无状态的session bean，注意标注@Clustered是必须的，如果不进行标注那么这个session bean将不会被集群。同样有状态的session bean的集群声明也是这样的
java.lang.IllegalArgumentException: Cannot start post office since there is already a post office in the cluster with the same node id (0). Are you sure you have given each node a unique node id during installation?
If you want to change the ServerPeerID, edit :
server/<configuration (all/default/production)>/deploy/jboss-messaging.sar/messaging-service.xml
and change ServerPeerID from 0 to something unique.
The other suggestion I'd make is that you track down the other SOA platform installation. The IP address of that cluster node should be in your server.log close to the "number of cluster members" statement.
http://topic.csdn.net/u/20090616/20/2f9e5faf-b99b-446b-94b5-41e18be05892.html
http://blog.knowsky.com/187125.htm
http://blog.csdn.net/woohooli/article/details/4078748