Figure 840 New EJB Wizard in Java

Painting Quick Response Code in Java Figure 840 New EJB Wizard
Figure 840 New EJB Wizard
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CHAPTER 8 The Business Logic Tier
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2 Select the MessageDrivenBean radio button Click the Next button to proceed to the EnterpriseJavaBean class page (see Figure 841)
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Figure 841 Create EnterpriseJavaBean Class
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3 Ensure the LeaguePlanetEJB project is entered as the project and /LeaguePlanetEJB/ejbModule is selected as the folder Enter comleagueplanetmdb as the Java package and AsyncLeagueFacadeBean as the class name Click the Next button The next page allows you to enter initial attributes of the message-driven bean (see Figure 842) 4 In this page you can review and modify MDB parameters These parameters are reflected as settings in the deployment descriptors Ensure that the destination type is Queue, since in this example you only want one MDB to ever receive a given message Change the destination JNDI name to queue/AsyncLeagueFacade Leave the other settings with their default values Click the Next button The next page allows you to choose interfaces for the EJB (see Figure 843) 5 A message-driven bean must implement the javaxejbMessageDrivenBean and javaxjmsMessageListener interfaces in addition to its business interfaces Proceed with the defaults, and click Finish to generate the MDB The wizard will create a new MDB, and the XDoclet engine will generate the rest of the code
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Iteration 3: Message-Driven Beans
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Figure 842 MDB Properties
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Figure 843 MDB Interfaces
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CHAPTER 8 The Business Logic Tier
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6 Open the AsyncLeagueFacadeBean class, and add an XDoclet annotation for the connection factory JNDI name In JBoss, the name is Connection Factory Also modify the contents of the ejbCreate and onMessage methods to match what you see in Example 813
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Example 813 Listing of AsyncLeagueFacadeBeanjava
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package comleagueplanetmdb; import javaxjmsJMSException; import javaxjmsObjectMessage; import comleagueplanetmodelLeague; import comleagueplanetservicesIceHockeyFacade; import comleagueplanetservicesLeagueFacade; /** * @ejbbean * name="AsyncLeagueFacade" * acknowledge-mode="Auto-acknowledge" * destination-type="javaxjmsQueue" * transaction-type="Container" * destination-jndi-name="queue/AsyncLeagueFacade" * connection-factory-jndi-name="ConnectionFactory" * * @ejbtransaction="Supports" */ public class AsyncLeagueFacadeBean implements javaxejbMessageDrivenBean, javaxjmsMessageListener { private javaxejbMessageDrivenContext messageContext = null; private LeagueFacade leagueFacade; public void setMessageDrivenContext( javaxejbMessageDrivenContext messageContext) throws javaxejbEJBException { thismessageContext = messageContext; } /** * @ejbcreate-method */ public void ejbCreate() { leagueFacade = IceHockeyFacadegetLeagueFacade(); } public void ejbRemove() { messageContext = null; } public void onMessage(javaxjmsMessage message) {
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try { League aNewLeague = (League) ((ObjectMessage) message) getObject(); leagueFacadecreateLeague(aNewLeague); Systemoutprintln( New League: + aNewLeaguegetName()); } catch (JMSException e) { eprintStackTrace(); } } }
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It is this simple Next you add a new message destination to JBoss
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Add a Queue to JBoss
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All that s left is to use some administrative magic to define a new message destination in JBoss named queue/AsyncLeagueFacadeQueue and write a simple Web application that will send messages to your MDB JBoss defines JMS topics and queues using MBeans (Refer to JBoss documentation for detailed information on MBeans) There are two ways to create them: adding your queue to the appropriate XML configuration file or using the JBoss console The configuration file is fairly simple, so you will use that method Locate the file named jbossmq-destinations-servicexml in the JBoss server/default/deploy/jms folder It contains a list of JMS destinations and sets up a list of test topics and queues You can follow the example to add a queue Add a definition like what is shown in Example 814
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Example 814 Configuration of the JBoss MQ Destination
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<mbean code="orgjbossmqserverjmxQueue" name="jbossmqdestination:service=Queue,name=AsyncLeagueFacade"> <depends optional-attribute-name="DestinationManager"> jbossmq:service=DestinationManager </depends> </mbean>
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1 The EJB module is now ready Next you will add a servlet and an HTML form to your Web module Create a new servlet named CreateLeagueAction in the LeaguePlanetWeb project The servlet URL mapping should direct
CHAPTER 8 The Business Logic Tier
all requests to CreateLeagueAction Use the servlet wizard to add this servlet to the Web module The deployment descriptor for the Web module should now have definitions for this servlet (see Example 815)
Example 815 Listing of webxml
< xml version="10" encoding="UTF-8" > <web-app id="WebApp_ID" version="24" xmlns= http://javasuncom/xml/ns/j2ee" xmlns:xsi="http://wwww3org/2001/XMLSchema-instance xsi:schemaLocation="http://javasuncom/xml/ns/j2ee http://javasuncom/xml/ns/j2ee/web-app_2_4xsd"> <display-name>LeaguePlanetWeb</display-name> <servlet> <description></description> <display-name>CreateLeagueAction</display-name> <servlet-name>CreateLeagueAction</servlet-name> <servlet-class> comleagueplanetservletCreateLeagueAction </servlet-class> </servlet> <servlet-mapping> <servlet-name>CreateLeagueAction</servlet-name> <url-pattern>/CreateLeagueAction</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>indexhtml</welcome-file> </welcome-file-list> </web-app>
2 Implement the servlet code Make sure that the code for your servlet looks like what is shown in Example 816
Example 816 Listing of CreateLeagueActionjava
package comleagueplanetservlet; import javaioIOException; import import import import javaxjms*; javaxnamingNamingException; javaxservlet*; javaxservlethttp*;
import comleagueplanetmdbAsyncLeagueFacadeUtil; import comleagueplanetmodelLeague; public class CreateLeagueAction extends HttpServlet implements Servlet { private final static int SESSIONTYPE = SessionAUTO_ACKNOWLEDGE;