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https://issues.apache.org/jira/browse/KARAF-3798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15380661#comment-15380661
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Alexey Markevich commented on KARAF-3798:
-----------------------------------------
even after this fix a parallel call (3 in my case) to
{code}
featuresService.installFeature(feature, FEATURE_OPTIONS);
{code}
and after
{code}
featuresService.uninstallFeature(id, version, FEATURE_OPTIONS);
{code}
cause "Feature named 'id/version' is not installed"
> FeaturesServiceImpl not threadsafe
> ----------------------------------
>
> Key: KARAF-3798
> URL: https://issues.apache.org/jira/browse/KARAF-3798
> Project: Karaf
> Issue Type: Bug
> Components: karaf-feature
> Affects Versions: 4.0.0.M3
> Reporter: Fabian Lange
> Assignee: Jean-Baptiste Onofré
> Fix For: 4.1.0, 4.0.6
>
> Attachments: Screen Shot 2016-06-24 at 12.57.40.png
>
>
> This error happens pretty frequently with M3, when there are multiple
> features installed on startup and config files to activate them created.
> {code}
> 2015-06-19 15:55:12,249 | ERROR | 43-3aaf88a7bd8b) | configadmin
> | 3 - org.apache.felix.configadmin - 1.8.4 | Unexpected problem
> delivering configuration event to [org.osgi.service.cm.ConfigurationListener,
> id=30, bundle=9/mvn:org.apache.felix/org.apache.felix.scr/1.8.2]
> java.lang.NullPointerException
> at
> org.apache.felix.scr.impl.config.ConfigurationSupport.configurationEvent(ConfigurationSupport.java:283)[9:org.apache.felix.scr:1.8.2]
> at
> org.apache.felix.cm.impl.ConfigurationManager$FireConfigurationEvent.sendEvent(ConfigurationManager.java:2036)[3:org.apache.felix.configadmin:1.8.4]
> at
> org.apache.felix.cm.impl.ConfigurationManager$FireConfigurationEvent.run(ConfigurationManager.java:2005)[3:org.apache.felix.configadmin:1.8.4]
> at
> org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:103)[3:org.apache.felix.configadmin:1.8.4]
> at java.lang.Thread.run(Thread.java:745)[:1.8.0_40]
> {code}
> As written in latest comment, the root cause seems to be that multiple
> installFeature calls to FeatureService mess up the state of the bundles. In
> my case it left a bundle in a corrupt state, which was noticed when the
> configuration change did not really activate the service.
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