Receiving notification from other MBeans

[joshua883]

Hi all!
I'm trying to receive notifications from a simple MBean component. The MBean (taken from wikis) simply dumps a Message when the operation printMessage is invoked:

public class StartupService extends ServiceMBeanSupport implements StartupServiceMBean
{
 // Our message attribute
 private String message = "Sorry no message today";

 // Getters and Setters
 public String getMessage()
 {
 return message;
 }
 public void setMessage(String message)
 {
 this.message = message;
 }

 // The printMessage operation
 public void printMessage()
 {
 log.info(message);
 }

 // The lifecycle
 protected void startService() throws Exception
 {
 log.info("Starting with message=" + message);
 }
 protected void stopService() throws Exception
 {
 log.info("Stopping with message=" + message);
 }
}

The notification Listener (also taken from wikis) extends ListenerServiceMBeanSupport

public class NotificationListener
 extends ListenerServiceMBeanSupport
 implements NotificationListenerMBean
{
 // Constructors --------------------------------------------------
 /**
 * CTOR
 **/
 public NotificationListener()
 {
 // empty
 }

 // NotificationListenerMBean implementation ----------------------
 // No attributes or operations in this example to implement!

 // Lifecycle control (ServiceMBeanSupport) -----------------------
 /**
 * Start
 **/
 public void startService()
 throws Exception
 {
 // subscribe for notification, true=dynamic
 super.subscribe(true); // listener is me!
 }

 /**
 * Stop
 **/
 public void stopService()
 throws Exception
 {
 // unsubscribe for notifications
 super.unsubscribe();
 }

 // ListenerServiceMBeanSupport override ------------------------
 /**
 * Overriden to add handling!
 **/
 public void handleNotification2(Notification notification, Object handback)
 {
 log.info("Got notification: " + notification + ", handback: " + handback);
 }


}

Then I've tried to adapt the service xml file so that it receives notifications from the domain com.sample.jmx:

<mbean code="com.sample.jmx.StartupService" name="com.packtpub.jmx:service=StartupClass">
 <attribute name="Message">Hello World</attribute>
 </mbean>

 <server>
 <mbean code="jboss.example.NotificationListener"
 name="jboss.example:name=NotificationListener">

 <attribute name="SubscriptionList">
 <subscription-list>
 <mbean name="*:service=invoker,*" handback="anObject"></mbean>
 <mbean name="com.sample.jmx:*"></mbean>

 <notification type="JBOSS_MONITOR_NOTIFICATION"></notification>
 <mbean name="JMImplementation:type=MBeanServerDelegate">
 <notification type="JMX.mbean.registered"></notification>
 </mbean>
 </subscription-list>
 </attribute>
 </mbean>
 </server>

Unfortunately I don't receive any notification when the method printMessage is invoked....have you got any idea what's wrong?
JBoss release used 5.0.0 GA with JDK 1.6
Thanks a lot
John

[dimitris]

Your subscription list is wrong, so try an mbean descriptor like this:

<mbean code="com.sample.jmx.StartupService" name="com.packtpub.jmx:service=StartupClass">
 <attribute name="Message">Hello World</attribute>
 </mbean>

 <server>
 <mbean code="jboss.example.NotificationListener"
 name="jboss.example:name=NotificationListener">

 <attribute name="SubscriptionList">
 <subscription-list>
 <mbean name="com.packtpub.jmx:service=StartupClass"/>
 </subscription-list>
 </attribute>
 </mbean>
 </server>

Your StartupClass does not emit any custom notification to show in your listener. The only notification that should come up are the ones from the base ServiceMBeanSupport class.

[dimitris]

Also the 'server' tag is at the wrong place. It should appear in the top.