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https://issues.apache.org/jira/browse/SLING-6640?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karl Pauls reassigned SLING-6640:
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Assignee: Karl Pauls
> Race condition in JCR Contentloader deactivate can cause NullPointerException.
> ------------------------------------------------------------------------------
>
> Key: SLING-6640
> URL: https://issues.apache.org/jira/browse/SLING-6640
> Project: Sling
> Issue Type: Bug
> Components: JCR
> Affects Versions: JCR ContentLoader 2.1.10
> Reporter: Karl Pauls
> Assignee: Karl Pauls
> Fix For: JCR ContentLoader 2.2.0
>
>
> The ContentLoaderService registers itself as a SynchronousBundleListener with
> the framework on activate and unregisters in the deactivate method. After it
> unregistered it turns around and first calls:
> this.bundleContentLoader.dispose();
> and then the bundleContentLoader is set to null. The bundleContentLoader is
> used in the bundleChanged(BundleEvent) callback of the listener interface.
> There seems to be an assumption that there will be no more events received
> after the unregistering as a listener - however, that assumption doesn't
> hold. The framework gets a snapshot of listeners and calls them so there is a
> window where bundleChanged can be invoked after the call to
> bundleContentLoader.dispose() or after it is set to null.
> Both cases can lead to an NPE (either in the bundleChanged directly because
> the bundleContentLoader is null already or inside the bundleContentLoader
> itself as it has been disposed) when there is a race between the service
> being deactivated and a bundle changing state concurrently.
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