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https://issues.apache.org/jira/browse/QPID-4782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645489#comment-13645489
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Robbie Gemmell commented on QPID-4782:
--------------------------------------
r1476583 merged to the 0.22 release branch via: http://svn.apache.org/r1477567
> [Java Broker] ConnectionAdapter.getSessions() can cause a
> ConcurrentModificationException
> -----------------------------------------------------------------------------------------
>
> Key: QPID-4782
> URL: https://issues.apache.org/jira/browse/QPID-4782
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.20
> Reporter: Robbie Gemmell
> Assignee: Robbie Gemmell
> Fix For: 0.22
>
>
> Changes made via QPID-4760 exposed a defect in
> ConnectionAdapter.getSessions() which can cause a
> ConcurrentModificationException. This is due to unsafe use of map.remove()
> whilst iterating the map keyset. The code will be change to use an Iterator
> and call iterator.remove instead.
> Recent test failure stacktrace showing the issue:
> {noformat}
> IoReceiver - /127.0.0.1:60051 2013-04-26 15:25:31,050 ERROR
> [qpid.server.transport.ServerSessionDelegate] Exception processing command
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)
> at java.util.HashMap$KeyIterator.next(HashMap.java:841)
> at
> org.apache.qpid.server.model.adapter.ConnectionAdapter.getSessions(ConnectionAdapter.java:67)
> at
> org.apache.qpid.server.model.adapter.ConnectionAdapter.getSessionAdapter(ConnectionAdapter.java:97)
> at
> org.apache.qpid.server.model.adapter.QueueAdapter.getSessionAdapter(QueueAdapter.java:118)
> at
> org.apache.qpid.server.model.adapter.QueueAdapter.subscriptionRegistered(QueueAdapter.java:616)
> at
> org.apache.qpid.server.queue.SimpleAMQQueue.registerSubscription(SimpleAMQQueue.java:447)
> at
> org.apache.qpid.server.transport.ServerSessionDelegate.messageSubscribe(ServerSessionDelegate.java:266)
> at
> org.apache.qpid.server.transport.ServerSessionDelegate.messageSubscribe(ServerSessionDelegate.java:73)
> {noformat}
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