[SLING-4847] NullPointerException in MapEntries handleEvent

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Resource Resolver 1.1.14
• Fix Version/s: Resource Resolver 1.2.6
• Component/s: ResourceResolver
• Assignee: Antonio Sanso
• Reporter: Chetan Mehrotra
• Created: 01/Jul/15 04:46
• Updated: 21/Jul/15 10:56
• Resolved: 02/Jul/15 08:01

Description

On a running system at times following exceptions are seen

30.06.2015 09:00:34.108 *WARN* [pool-5-thread-115] org.apache.felix.eventadmin Service [Map Entries Observation,1094] EventAdmin: Exception during event dispatch [org.osgi.service.event.Event [topic=org/apache/sling/api/resource/Resource/ADDED] | [org.osgi.service.event.EventHandler] | Bundle(org.apache.sling.resourceresolver [211])] (java.lang.NullPointerException)
java.lang.NullPointerException: null
	at org.apache.sling.resourceresolver.impl.mapping.MapEntries.doNodeAdded(MapEntries.java:300)
	at org.apache.sling.resourceresolver.impl.mapping.MapEntries.handleEvent(MapEntries.java:769)
	at org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:412)
	at org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:118)
	at org.apache.felix.eventadmin.impl.handler.EventAdminImpl.sendEvent(EventAdminImpl.java:114)
	at org.apache.felix.eventadmin.impl.security.EventAdminSecurityDecorator.sendEvent(EventAdminSecurityDecorator.java:96)
	at org.apache.sling.jcr.resource.internal.OakResourceListener.sendOsgiEvent(OakResourceListener.java:243)
	at org.apache.sling.jcr.resource.internal.OakResourceListener.added(OakResourceListener.java:109)
	at org.apache.jackrabbit.oak.plugins.observation.NodeObserver$NodeEventHandler.leave(NodeObserver.java:209)
	at org.apache.jackrabbit.oak.plugins.observation.FilteredHandler.leave(FilteredHandler.java:51)
	at org.apache.jackrabbit.oak.plugins.observation.EventGenerator$Continuation.run(EventGenerator.java:182)
	at org.apache.jackrabbit.oak.plugins.observation.EventGenerator.generate(EventGenerator.java:124)
	at org.apache.jackrabbit.oak.plugins.observation.NodeObserver.contentChanged(NodeObserver.java:163)
	at org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:124)
	at org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:118)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

Looking at code the resource might be null by the time event is processed. So code should guard against that