@MessageDriven bean 没有收到消息

Question

我根据另一个问题的建议进行了一些更改，将我的班级变成@Singleton 而不是@Stateless，但是我不再像以前那样在@MessageDriven Bean 中接收消息。建议？注意主题在jbossmq-destinations-service.xml中定义正确

@javax.ejb.Singleton(mappedName="MySingletonClass")
public class MySingletonClass implements SomeInterface
{
   private Timer timer = null;

   @javax.annotation.Resource
   TimerService timerService;


   /**
    * Creates the timer.
    */
   @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
   public void resetTimer()
   {
      if (timer != null)
      {
         timer.cancel();
      }
      timer = timerService.createTimer(30000, "Note");
   }

   @Override
   public void readResponseMsg(Document responseXml)
   {
      resetTimer();
      //Do stuff
   }

   @Override
   @Timeout
   public void timeout() throws RemoteException
   {
       //do stuff
   }
}

和 MDB：

@javax.ejb.MessageDriven(mappedName = "jms/MyTopic", activationConfig = {
      @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Topic"),
      @ActivationConfigProperty(propertyName = "destination", propertyValue = "MyTopic"),
      @ActivationConfigProperty(propertyName = "messagingType", propertyValue = "javax.jms.MessageListener"),
      @ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge") })
@ResourceAdapter("activemq.rar")
public class MyMDB implements MessageListener
{
   private static final Logger ourLogger = Logger.getLogger(MyMDB.class);

   @javax.ejb.EJB(mappedName="MySingletonClass") private MySingletonClassInterface reader;

   /**
    * @param message
    */
   public void onMessage(Message message)
   {
      TextMessage textMessage = (TextMessage) message;
      try
      {
         System.out.println("Received Message Text: " + textMessage.getText());
         reader.readResponseMsg(loadXMLFromString(textMessage.getText()));
      }
      catch (JMSException | SAXException | ParserConfigurationException | IOException e)
      {
         ourLogger.error("Exception handling Schedule Results Message", e);
      }
   }
}

这是界面：

@javax.ejb.Local
public interface SomeInterface
{
   public void readResponseMsg(Document responseXml);


   public void timeout() throws RemoteException;
}

更新我一直在摆弄一些事情，现在看到一些异常，至少表明正在发生一些事情。我已经用我的更改更新了上面的代码。这是我的例外：

Caused by: javax.naming.NameNotFoundException: MySingletonClass not bound
    at org.jnp.server.NamingServer.getBinding(NamingServer.java:771) [:5.0.5.Final]
    at org.jnp.server.NamingServer.getBinding(NamingServer.java:779) [:5.0.5.Final]
    at org.jnp.server.NamingServer.getObject(NamingServer.java:785) [:5.0.5.Final]
    at org.jnp.server.NamingServer.lookup(NamingServer.java:396) [:5.0.5.Final]
    at org.jnp.server.NamingServer.lookup(NamingServer.java:399) [:5.0.5.Final]
    at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:728) [:5.0.5.Final]
    at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:688) [:5.0.5.Final]
    at javax.naming.InitialContext.lookup(InitialContext.java:411) [:1.7.0_25]
    at org.jnp.interfaces.NamingContext.resolveLink(NamingContext.java:1350) [:5.0.5.Final]
    ... 61 more

另外，在 JBoss 6 启动日志中，我也看到了这个：

 [BeanInstantiatorDeployerBase] Installed org.jboss.ejb3.instantiator.impl.Ejb31SpecBeanInstantiator@fbda95 into MC at org.jboss.ejb.bean.instantiator/mmpl/server/MySingletonClass

然后再往下看一点：

DEPLOYMENTS MISSING DEPENDENCIES:
  Deployment "jboss-switchboard:appName=mmpl,module=server,name=MyMDB" is missing the following dependencies:
   Dependency "jboss.j2ee:ear=mmpl.ear,jar=server.jar,name=MySingletonClass,service=EJB3" (should be in state "Installed", but is actually in state "** NOT FOUND Depends on 'jboss.j2ee:ear=mmpl.ear,jar=server.jar,name=MySingletonClass,service=EJB3',whenRequired=MapControllerStateModel$ControllerStateWrapper@7ba014{Installed},dependentState=MapControllerStateModel$ControllerStateWrapper@7ba014{Installed} **")
  Deployment "jboss.j2ee:ear=mmpl.ear,jar=server.jar,name=MySingletonClass,service=EJB3_endpoint" is missing the following dependencies:
    Dependency "jboss.j2ee:ear=mmpl.ear,jar=server.jar,name=MySingletonClass,service=EJB3" (should be in state "Installed", but is actually in state "** NOT FOUND Depends on 'jboss.j2ee:ear=mmpl.ear,jar=server.jar,name=MySingletonClass,service=EJB3' **")

DEPLOYMENTS IN ERROR:
  Deployment "jboss.j2ee:ear=mmpl.ear,jar=server.jar,name=MySingletonClass,service=EJB3" is in error due to the following reason(s): ** NOT FOUND Depends on 'jboss.j2ee:ear=mmpl.ear,jar=server.jar,name=MySingletonClass,service=EJB3',whenRequired=MapControllerStateModel$ControllerStateWrapper@7ba014{Installed},dependentState=MapControllerStateModel$ControllerStateWrapper@7ba014{Installed} **, ** NOT FOUND Depends on 'jboss.j2ee:ear=mmpl.ear,jar=server.jar,name=MySingletonClass,service=EJB3' **

Answer 1

我最终放弃了 ejb 单例的想法并使用了以下方法，效果很好：

public class MySingletonClass implements SomeInterface
{
   private ScheduledFuture<?> handle;
   private static ScheduledExecutorService executor;
   private static SomeInterface instance;

   public void readResponseMsg(Document responseXml)
   {
       resetTimer();
       //do stuff
   }

   /**
    * Creates the timer.
    */
   private void resetTimer()
   {
      if (handle != null)
      {
         handle.cancel(false);
      }
      handle = executor.schedule(this, 30l, TimeUnit.SECONDS);
   }


   /**
    * Initialize the static variables. Should only be called once per server
    * restart
    */
   private static void init()
   {
      try
      {
         executor = Executors.newSingleThreadScheduledExecutor();
         inited = true;
      }
      catch (Exception e)
      {
         ourLogger.error("Exception initializing ScheduleResultReader", e);
      }
   }

   public static SomeInterface getInstance()
   {
      if (instance == null)
      {
         instance = new MySingletonClass();
      }

      return instance;
   }

}