Creating a subclass of StandardEmitterMBean could be simplified by removing the necessity to create a NotificationEmitter instance.  Currently you have to do something like this:

public class MyEmitter extends StandardEmitterMBean implements MyMBean {
    public MyEmitter() {
        super(MyMBean.class, makeNotificationEmitter());
    }

    private static final MBeanNotificationInfo notificationInfo =
        new MBeanNotificationInfo(new String[] {"a.b", "c.d"},
                                  Notification.class.getName(),
                                  "Description");

    private static NotificationEmitter makeNotificationEmitter() {
        return new NotificationBroadcasterSupport(notificationInfo);
    }
}

It would be nice to be able to do this instead:

public class MyEmitter extends StandardEmitterMBean implements MyMBean {
    public MyEmitter() {
        super(this, MyMBean.class);
    }

    private static final MBeanNotificationInfo notificationInfo =
        new MBeanNotificationInfo(new String[] {"a.b", "c.d"},
                                  Notification.class.getName(),
                                  "Description");

    @Override
    public MBeanNotificationInfo[] getNotificationInfo() {
        return notificationInfo;
    }
}

The current need to construct the NotificationEmitter within the superconstructor call is not obvious, and this simpler pattern would be more so.

This change does not imply a change to the API signature but it does imply changing the implementation.  Currently the replacement code above will lead to an infinite recursion.