[jboss-jira] [JBoss JIRA] Closed: (JBMESSAGING-1429) ConcurrentModificationException is thrown from JBM MessagingQueue.java

[Tim Fox (JIRA)]

     [ https://jira.jboss.org/jira/browse/JBMESSAGING-1429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Fox closed JBMESSAGING-1429.
--------------------------------

    Resolution: Done
      Assignee: Clebert Suconic  (was: Tim Fox)


> ConcurrentModificationException is thrown from JBM MessagingQueue.java
> ----------------------------------------------------------------------
>
>                 Key: JBMESSAGING-1429
>                 URL: https://jira.jboss.org/jira/browse/JBMESSAGING-1429
>             Project: JBoss Messaging
>          Issue Type: Bug
>    Affects Versions: 1.4.0.SP3.CP02
>         Environment: Sybase ASE 15.02,  JDBC Driver jTDS 1.2.1, JBoss-EAP-4.3_CP1, JDK -1.5.0_10
>            Reporter: Tyronne Wickramarathne
>            Assignee: Clebert Suconic
>             Fix For: 1.4.0.SP3.CP05, 1.4.1.GA
>
>
> 2008-10-08 17:57:44,955 [WorkerThread#18[10.0.15.102:49566]] ERROR org.jboss.messaging.util.ExceptionUtil - ConsumerEndpoint[g7-swt4i2mf-1-8mfqh2mf-h5u36p-x2f0a] close [i7-rwu4i2mf-1-8mfqh2mf-h5u36p-x2f0a]
> java.util.ConcurrentModificationException
>       at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841)
>       at java.util.HashMap$KeyIterator.next(HashMap.java:877)
> I couldn't reproduce this problem locally. However, I have noted the code segment which leads to this problem. This exception is thrown when unregisterSucker() or registerSucker() is called by the time the HashSet containing suckers are iterated. Replacing the HashSet with ConcurrentHashMap is the easiest fix it seems though the other approach is to use synchronized(lock) in the informSuckers().

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