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https://issues.apache.org/jira/browse/SLING-3522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13983008#comment-13983008
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Carsten Ziegeler commented on SLING-3522:
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I think the methods of the ResourceChangeListener should not modify the state
directly but wait a cycle - like we do with new/updated resources.
> NPE on startup in ChangeStateTask.getSortKey
> --------------------------------------------
>
> Key: SLING-3522
> URL: https://issues.apache.org/jira/browse/SLING-3522
> Project: Sling
> Issue Type: Bug
> Components: Installer
> Affects Versions: Installer Core 3.5.0
> Reporter: Philipp Marx
> Assignee: Carsten Ziegeler
> Fix For: Installer Core 3.5.2
>
>
> ChangeStateTask.getSortKey will internally call getResource().getEntityId(),
> whereas getResource() might return null.
> I tracked this down on my system to be a concurrency issue where the
> ResourceState of the task is being updated from UNINSTALL to INSTALLED by an
> update event. Since the state is now INSTALLED getResource() will return null
> since it is checking for resource in state UNINSTALL oder INSTALL.
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