1 Reply Latest reply on May 27, 2010 9:58 PM by Pablo Ochoa

    Persistent Context in Seam

    Pablo Ochoa Newbie

      Hello to everyone, I'm starting with SEAM development so please excuse me is this is an obvious question,  I wanted to run an example from a book using the @PersistenceContext annotation in an EJB. This is the code for my class:




      package org.domain.helloworld.session;
      
      import java.util.List;
      
      import javax.ejb.Remove;
      import javax.persistence.EntityManager;
      import javax.persistence.PersistenceContext;
      
      import org.jboss.seam.annotations.Destroy;
      import org.jboss.seam.annotations.In;
      import org.jboss.seam.annotations.Out;
      import org.jboss.seam.annotations.Name;
      
      import com.sun.xml.internal.ws.developer.Stateful;
      
      @Stateful
      @Name("management")
      public class ManagerAction implements Manager {
      
              @In
              Person person;
              @Out
              List<Person> fans;
              @PersistenceContext
              private EntityManager em;
              
              @SuppressWarnings("unchecked")
              public void sayHello() {
                      em.persist(person);
                      
                      fans=em.createQuery("select p from Person p").getResultList();
                      
                      
              }
              @Remove
              @Destroy
              public void destroy() {
                      // TODO Auto-generated method stub
                      
              }
      }
      




      The problem is that when I deploy this code to JBoss 5.1 I get the following exception:





      19:47:00,943 ERROR [[/HelloWorld]] Excepción enviando evento inicializado de contexto a instancia de escuchador de clase org.jboss.seam.servlet.SeamListener
      java.lang.RuntimeException: Could not create Component: management
              at org.jboss.seam.init.Initialization.addComponent(Initialization.java:1202)
              at org.jboss.seam.init.Initialization.installComponents(Initialization.java:1118)
              at org.jboss.seam.init.Initialization.init(Initialization.java:733)
              at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:36)
              at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3910)
              at org.apache.catalina.core.StandardContext.start(StandardContext.java:4393)
              at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeployInternal(TomcatDeployment.java:310)
              at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy(TomcatDeployment.java:142)
              at org.jboss.web.deployers.AbstractWarDeployment.start(AbstractWarDeployment.java:461)
              at org.jboss.web.deployers.WebModule.startModule(WebModule.java:118)
              at org.jboss.web.deployers.WebModule.start(WebModule.java:97)
              at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
              at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
              at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
              at java.lang.reflect.Method.invoke(Unknown Source)
              at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
              at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
              at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
              at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
              at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
              at org.jboss.system.microcontainer.ServiceProxy.invoke(ServiceProxy.java:206)
              at $Proxy38.start(Unknown Source)
              at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:42)
              at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:37)
              at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62)
              at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71)
              at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51)
              at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348)
              at org.jboss.system.microcontainer.ServiceControllerContext.install(ServiceControllerContext.java:286)
              at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631)
              at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934)
              at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082)
              at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984)
              at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822)
              at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553)
              at org.jboss.system.ServiceController.doChange(ServiceController.java:688)
              at org.jboss.system.ServiceController.start(ServiceController.java:460)
              at org.jboss.system.deployers.ServiceDeployer.start(ServiceDeployer.java:163)
              at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:99)
              at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:46)
              at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.internalDeploy(AbstractSimpleRealDeployer.java:62)
              at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:50)
              at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:171)
              at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(DeployersImpl.java:1439)
              at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1157)
              at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1178)
              at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:1098)
              at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348)
              at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631)
              at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934)
              at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082)
              at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984)
              at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822)
              at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553)
              at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:781)
              at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:702)
              at org.jboss.system.server.profileservice.repository.MainDeployerAdapter.process(MainDeployerAdapter.java:117)
              at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:362)
              at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:255)
              at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
              at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source)
              at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
              at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(Unknown Source)
              at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(Unknown Source)
              at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
              at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
              at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
              at java.lang.Thread.run(Unknown Source)
      Caused by: java.lang.IllegalArgumentException: @PersistenceContext may only be used on session bean or message driven bean components: management
              at org.jboss.seam.Component.checkPersistenceContextForComponentType(Component.java:901)
              at org.jboss.seam.Component.scanField(Component.java:877)
              at org.jboss.seam.Component.initMembers(Component.java:557)
              at org.jboss.seam.Component.<init>(Component.java:244)
              at org.jboss.seam.Component.<init>(Component.java:205)
              at org.jboss.seam.init.Initialization.addComponent(Initialization.java:1186)
              ... 67 more





      So it says the problems is the following line:
      java.lang.IllegalArgumentException: @PersistenceContext may only be used on session bean or message driven bean components:
      Why is this happening?, is there something I should do before using the @PersistenceContext annotation.


      In fact, when I commented all the @PersistenceContext annotations, the application was deployed to the container without a problem.
      Please can you help me solving these issue.
      Thanks a lot.