How can I receive notification when Servlet stats change ?

[francis1970]

Hi all !
I'd need to add a notification listener that warns me when Servlet stats change. Until now I have been using successfully this code for my MBeans notifications

NotificationListener notificationListener = new NotificationListener() {
 public void handleNotification(Notification notification, Object handback) {
 System.out.println("Notification received!");
 System.out.println("UserObject: " + notification.getUserData());
 }
};
try {

 ArrayList servers = MBeanServerFactory.findMBeanServer(null);
 if (servers == null)
 throw new Exception("No MBeanServer found.");
 MBeanServer server = (MBeanServer)servers.get(0);

 // find the local MBeanServer
 ObjectName objectName = new ObjectName("jboss.management.local:J2EEApplication=null,J2EEServer=Local,WebModule=stats.war,j2eeType=Servlet,name=ControllerServlet");
 server.addNotificationListener(objectName, notificationListener, null, null);

 Thread.sleep(20000);
} catch (MalformedObjectNameException ex) {
 // manage
} catch (InstanceNotFoundException ex) {
 // manage
}

Anyway once I have registered to my Servlet nothing happens, even if the stats change (because I invoke my Servlet).
How can I get notification when my Servlet "ControllerServlet" is invoked ?

Thanks a lot
Francesco

[jaikiran]

What exactly does stats change mean? JBoss emits the following notifications http://wiki.jboss.org/wiki/NotificationsEmittedByJBossMBeans

[francis1970]

There's an attribute called "stats" tied to that Object. You can retreive it with:

org.jboss.management.j2ee.statistics.ServletStatsImpl obj =
 (org.jboss.management.j2ee.statistics.ServletStatsImpl )server.getAttribute( objName,
 "stats");


 javax.management.j2ee.statistics.TimeStatistic time = obj.getServiceTime();

 System.out.println(time.getCount());
 System.out.println(time.getDescription());
 System.out.println(time.getLastSampleTime());
 System.out.println(time.getMaxTime());
 System.out.println(time.getMinTime());
 out.println(time.getTotalTime());

I'd like to receive a notification when this attribute is changed (that is when servlet are invoked)...is it possible ?
thanks
Francesco