You can track the performance of message-driven EJBs in your application by monitoring the following statistics:

Statistic	Description
Idle Beans Count	The number of idle beans in this EJB
Beans In Use Count	The number of beans currently in use
Waiter Total Count	The number of EJBs currently waiting
Timeout Total Count	The total number of timed out transactions
JMS Connection Alive	The state of the EJBs JMS connection.