There is a problem about md-sal notification,disruptor never work as long as notification processor throws a excetion,such as below

Caused by: java.lang.NullPointerException
at com.zte.ngip.ipsdn.inventory.InventoryManager.onNodeRemoved(InventoryManager.java:75)
at org.opendaylight.yangtools.yang.binding.util.NotificationListenerInvoker.invokeNotification(NotificationListenerInvoker.java:91)
at org.opendaylight.controller.md.sal.binding.impl.BindingDOMNotificationListenerAdapter.onNotification(BindingDOMNotificationListenerAdapter.java:44)
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMNotificationRouterEvent.deliverNotification(DOMNotificationRouterEvent.java:50)
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMNotificationRouter$1.onEvent(DOMNotificationRouter.java:68)
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMNotificationRouter$1.onEvent(DOMNotificationRouter.java:65)
at com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:128)
... 3 more