EJB3 MBean does not support NotificationBroadcaster

[jc7442]

I use EMBEDDED_JBOSS_BETA3

I deploy a MBean EJB3

@Service(objectName = InstrumentManagerMBean.MDBName)
@Management(InstrumentManagerMBean.class)
public class InstrumentManagerImpl extends NotificationBroadcasterSupport
 implements InstrumentManagerMBean {...

When I try to add a notification listener I have an exception:

MBeanServer mbs = (MBeanServer) MBeanServerFactory.findMBeanServer(null).iterator().next();
 ObjectName oName = new ObjectName(InstrumentManagerMBean.MDBName);
 System.out.println(mbs.isRegistered(oName));
 mbs.addNotificationListener(oName, new ClientListener(), null, null);

Exception in thread "main" javax.management.RuntimeOperationsException
 at org.jboss.mx.server.MBeanServerImpl.addNotificationListener(MBeanServerImpl.java:749)
 at fr.biomerieux.nextgen.commandexecutor.Main.main(Main.java:50)
Caused by: java.lang.IllegalArgumentException: The MBean nextGen:service=InstrumentManagerMBean exists but does not implement the NotificationBroadcaster interface.
 ... 2 more

Object rerieved in MBeanServerImpl is a ServiceMBeanDelegate . It is a delegate around my MBean. This delegate does not implement the NotificationBroadcaster . Consequently I cannot register to notification listeners.

Any idea to fix that issue ? I looks like an defect.