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https://issues.apache.org/jira/browse/SLING-3474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13983041#comment-13983041
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Carsten Ziegeler commented on SLING-3474:
-----------------------------------------
Actually the underlying problem is the same as described in SLING-3522.
> Concurrent modification exception in installer
> ----------------------------------------------
>
> Key: SLING-3474
> URL: https://issues.apache.org/jira/browse/SLING-3474
> Project: Sling
> Issue Type: Bug
> Components: Installer
> Affects Versions: Installer Core 3.5.0
> Reporter: Carsten Ziegeler
> Assignee: Carsten Ziegeler
> Fix For: Installer Core 3.5.2
>
>
> The following exception might occur:
> 12.03.2014 23:21:49.899 *WARN* [CM Event Dispatcher (Fire ConfigurationEvent:
> pid=org.apache.sling.engine.impl.auth.SlingAuthenticator)]
> org.apache.sling.installer.core.impl.PersistentResourceList Unable to save
> persistent list: null
> java.util.ConcurrentModificationException: null
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:926)
> at java.util.HashMap$EntryIterator.next(HashMap.java:966)
> at java.util.HashMap$EntryIterator.next(HashMap.java:964)
> at java.util.HashMap.writeObject(HashMap.java:1131)
> at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
> at
> org.apache.sling.installer.core.impl.PersistentResourceList.save(PersistentResourceList.java:166)
> at
> org.apache.sling.installer.core.impl.OsgiInstallerImpl.resourceAddedOrUpdated(OsgiInstallerImpl.java:965)
> at
> org.apache.sling.installer.factories.configuration.impl.ConfigTaskCreator.configurationEvent(ConfigTaskCreator.java:138)
> at
> org.apache.felix.cm.impl.ConfigurationManager$FireConfigurationEvent.sendEvent(ConfigurationManager.java:2032)
> at
> org.apache.felix.cm.impl.ConfigurationManager$FireConfigurationEvent.run(ConfigurationManager.java:2002)
> at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:103)
> at java.lang.Thread.run(Thread.java:744)
> While the installer works under the assumption that only the main thread can
> modify the installer state, the writeback mechanism can actually also change
> and persists state (as seen above). Therefore the code needs to be guarded
> against concurrent access.
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