The Business Logic Tier in Java

Printer Quick Response Code in Java The Business Logic Tier
CHAPTER 8 The Business Logic Tier
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<tr class="<%= (i%2 == 0 "even-row" :"odd-row") %>"> <td><%=dateFormatformat(gamegetDateAndTime() getTime())%></td> <td><%=gamegetLocation()getName()%></td> <td><%=gamegetHome()getName()%></td> <td><%=gamegetVisitor()getName()%></td> <td><%=gamegetScore()getHome()%><%=gamegetScore()getVisitor()%></td> </tr> <% } %> </tbody> </table> <% } %> </body> </html>
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XDoclet EJB Utility Class XDoclet generates a utility class that encapsulates some of the standard tasks for accessing the EJB home object from the JNDI tree, creating a remote stub for the EJB, and so forth In Example 810, you replaced all that work with a simple call to the utility object
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LeagueFacadeUtilgetHome()create();
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Running the Application
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At this point, you have created all the code for the application and are ready to run it Running the application involves deploying it to the application server Do the following: 1 Select schedulejsp, right click, and invoke the Run As Run on Server menu item The Run On Server wizard opens (see Figure 836) 2 You must now add your modules to a new server configuration You already have JBoss added to your workspace, so select it as the server runtime You can also set this server as the default server associated with the project Click Next to continue Accept the defaults, and click Next again The Add and Remove Projects page is displayed (see Figure 837)
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Iteration 2: Developing Session EJBs
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Figure 836 Define a New Server
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3 Select the EAR project to include in the server Since the enterprise application already includes all the modules, you do not have to add them individually You only have one EAR project available, LeaguePlanetEAR, and it contains the EJB, Web, and utility modules you want to run Click the Finish button The wizard creates the server, starts it, publishes the projects to it, and launches the Web browser using the proper URL for schedulejsp (see Figure 838)
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CHAPTER 8 The Business Logic Tier
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Figure 837 Add and Remove Projects
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Figure 838 Run on Server schedulejsp
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Iteration 2: Developing Session EJBs
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Server Delays Sometimes the Web browser will request the URL before the deployment process is complete This is because as soon as the server starts, the browser will get a chance to send the request However, it takes a few seconds for the server to complete the deployment process If you experience problems testing the EJB, check the server console for messages (see Example 811) The console will indicate when the deployment process is complete After the EJBs are deployed, you can refresh your browser You should get the proper response
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Example 811 JBoss Console Output
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INFO INFO INFO INFO INFO INFO [EARDeployer] Init J2EE application: LeagePlanetEARear [EjbModule] Deploying LeagueFacade [BaseLocalProxyFactory]Bound EJB LocalHome 'LeagueFacade' to jndi [ProxyFactory]Bound EJB Home 'LeagueFacade'to jndi 'LeagueFacade' [EJBDeployer]Deployed: LeagePlanetEARear/LeagePlanetEJBjar [EARDeployer]Started J2EE application: LeagePlanetEARear
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4 When you modify any of the modules, you will need to publish them again before you can test your changes In addition to publishing, the Servers view lets you start, stop, and restart servers (see Figure 839)
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Figure 839 Servers View
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CHAPTER 8 The Business Logic Tier
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Developing EJB 30 with WTP
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WTP 15 does not have many tools for EJB 30 These will be available with WTP 20 You can try using an early WTP 20 build that provides EJB 30 projects if you are really keen (see the WTP Build Types section in 4) In fact, you ll be making a valuable contribution to WTP 20 by evaluating the planned EBJ 30 support and providing feedback However, there is no need to wait for WTP 20 If you are willing to get your hands a little dirty, you can still build EJB 30 application using WTP 15 In this section we give you some hints as to how you can use WTP 15 for EJB 30 development In EJB 30, you still need to build a bean, you still need a container, and clients still call EJBs, but the programming model becomes a lot simpler EJB 30 beans are still packaged in EJB-JAR files, so you can use a basic J2EE utility project to package them Deployment descriptors are optional for EJB 30, so you can skip creating them for now You can take any POJO and make it an EJB 30 bean You can use the same business class and the same business interface For example, you do not have to change the classes in your model to make them EJB 30 beans or create component and home interface types like you have already done You make your POJOs EJB 30 beans by adding JSR 175 annotations However, these annotations are only available if you use Java 5 and above To create an EJB 30 bean for League Planet, do the following: 1 Use a JDK that is 15 (that is, Java 5) or above as the Java runtime environment for your projects and servers 2 Use a server runtime environment that supports EJB 30 For example, Sun Microsystems provides GlassFish that can run EJB 30 GlassFish also provides a WTP server adapter plug-in You can download this plug-in from
https://glassfishpluginsdevjavanet/
3 Use a J2EE utility project (for example, the LeaguePlanetModel project you used in this chapter) and target it to a server that supports EJB 30 4 Add EJB 30 JARs that are provided with the server to the build path of the project so you can use EJB 30 annotations 5 Add annotations to your classes and interfaces so that they are marked as EJB 30 beans For example, you can easily use the classes in your comleagueplanetservices package by adding EJB 30 annotations (see Example 812)