If you try to run HAJMS with a different shared database installed only on one 
member of cluster, you will have a round robin load balancing


Some words from: http://www.jboss.org/wiki/Wiki.jsp?page=JBossMQHA

anonymous wrote : 
  | Load-balancing message processing with MDBs is a one of the best ways to 
distribute load across a cluster because the node with the least activity will 
process the message (as opposed to a round-robin load-balancing algorithm which 
could continue to place load on an already overloaded node).
  | 
  | To run HAJMS with a different shared database, you will need to replace the 
hsqldb-jdbc2-service.xml file with one tuned to the specific database. For 
example if you use MySQL the file is mysql-jdbc2-service.xml. Configuration 
files for a number of RDBMS are bundled with the JBoss distribution. They can 
be found under docs/examples/jms.
  | 

I resolved all HAJMS problem with this documents in my cluster.



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