<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body link="#355491" alink="#4262a1" vlink="#355491" style="background: #e2e2e2; margin: 0; padding: 20px;">
<div>
<table cellpadding="0" bgcolor="#FFFFFF" border="0" cellspacing="0" style="border: 1px solid #dadada; margin-bottom: 30px; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td>
<table border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" style="border: solid 2px #ccc; background: #dadada; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td bgcolor="#000000" valign="middle" height="58px" style="border-bottom: 1px solid #ccc; padding: 20px; -moz-border-radius-topleft: 3px; -moz-border-radius-topright: 3px; -webkit-border-top-right-radius: 5px; -webkit-border-top-left-radius: 5px;">
<h1 style="color: #333333; font: bold 22px Arial, Helvetica, sans-serif; margin: 0; display: block !important;">
<!-- To have a header image/logo replace the name below with your img tag -->
<!-- Email clients will render the images when the message is read so any image -->
<!-- must be made available on a public server, so that all recipients can load the image. -->
<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
</td>
</tr>
<tr>
<td bgcolor="#FFFFFF" style="font: normal 12px Arial, Helvetica, sans-serif; color:#333333; padding: 20px; -moz-border-radius-bottomleft: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 5px; -webkit-border-bottom-left-radius: 5px;"><h3 style="margin: 10px 0 5px; font-size: 17px; font-weight: normal;">
ConcurrentModificationException at ChannelSupport.deliverInternal
</h3>
<span style="margin-bottom: 10px;">
created by <a href="http://community.jboss.org/people/mclu">Markus Lutum</a> in <i>JBoss Messaging</i> - <a href="http://community.jboss.org/message/580205#580205">View the full discussion</a>
</span>
<hr style="margin: 20px 0; border: none; background-color: #dadada; height: 1px;">
<div class="jive-rendered-content"><p>Hi out there.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>We are using Messaging 1.4.5 GA and got twice this error in production at 2 different systems:</p><p>Any ideas about the problem? Should we update to 1.4.7? </p><p>It could be that we had a short network issue on that machine but application and database is on the same machine.</p><p>Also I whould not expect a concurrentModificationException if this happens. It the network the root cause and what happens with the system if this happend?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>THX</p><p>Markus</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>15:36:11,000 WARN  [org.jboss.jms.server.endpoint.ServerSessionEndpoint] No expiry queue has been configured so removing expired</p><p>Reference[23298596871307270]:RELIABLE</p><p>15:36:11,015 WARN  [org.jboss.jms.server.endpoint.ServerSessionEndpoint] No expiry queue has been configured so removing expired</p><p>Reference[23298608005775380]:RELIABLE</p><p>15:36:11,015 WARN  [org.jboss.jms.server.endpoint.ServerSessionEndpoint] No expiry queue has been configured so removing expired</p><p>Reference[23298608312483861]:RELIABLE</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>15:36:11,031 ERROR [org.jboss.messaging.core.impl.ChannelSupport] Queue[26556037/1/2-notifications_mediumretry] Failed to deliver</p><p>java.util.ConcurrentModificationException</p><p>        at java.util.LinkedList$ListItr.checkForComodification(Unknown Source)</p><p>        at java.util.LinkedList$ListItr.remove(Unknown Source)</p><p>        at</p><p>org.jboss.messaging.util.prioritylinkedlist.BasicPriorityLinkedList$PriorityLinkedListIterator.remove(BasicPriorityLinkedList.java:295)</p><p>        at</p><p>org.jboss.messaging.core.impl.ChannelSupport.deliverInternal(ChannelSupport.java:729)</p><p>        at</p><p>org.jboss.messaging.core.impl.MessagingQueue.deliverInternal(MessagingQueue.java:506)</p><p>        at</p><p>org.jboss.messaging.core.impl.ChannelSupport.acknowledgeInternal(ChannelSupport.java:844)</p><p>        at</p><p>org.jboss.messaging.core.impl.ChannelSupport.acknowledge(ChannelSupport.java:290)</p><p>        at</p><p>org.jboss.messaging.core.impl.SimpleDelivery.acknowledge(SimpleDelivery.java:103)</p><p>        at</p><p>org.jboss.jms.server.endpoint.ServerSessionEndpoint.expireDelivery(ServerSessionEndpoint.java:1109)</p><p>        at</p><p>org.jboss.jms.server.endpoint.ServerConsumerEndpoint.handle(ServerConsumerEndpoint.java:236)</p><p>        at</p><p>org.jboss.messaging.core.impl.RoundRobinDistributor.handle(RoundRobinDistributor.java:119)</p><p>        at</p><p>org.jboss.messaging.core.impl.MessagingQueue$DistributorWrapper.handle(MessagingQueue.java:583)</p><p>        at</p><p>org.jboss.messaging.core.impl.ClusterRoundRobinDistributor.handle(ClusterRoundRobinDistributor.java:79)</p><p>        at</p><p>org.jboss.messaging.core.impl.ChannelSupport.deliverInternal(ChannelSupport.java:665)</p><p>        at</p><p>org.jboss.messaging.core.impl.MessagingQueue.deliverInternal(MessagingQueue.java:506)</p><p>        at</p><p>org.jboss.messaging.core.impl.ChannelSupport.acknowledgeInternal(ChannelSupport.java:844)</p><p>        at</p><p>org.jboss.messaging.core.impl.ChannelSupport.acknowledge(ChannelSupport.java:290)</p><p>        at</p><p>org.jboss.messaging.core.impl.SimpleDelivery.acknowledge(SimpleDelivery.java:103)</p><p>        at</p><p>org.jboss.jms.server.endpoint.ServerSessionEndpoint.expireDelivery(ServerSessionEndpoint.java:1109)</p><p>        at</p><p>org.jboss.jms.server.endpoint.ServerConsumerEndpoint.handle(ServerConsumerEndpoint.java:236)</p><p>        at</p><p>org.jboss.messaging.core.impl.RoundRobinDistributor.handle(RoundRobinDistributor.java:119)</p><p>        at</p><p>org.jboss.messaging.core.impl.MessagingQueue$DistributorWrapper.handle(MessagingQueue.java:583)</p><p>        at</p><p>org.jboss.messaging.core.impl.ClusterRoundRobinDistributor.handle(ClusterRoundRobinDistributor.java:79)</p><p>        at</p><p>org.jboss.messaging.core.impl.ChannelSupport.deliverScheduled(ChannelSupport.java:763)</p><p>        at</p><p>org.jboss.messaging.core.impl.ChannelSupport$DeliverRefTimeoutTarget.timedOut(ChannelSupport.java:1151)</p><p>        at</p><p>org.jboss.util.timeout.TimeoutFactory$TimeoutWorker.run(TimeoutFactory.java:265)</p><p>        at</p><p>org.jboss.util.threadpool.RunnableTaskWrapper.run(RunnableTaskWrapper.java:148)</p><p>        at</p><p>EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:756)</p><p>        at java.lang.Thread.run(Unknown Source)</p></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/580205#580205">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in JBoss Messaging at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2042">Community</a></p>
</div></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>