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From "Oliver Heger (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CONFIGURATION-426) ConcurrentModificationException is thrown from CompositeConfiguration.getList
Date Thu, 04 Nov 2010 20:38:47 GMT

    [ https://issues.apache.org/jira/browse/CONFIGURATION-426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928341#action_12928341
] 

Oliver Heger commented on CONFIGURATION-426:
--------------------------------------------

CompositeConfiguration is not thread-safe. If you add a new child configuration in one thread
while accessing the configuration in another thread, such ConcurrentModificationExceptions
can occur. Admitted, there is no explicit warning in the Javadocs, but the user's guide has
a general note about thread-safety of configuration implementations:

http://commons.apache.org/configuration/userguide/overview.html#Threading_issues

When using an instance as a singleton you have to provide proper synchronization yourself.

> ConcurrentModificationException  is thrown from CompositeConfiguration.getList
> ------------------------------------------------------------------------------
>
>                 Key: CONFIGURATION-426
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-426
>             Project: Commons Configuration
>          Issue Type: Bug
>          Components: Build
>            Reporter: Tamir Lahav
>
> ConcurrentModificationException  is thrown from CompositeConfiguration.getList although
the object is used as "read only". 
> Stack trace:
> java.util.ConcurrentModificationException
>     at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:632)
>     at java.util.LinkedList$ListItr.next(LinkedList.java:567)
>     at
> org.apache.commons.configuration.CompositeConfiguration.getList(CompositeConfiguration.java:294)
>     at
> org.apache.commons.configuration.AbstractConfiguration.getList(AbstractConfiguration.java:1108)

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