I build a conf JBoss 4.1 community platform with :

- 1 cluster of two nodes JMS JBoss AS  with Messaging with clustered queues

- 1 mysql 5.0 persistence unit for permanent JMS messages in master/master config

- 1 cluster of two nodes EJB session stateless for business logic

- 1 jms client to deliver messages for the JMS cluster.

What does it happen ?

when I send messages in 20 threads of 30 msg in the clustered queues :

ALL is al right : each message is managed by 1  node MDB  of the JMS cluster, each MDB onDemand method activates  a EJB business function in the EJB cluster.

But after the test, there are SOME messages that stay in the mysql RDBMS :

JBM_MSG_REF 0 message

JBM_MSG 6 messages are in the persistence table.

for 600 msg sent.

Is there any one that have any idea of what does it happend  ? Is is a bug or how to solve this pb ?

The pb doesn't happend with 5 threads for 2 messages !!!

Best regards.