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

Tue Oct 14 03:42:20 EDT 2008

ConcurrentModificationException is thrown from JBM MessagingQueue.java
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                 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: Tim Fox

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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