This can be achieved by increasing the pool size for the Message Driven Bean.
To do so you have to edit your jboss.xml and have the pool size mentioned in the container configurations, this piece of code will increase the poolsize for a particular MDB [having configuration name as "BeanName-Config"], you can have it for all the MDB's by editing the jboss.xml :
SCJP 5 , SCBCD [Prep Started ] , WLS 8.1 Server Admin
Joined: Aug 18, 2009
When the pool size from jms-ds.xml used right now in my case it is configured to 20. if I dont define conatainer-configuration in jboss.xml is it uses from jms-ds.xml. What is the default connection pool size for MDB.