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https://issues.apache.org/jira/browse/SLING-4867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15579689#comment-15579689
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Carsten Ziegeler commented on SLING-4867:
-----------------------------------------

Reopening as I'm seeing this now happening a lot in the launchpad integration 
tests.
The problem is that even getXXX methods change the state by sorting the array - 
this sorting is needed to avoid other problems with the sort order (we had them 
before)

> EntityResourceList should be thread-safe
> ----------------------------------------
>
>                 Key: SLING-4867
>                 URL: https://issues.apache.org/jira/browse/SLING-4867
>             Project: Sling
>          Issue Type: Bug
>          Components: Installer
>    Affects Versions: Installer Core 3.6.6
>            Reporter: Julian Sedding
>            Assignee: Carsten Ziegeler
>             Fix For: Installer Core 3.6.10
>
>
> There was a Jenkins test failure\[0\] due to the following exception. This 
> looks like {{EntityResourceList}} should be thread-safe.
> [~cziegeler], I took the liberty to assign the issue to you. Hope that's ok.
> {noformat}
> Exception in thread "OsgiInstallerImpl" 
> java.util.ConcurrentModificationException
>       at java.util.ArrayList.sort(ArrayList.java:1456)
>       at java.util.Collections.sort(Collections.java:141)
>       at 
> org.apache.sling.installer.core.impl.EntityResourceList.getActiveResource(EntityResourceList.java:125)
>       at 
> org.apache.sling.installer.factories.configuration.impl.ConfigTaskCreator.createTask(ConfigTaskCreator.java:71)
>       at 
> org.apache.sling.installer.core.impl.OsgiInstallerImpl.getTask(OsgiInstallerImpl.java:632)
>       at 
> org.apache.sling.installer.core.impl.OsgiInstallerImpl.computeTasks(OsgiInstallerImpl.java:612)
>       at 
> org.apache.sling.installer.core.impl.OsgiInstallerImpl.run(OsgiInstallerImpl.java:262)
>       at java.lang.Thread.run(Thread.java:745)
> {noformat}
> \[0\] https://builds.apache.org/job/sling-trunk-1.8/1292/



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