All JBoss versions prior to 3.2.4 may have clustering generate this kind of exception 
under load:

2004-03-28 02:47:27,450 DEBUG [org.javagroups.DefaultPartition] [Sun Mar 28 02:47:27 
EST 2004] [ERROR] NAKACK.handleXmitRe 
  | q(): (requester=choqtap4:32794 (additional data: 19 bytes)) message with seqno=0 
not found in sent_msgs ! sent_msgs=18 17 
  | 16 15 14 13 12 11 10 9 8 7 6 5

This is due to an error in JGroup default protocol configuration. You can easily fix 
that by editing the file deploy/cluster-service.xml by reordering the UNICAST and 
pbcast.STABLE protocols. The ClusterPartition MBeans the becomes:

  <mbean code="org.jboss.ha.framework.server.ClusterPartition"
  |          name="jboss:service=DefaultPartition">
  |          
  |     <!-- Name of the partition being built -->
  |     <attribute name="PartitionName">DefaultPartition</attribute>
  |     <!-- Determine if deadlock detection is enabled -->
  |     <attribute name="DeadlockDetection">False</attribute>
  |     <!-- The JGroups protocol configuration -->
  |     <attribute name="PartitionConfig">
  |       <Config>
  |         <!-- UDP: if you have a multihomed machine,
  |              set the bind_addr attribute to the appropriate NIC IP address -->
  |         <!-- UDP: On Windows machines, because of the media sense feature
  |              being broken with multicast (even after disabling media sense)
  |              set the loopback attribute to true -->
  |         <UDP mcast_addr="228.1.2.3" mcast_port="45566"
  |              ip_ttl="32" ip_mcast="true"
  |              mcast_send_buf_size="800000" mcast_recv_buf_size="150000"
  |              ucast_send_buf_size="800000" ucast_recv_buf_size="150000"
  |              loopback="false" />
  |         <PING timeout="2000" num_initial_members="3"
  |               up_thread="true" down_thread="true" />
  |         <MERGE2 min_interval="10000" max_interval="20000" />
  |         <FD shun="true" up_thread="true" down_thread="true"
  |             timeout="2500" max_tries="5" />
  |         <VERIFY_SUSPECT timeout="3000" num_msgs="3"
  |                         up_thread="true" down_thread="true" />
  |         <pbcast.NAKACK gc_lag="50" retransmit_timeout="300,600,1200,2400,4800"
  |                        max_xmit_size="8192"
  |                        up_thread="true" down_thread="true" />
  |         <UNICAST timeout="300,600,1200,2400,4800" window_size="100" 
min_threshold="10"
  |                  down_thread="true" />
  |         <pbcast.STABLE desired_avg_gossip="20000"
  |                        up_thread="true" down_thread="true" />
  |         <FRAG frag_size="8192"
  |               down_thread="true" up_thread="true" />
  |         <pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
  |                     shun="true" print_local_addr="true" />
  |         <pbcast.STATE_TRANSFER up_thread="true" down_thread="true" />
  |       </Config>
  |     </attribute>
  | 
  |   </mbean>


Cheers,


Sacha


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