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The database administrator is not one of the defined Java EE roles. The database administrator may not even understand a line of Java code. However, the importance of this role cannot be overlooked, especially in large corporations where relational databases are outside the control of the application developers. Developers, Assemblers, and Deployers may need to work with the DBAs in order to successfully build and release Java EE applications. It s all about the division of labor. Many believe that the difficulties of earlier EJB practices were a result of the division of the EJB roles. In reality, the previous EJB specifications were not the real culprit the source of all the confusion is the Java EE specification. While the Java EE and EJB specifications define seven roles, the problem is that many project teams do not even have seven people how can a two- or three-person team wear that many hats

file is a file in zip format that contains classes. However, enterprise Java applications are packaged as specialized versions of JAR files EAR, WAR, and EJB -JAR modules before they can be deployed to a Java EE compliant application server. In this chapter we begin with a discussion of application packaging and deployment. The chapter also provides critical information on class loading, so that you can appreciate why the archives are packaged as they are. This is intended to provide you a better understanding of the packaging requirements for EJBs that include entities. We explain the need for deployment descriptors, and look at how to use them. Finally, we look at a persistence unit and how to perform object-relational (O/R) mapping using XML.

================================================= Compile the EJB Source Files ================================================= --> <target name="compile_ejb" depends="init"> <tstamp/> <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}"> Describes the task that will create the <include name="*.xml"/> ejb.jar file </fileset> </copy> <echo>---------[ Creating EJB JAR File ]-------</echo> <jar jarfile="${BUILD}/${PROJECT_NAME}.jar" basedir="${EJB_BUILD}" /> </target> </project>

A typical enterprise Java application may contain several Java classes of different types, such as EJBs, servlets, JavaServer Faces (JSF) managed beans, and entity classes, as well as static files such as JSPs and HTML files As we discussed in chapter 1, EJBs run in the EJB container whereas web applications such as servlets and JSF managed beans run in the web container To run your application you have to make it available to the Java EE application server This is known as deployment Since EJB is a core part of the Java EE specification, you have to follow the Java EE standard for deployment To understand EJB packaging, you must consider how it fits into the bigger picture of Java EE packaging and know what constitutes a complete enterprise Java application.

The issue of code scattering is not linked to a particular language and has been shown to be a problem in numerous applications, whether OOP or another paradigm has been used. In fact, code scattering can appear in any environment from Java with J2SE or J2EE, to C# with .NET, to additional languages. However, the most extensive study of this phenomenon has been carried out using Java. For example, the AspectJ team analyzed the Tomcat servlet container. They realized that if some functionalities, such as URL pattern matching and XML parsing, were cleanly modularized in one or two classes each, others, such as the logging functionality and the management of user sessions, were highly scattered throughout the application.

Up to this point we have focused on using EJB components such as session beans and MDBs to build business logic and JPA entities to implement your persistence code However, your application will not be complete without a presentation tier that accesses the business logic you built with EJBs For example, the EJBs we built for ActionBazaar do not make sense unless we have a client application accessing them Most likely, you ve used standard technologies such as JSP or JSF to build the web tier of your applications These web applications, together with EJBs, constitute an enterprise application that you can deploy to an application server To deploy and run an application, you have to package the complete application together the web module and EJBs and deploy to an application server Usually you will group similar pieces of the application together in modules.