notification-portlet-webapp/src/main/java/org/jasig/portlet/notice/service/AbstractNotificationService.java
@Override
    public NotificationResponse fetch(HttpServletRequest request) {
        logger.warn("Notification service '{}' was invoked by the portlet-agnostic API, but it " +
                "doesn't override fetch(HttpServletRequest)", getName());
        return NotificationResponse.EMPTY_RESPONSE;
    }
@Override
    public NotificationResponse fetch(HttpServletRequest request) {
        logger.warn("Notification service '{}' was invoked by the portlet-agnostic API, but it " +
                "doesn't override fetch(HttpServletRequest)", getName());
        return NotificationResponse.EMPTY_RESPONSE;
    }
Returns an empty collection and logs the event.  All concrete implementations of
{@link INotificationService} should override this method.  The log entries this method
produces are an indication that the service subclass is not ready for the post-Portlet API
world.