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https://issues.apache.org/jira/browse/CONFIGURATION-278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500622
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Emmanuel Bourg commented on CONFIGURATION-278:
----------------------------------------------
The configuration is not manually synchronized. Even if Commons Configuration
is not fully thread safe I think we can at least the most frequent failure
points in a multi threaded environment. The result could be unpredictable, but
the code shouldn't crash with an exception.
That makes me think that we could provide a SynchronizedConfiguration decorator
that may help people synchronizing their configurations.
> 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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