How Do I Create Singleton Message Driven Bean?

In JBoss 3.2.4, you can use the Singleton Message Driven Bean EJBConfiguration. 

To set the configuration, locate the message-driven element for your MDB in your jboss.xml file and set the configuration-name as shown below:

<message-driven>
    <ejb-name>YourBean</ejb-name>
    <configuration-name>Singleton Message Driven Bean</configuration-name>
    <!-- ...  -->
</message-driven>

Before 3.2.4 you will have to add this configuration yourself. Example