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https://issues.apache.org/jira/browse/CONFIGURATION-278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500225
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Oliver Heger commented on CONFIGURATION-278:
--------------------------------------------
The internally used layoutData map should probably be better synchronized.
Just wondering: How can an event be received while the save() method is
executed? Is the PropertiesConfiguration object that is accessed by multiple
threads properly synchronized? We state that configurations need to be manually
synchronized if they are modified concurrently.
> ConcurrentModificationException in PropertiesConfigurationLayout
> ----------------------------------------------------------------
>
> Key: CONFIGURATION-278
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-278
> Project: Commons Configuration
> Issue Type: Bug
> Affects Versions: 1.4
> Reporter: Emmanuel Bourg
> Fix For: 1.5
>
>
> PropertiesConfigurationLayout is not thread safe, if a configuration event is
> received when the configuration is being saved, a
> ConcurrentModificationException is thrown :
> java.util.ConcurrentModificationException
> at
> org.apache.commons.collections.map.AbstractLinkedMap$LinkIterator.nextEntry(AbstractLinkedMap.java:555)
> at
> org.apache.commons.collections.map.AbstractLinkedMap$KeySetIterator.next(AbstractLinkedMap.java:455)
> at
> org.apache.commons.configuration.PropertiesConfigurationLayout.save(PropertiesConfigurationLayout.java:455)
> at
> org.apache.commons.configuration.PropertiesConfiguration.save(PropertiesConfiguration.java:410)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.save(AbstractFileConfiguration.java:517)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.save(AbstractFileConfiguration.java:484)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.save(AbstractFileConfiguration.java:451)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.save(AbstractFileConfiguration.java:425)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.save(AbstractFileConfiguration.java:373)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.possiblySave(AbstractFileConfiguration.java:725)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.clearProperty(AbstractFileConfiguration.java:764)
> at
> org.apache.commons.configuration.DataConfiguration.clearProperty(DataConfiguration.java:109)
> at
> org.apache.commons.configuration.AbstractConfiguration.setProperty(AbstractConfiguration.java:483)
> This happens easily in a multi threaded application using a central
> configuration with auto saved enabled.
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