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

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().