You can define the number of threads dedicated to an MDB listener.
Defining the number of listener threads
In the user configuration script for the EJB-JAR in which the MDB is defined, set the value of the threadCount property; for example:
<setProperties component="ejb.components.cmstests.MyTopicListener"> <messageListener threadCount="1" /> </setProperties>
To
enable EAServer to create multiple instances of the MDB, set the threadCount property
to a value greater than 1.