The DuplicateIDCache will not work: - The MessageID lookup could fail in two circunstances: I - on deliverReplicated, where we need to temporarily remove the messages from the Queue and place it on deliveringRefs. II - On replicating acknoledgement... as I could fail On I, we can't really add anything to duplicateIDCache, as the ID wasn't even delivered yet. I have created a Branch with my current changes: https://svn.jboss.org/repos/messaging/branches/Branch_Failover_Page And PagingfailoverTest will pass with this Hack on QueueImpl: // This is a temporary hack, for the temporary branch only | for (int i = 0; i < 10; i++) | { | System.out.println("Retry " + i); | Thread.sleep(100); | | ref = removeReferenceWithID(id, false); | | if (ref != null) | { | System.out.println("Finally found it:"); | break; | } | } | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4200477#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...