NPE thrown by JcrObservationManager/JcrListener

11.01.2012 11:26:12 ERROR [org.apache.jackrabbit.core.observation.ObservationDispatcher.dispatchEvents():216] Synchronous EventConsumer threw exception.
java.lang.NullPointerException
at org.hippoecm.frontend.JcrObservationManager$JcrListener.onEvent(JcrObservationManager.java:309)
at org.hippoecm.repository.impl.WorkspaceDecorator$EventListenerDecorator.onEvent(WorkspaceDecorator.java:276)
at org.apache.jackrabbit.core.observation.EventConsumer.consumeEvents(EventConsumer.java:248)
at org.apache.jackrabbit.core.observation.ObservationDispatcher.dispatchEvents(ObservationDispatcher.java:214)
at org.apache.jackrabbit.core.observation.EventStateCollection.dispatch(EventStateCollection.java:475)
at org.apache.jackrabbit.core.state.SharedItemStateManager$Update.end(SharedItemStateManager.java:798)
at org.apache.jackrabbit.core.state.SharedItemStateManager.update(SharedItemStateManager.java:1498)
at org.hippoecm.repository.jackrabbit.HippoSharedItemStateManager.update(HippoSharedItemStateManager.java:62)
at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:398)
at org.apache.jackrabbit.core.state.ForkedXAItemStateManager.update(ForkedXAItemStateManager.java:357)
at org.hippoecm.repository.jackrabbit.HippoLocalItemStateManager.update(HippoLocalItemStateManager.java:279)
at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:373)
at org.hippoecm.repository.jackrabbit.HippoLocalItemStateManager.update(HippoLocalItemStateManager.java:288)
at org.apache.jackrabbit.core.state.SessionItemStateManager.update(SessionItemStateManager.java:274)
at org.apache.jackrabbit.core.ItemSaveOperation.perform(ItemSaveOperation.java:258)
at org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:200)
at org.apache.jackrabbit.core.ItemImpl.perform(ItemImpl.java:91)
at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:329)
at org.hippoecm.repository.decorating.ItemDecorator.save(ItemDecorator.java:144)
at org.hippoecm.repository.impl.NodeDecorator.save(NodeDecorator.java:89)
at org.hippoecm.repository.standardworkflow.EventLoggerImpl.addLogNode(EventLoggerImpl.java:207)
at org.hippoecm.repository.standardworkflow.EventLoggerImpl.logWorkflowStep(EventLoggerImpl.java:93)
at org.hippoecm.repository.impl.WorkflowManagerImpl$WorkflowInvocationHandler.invoke(WorkflowManagerImpl.java:622)
at $Proxy54.logEvent(Unknown Source)
at org.hippoecm.frontend.model.JcrSessionModel.flush(JcrSessionModel.java:80)
at org.hippoecm.frontend.model.JcrSessionModel.detach(JcrSessionModel.java:123)
at org.hippoecm.frontend.session.UserSession.releaseJcrSession(UserSession.java:209)
at org.hippoecm.frontend.session.UserSession.unbind(UserSession.java:344)
at org.hippoecm.frontend.session.UnbindingHttpSessionStore.onUnbind(UnbindingHttpSessionStore.java:81)
at org.apache.wicket.protocol.http.AbstractHttpSessionStore.unbind(AbstractHttpSessionStore.java:281)
at org.apache.wicket.protocol.http.AbstractHttpSessionStore$SessionBindingListener.valueUnbound(AbstractHttpSessionStore.java:97)
at org.apache.catalina.session.StandardSession.removeAttributeInternal(StandardSession.java:1710)
at org.apache.catalina.session.StandardSession.expire(StandardSession.java:812)
at org.apache.catalina.session.StandardSession.isValid(StandardSession.java:587)
at org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:714)
at org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:699)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1368)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1653)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1662)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1662)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1642)
at java.lang.Thread.run(Unknown Source)