ConcurrentModificationException in ExtensibleContributionListener
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Key: TUSCANY-2092
URL: https://issues.apache.org/jira/browse/TUSCANY-2092
Project: Tuscany
Issue Type: Bug
Reporter: Greg Dritschler
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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