Iteration 2: Developing Session EJBs in Java

Encoder QR-Code in Java Iteration 2: Developing Session EJBs
Iteration 2: Developing Session EJBs
QR Code ISO/IEC18004 Generator In Java
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<<interface>> javaxejbSessionBean
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<<interface>> javaxejbEJBObject
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<<interface>> javaxejbEJBHome
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<<implements>>
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<<implements>>
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<<implements>>
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comleagueplanetservices IceHockeyFacade
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comleagueplanetejb <<Call>> <<interface>> LeagueFacade <<interface>> LeagueFacadeHome
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LeagueFacadeImpl
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<<implements>>
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<<implements>> <<interface>> LeagueFacade
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LeagueFacadeBean
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LeagueFacadeSession
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<<creates>>
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Assembled into
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LeaguePlanetEJB jar
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Figure 814 The Class Diagram for the EJB Component
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4 Assemble the EJBs in an EJB-JAR file and deploy it to a server You may need to define additional configuration information, such as JDBC connection pools or JMS destinations, to run EJBs
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Adding JBoss
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Before you start building EJBs, you will need to add a server runtime environment that supports EJBs This iteration contains instructions for using JBoss However, if you have another J2EE application server that supports EJBs Apache Geronimo, for example feel free to use it instead Also, XDoclet will speed your coding but you will need to configure it before you can use it
CHAPTER 8 The Business Logic Tier
Just as you use a JRE to run Java applications, WTP uses installed server runtime environments to run EJBs The JBoss application server is one of the many available runtime environments that support EJBs To use JBoss with WTP you must: 1 Obtain and install the JBoss server runtime environment 2 Add the server runtime environment to your workspace 3 Create a server configuration, and add EJB projects to it WTP does not include any runtimes You must obtain the JBoss server runtime from
http://wwwjbossorg
and install it on your machine To add the JBoss server runtime environment to your workspace, you will use the Generic Server Adapter for JBoss, which is provided with WTP This adapter can start and stop the server and publish your projects to it You can easily replace JBoss with any other server runtime environment that has support for EJBs, such as ObjectWeb JOnAS, Apache Geronimo, IBM WebSphere, BEA WebLogic, Oracle AS, and others After you install the server, you configure the adapter with the installation location and other parameters, such as passwords Do the following to add JBoss to your workspace: 1 Open the Preferences dialog and select the Server page Select the Installed Runtimes preferences page Click the Add button The New Server Runtime wizard opens (see Figure 815) 2 The New Server Runtime dialog lists all of the server adapters that are currently installed Select JBoss v40 from the JBoss category and click the Next button The JBoss Server wizard opens (see Figure 816) 3 JBoss must be installed on your machine at this point in order to proceed You will use JBoss v405 GA in this example The JBoss Server wizard needs the location of the JBoss installation directory Enter the location or select it using the Browse button You also need to specify a JRE A full JDK is needed, because it has the required Java compiler Click the Finish button The Installed Runtimes preference page now lists JBoss (see Figure 817) Click the checkbox to make JBoss the default server runtime environment JBoss is now added to your workspace Next you will add XDoclet to your workspace
Figure 815 New Server Runtime
Figure 816 JBoss Server
CHAPTER 8 The Business Logic Tier
Figure 817 Installed Runtimes JBoss
XDoclet
You can program EJBs manually using Eclipse Java tools, or you can use tools like XDoclet to help you generate some of the code XDoclet is a development tool; it is not needed to run EJBs XDoclet is an Open Source framework for generating EJBs, servlets, and other kinds of Java code It uses its own annotations (not the standard JSR 175 annotations) to define properties and attributes of EJBs in the Javadoc comments of Java source code Annotations are special Javadoc tags XDoclet will likely become obsolete with EJB 30 as we will all switch to using JSR 175 annotations When you code an EJB class with XDoclet annotations, the XDoclet engine parses the source files and generates code for EJB deployment descriptors; home, local, and remote interfaces; and EJB methods The generated code is standard J2EE code WTP has project facets that enable the XDoclet engine for EJB projects You can add the XDoclet facet for EJBs, EJBDoclet, to EJB projects WebDoclet is a similar facet for dynamic Web projects Adding the XDoclet facet installs a builder that automatically generates EJB code from the annotated source code