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https://issues.apache.org/jira/browse/SLING-5592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15184743#comment-15184743
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Stefan Egli commented on SLING-5592:
------------------------------------
fixed in http://svn.apache.org/viewvc?rev=1734045&view=rev
> rapid IdMapService activation/deactivation leaves background thread in limbo
> ----------------------------------------------------------------------------
>
> Key: SLING-5592
> URL: https://issues.apache.org/jira/browse/SLING-5592
> Project: Sling
> Issue Type: Bug
> Components: Extensions
> Affects Versions: Discovery Commons 1.0.10
> Reporter: Stefan Egli
> Assignee: Stefan Egli
> Priority: Minor
> Fix For: Discovery Commons 1.0.12
>
>
> IdMapService.activate starts a background thread that reads oak's
> discovery-lite descriptor to find the own ('{{me}}') id assigned, to then add
> a corresponding mapping of {{slingId -> discovery-lite id}} under
> {{/var/discovery/oak/idMap}}. After that's done, the background thread stops
> - but until that's not done, the thread retries every second (since the
> discovery-lite descriptor might require some time to be available).
> Consider a scenario where the IdMapService is activated then immediately
> deactivated again. Although unlikely, this might happen.
> The IdMapService will then have the 'slingSettings' removed ({{null}}) thus
> leading to a cascade of errors every second:
> {noformat}
> 07.03.2016 14:14:23.069 *ERROR* [IdMapService-initializer]
> org.apache.sling.discovery.commons.providers.spi.base.IdMapService
> initializer: could not init due to java.lang.NullPointerException
> java.lang.NullPointerException: null
> at
> org.apache.sling.discovery.commons.providers.spi.base.IdMapService.init(IdMapService.java:187)
> at
> org.apache.sling.discovery.commons.providers.spi.base.IdMapService.access$000(IdMapService.java:59)
> at
> org.apache.sling.discovery.commons.providers.spi.base.IdMapService$1.check(IdMapService.java:108)
> at
> org.apache.sling.discovery.commons.providers.spi.base.AbstractServiceWithBackgroundCheck$BackgroundCheckRunnable.run(AbstractServiceWithBackgroundCheck.java:77)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
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