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https://issues.apache.org/jira/browse/SLING-7456?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carsten Ziegeler closed SLING-7456.
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> FlushCache in SlingServletResolver can throw an NPE
> ---------------------------------------------------
>
> Key: SLING-7456
> URL: https://issues.apache.org/jira/browse/SLING-7456
> Project: Sling
> Issue Type: Bug
> Components: Servlets
> Affects Versions: Servlets Resolver 2.4.22
> Reporter: Karl Pauls
> Assignee: Carsten Ziegeler
> Priority: Minor
> Fix For: Servlets Resolver 2.4.24
>
>
> Given that we check for the this.cache being null everytime we reference the
> cache we should probably do the same in flushCache. I can't reproduce it but
> the NPE looked like this:
> {noformat}
> java.lang.NullPointerException: null
> at
> org.apache.sling.servlets.resolver.internal.SlingServletResolver.flushCache(SlingServletResolver.java:1122)
> [org.apache.sling.servlets.resolver:2.4.22]
> at
> org.apache.sling.servlets.resolver.internal.SlingServletResolver.onChange(SlingServletResolver.java:1464)
> [org.apache.sling.servlets.resolver:2.4.22]
> at
> org.apache.sling.resourceresolver.impl.observation.BasicObservationReporter.reportChanges(BasicObservationReporter.java:211)
> [org.apache.sling.resourceresolver:1.5.34]
> at
> org.apache.sling.jcr.resource.internal.JcrResourceListener.onEvent(JcrResourceListener.java:155)
> [org.apache.sling.jcr.resource:3.0.8]
> at
> org.apache.jackrabbit.commons.observation.ListenerTracker$1.onEvent(ListenerTracker.java:190)
> [org.apache.jackrabbit.jackrabbit-jcr-commons:2.16.0]
> at
> org.apache.jackrabbit.oak.jcr.observation.ChangeProcessor.contentChanged(ChangeProcessor.java:508)
> [org.apache.jackrabbit.oak-jcr:1.8.1]
> at
> org.apache.jackrabbit.oak.plugins.observation.FilteringDispatcher.contentChanged(FilteringDispatcher.java:53)
> [org.apache.jackrabbit.oak-core:1.8.1]
> at
> org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:128)
> [org.apache.jackrabbit.oak-store-spi:1.8.1]
> at
> org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:122)
> [org.apache.jackrabbit.oak-store-spi:1.8.1]
> at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
> at java.base/java.lang.Thread.run(Thread.java:844)
> {noformat}
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