NullPointerException at JcrResourceResolverFactoryImpl.getResourceResolver in AEM

Issue

The following error is observed in the AEM log files:

31.05.2017 17:00:00.003 *ERROR* [sling-default-1000-HourlySnapshotJob] org.apache.sling.commons.scheduler.impl.QuartzScheduler Exception during job execution of com.day.cq.reporting.impl.snapshots.SnapshotServiceImpl$2@1a639a76 : null
java.lang.NullPointerException: null
at org.apache.sling.jcr.resource.internal.JcrResourceResolverFactoryImpl.getResourceResolver(JcrResourceResolverFactoryImpl.java:125)
at org.apache.sling.jcr.resource.internal.JcrResourceResolverFactoryImpl.getResourceResolver(JcrResourceResolverFactoryImpl.java:94)
at com.day.cq.reporting.impl.snapshots.SnapshotServiceImpl.executeSnapshot(SnapshotServiceImpl.java:274)
at com.day.cq.reporting.impl.snapshots.SnapshotServiceImpl$2.run(SnapshotServiceImpl.java:160)
at org.apache.sling.commons.scheduler.impl.QuartzJobExecutor.execute(QuartzJobExecutor.java:118)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Environment

AEM 6.2

Cause

This happens when a class holds reference to a JcrResourceResolverFactory class instance which was deactivated. When a component is deactivated and activated again, a new instance is created. Therefore, if someone keeps hold of the old instance, the references are null and never set again. This NullPointerException happens when a method call is made on a field injected via Felix SCR. The field should really have a value since the method call was initiated from an activate() call which is also initiated by SCR.

Resolution

​This issue is resolved in version 2.0.8 of the Apache Felix SCR library. To fix the issue, install the newer version:

  1. Download version 2.0.8 of the felix.scr bundle.
  2. Stop AEM.
  3. Place the file under crx-quickstart/install folder of the AEM instance.
  4. Start AEM.

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