3 Replies Latest reply on Nov 8, 2006 4:46 AM by mskonda

    Why am I not receiving Notifications?


      My primary goal is to receive notifications from Naming (JNDI) MBean - that is, receive notifications for any additions or deletions or modificatios to the JNDI namespace.

      I have followed the wiki ListenerServiceMBeanSupport example and created a dummy notication lsitener which just prints out the info messages.

      The xxx-service.xml is given below:

      <?xml version="1.0" encoding="UTF-8"?>
       <mbean code="com.cmi2.facility.notifications.JNDINotificationListener"
       <attribute name="SubscriptionList">
       <mbean name="jboss:service=Naming">
       <filter factory="AttributeChangeNotificationFilterFactory">
       <enable attribute-name="State"/>
       <enable attribute-name="Name"/>
       <enable attribute-name="MethodMap"/>

      Unfortunately I can't get see any notifications received when I bind/unbind objects to the jndi namespace.

      My listener is below:
      public class JNDINotificationListener extends ListenerServiceMBeanSupport
       implements JNDINotificationListenerMBean {
       * Logger
       private Logger logger =
       public JNDINotificationListener()
       logger.info("JNDINotificationListener constructor");
       public void startService() throws Exception
       public void stopService() throws Exception
       public void handleNotification2(Notification n, Object handBack)
       logger.info("Received Notification: "+n+", handback: "+handBack);

      Ideally i want to extend the notification listeners for other services too..

      Any pointers to what I'm doing wrong?


        • 1. Re: Why am I not receiving Notifications?
          Dimitris Andreadis Master

          I don't remember if the naming service produces notifications when things are bound/unbound. Are you sure?

          • 2. Re: Why am I not receiving Notifications?

            I am assuming and expecting Naming MBean to produce Notifications, but not sure it does. I'll check the source code to see if I can dig any info on this.

            If Naming MBean doesn't produce notifications as I assumed, do you know if any way I can achieve the same thing, Dimitris? Or is it easy for me to incorporate code change to produce notifications (perhaps feature request?)


            • 3. Re: Why am I not receiving Notifications?

              You are correct that the Naming service does not produce Notifications on bind/rebind/unbind operations (I'm looking at org.jnp.server.NamingServer.java).

              Well, as I have a requirement to listen to the notifications, I am wonderign the best way to proceed to incorporate notification broadcasting from NamingSever.

              I think I have two ways

              1. Incorporate notifications in NamingServer itself (this means I'll have to change the code)

              2. Extend NamingServer with notification broadcast support.

              I am not sure how the second point turns out to be.

              Any ideas/suggestions?