[CONFIGURATION-278] ConcurrentModificationException in PropertiesConfigurationLayout

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.4
• Fix Version/s: 1.5
• Assignee: Unassigned
• Reporter: Emmanuel Bourg
• Created: 30/May/07 15:50
• Updated: 22/Aug/09 19:36
• Resolved: 17/Jun/07 19:43

Description

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.