[jira] Closed: (TUSCANY-2092) ConcurrentModificationException in ExtensibleContributionListener

["Simon Laws (JIRA)" <tu...@ws.apache.org>]

     [ https://issues.apache.org/jira/browse/TUSCANY-2092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Laws closed TUSCANY-2092.
-------------------------------

    Resolution: Fixed

Thanks for the patch Ram. Committed at 657093

> ConcurrentModificationException in ExtensibleContributionListener
> -----------------------------------------------------------------
>
>                 Key: TUSCANY-2092
>                 URL: https://issues.apache.org/jira/browse/TUSCANY-2092
>             Project: Tuscany
>          Issue Type: Bug
>            Reporter: Greg Dritschler
>            Assignee: Simon Laws
>             Fix For: Java-SCA-Next
>
>         Attachments: JIRA-2092.patch, TUSCANY-2092.patch
>
>
> java.util.ConcurrentModificationException
> 	at java.util.AbstractList$SimpleListIterator.next(Unknown Source)
> 	at org.apache.tuscany.sca.contribution.service.ExtensibleContributionListener.contributionAdded(ExtensibleContributionListener.java:40)
> 	at org.apache.tuscany.sca.contribution.service.impl.ContributionServiceImpl.addContribution(ContributionServiceImpl.java:389)
> 	at org.apache.tuscany.sca.contribution.service.impl.ContributionServiceImpl.contribute(ContributionServiceImpl.java:202)
> The problem occurs if two threads try to add a contribution simultaneously.
> DefaultContributionListenerExtensionPoint does not synchronize the list of listeners.  In particular loadListeners does not prevent multiple threads from trying to load the list of listeners.  One thread completes first while the other is still loading.  This leads to the exception shown above when a thread tries to iterate the listener list.

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