this section we will uncover the reason. Let s review the scenario for ActionBazaar in order to understand the classloading delegation model. The ActionBazaar website is built with JSP pages that invoke EJBs. When a user visits the ActionBazaar website and browses the items listed for auction, the application server uses class loaders to dynamically load required classes from application modules. All class loaders follow a standard algorithm to load classes, as illustrated in figure 11.3. A class loader loads a class dynamically on an as-needed basis. It first looks at its local cache to see if it was loaded earlier. If not, it asks its parent to load the class. If its parent cannot load the class, it attempts to load it from its local code sources. Simply put, a code source is a base location, such as a JAR file,

With the mix-in mechanism provided by JBoss AOP, you can extend the behavior of an application. This mechanism is similar to the mechanism known as intertype declaration in AspectJ. With the mix-in mechanism, you can introduce interfaces, fields, and methods to the existing classes of an application.