Single Threaded MDB on Glassfish

Question

I have a number of MDBs running on Glassfish 3.1.2.2. Due to the nature of work on one of the MDBs I need to make it single threaded. I looked at the Tuning Guide, and while

Answer 1

That's easy to achieve via the glassfish-ejb-jar.xml deployment descriptor:

<glassfish-ejb-jar>
  <enterprise-beans>
    <ejb>
      <ejb-name>YourMDB</ejb-name>
      <bean-pool>
        <resize-quantity>1</resize-quantity>
        <max-pool-size>1</max-pool-size>
        <steady-pool-size>1</steady-pool-size>
      </bean-pool>
    </ejb>
  </enterprise-beans>
</glassfish-ejb-jar>

The above section will limit the number of processing beans to strictly 1, regardless of what the global poolsize says. That way you can easily finetune the system setup.