The thing is that they are NOT being called from different implementations.  
It is the exact same code except they are configured differently.  Multiple 
MDBs are deployed as such in the xml

<ejb-jar>
  <enterprise-beans>
    <message-driven>
      <ejb-name>MDBA</ejb-name>
      <ejb-class>main.MDB</ejb-class>
      <transaction-type>Container</transaction-type>
      <acknowledge-mode>Auto-acknowledge</acknowledge-mode>
      <message-driven-destination>
        <destination-type>javax.jms.Queue</destination-type>
      </message-driven-destination>
      <env-entry>
        <env-entry-name>config</env-entry-name>
        <env-entry-type>java.lang.String</env-entry-type>
        <env-entry-value>A</env-entry-value>
      </env-entry>
    </message-driven>
    <message-driven>
      <ejb-name>MDBB</ejb-name>
      <ejb-class>main.MDB</ejb-class>
      <transaction-type>Container</transaction-type>
      <acknowledge-mode>Auto-acknowledge</acknowledge-mode>
      <message-driven-destination>
        <destination-type>javax.jms.Queue</destination-type>
      </message-driven-destination>
      <env-entry>
        <env-entry-name>config</env-entry-name>
        <env-entry-type>java.lang.String</env-entry-type>
        <env-entry-value>B</env-entry-value>
      </env-entry>
    </message-driven>
  </enterprise-beans>

   <message-driven>
                  <ejb-name>MDBA</ejb-name>
                     destination-jndi-name>queue/A</destination-jndi-name>
   </message-driven>
   <message-driven>
                  <ejb-name>MDBB</ejb-name>
          <destination-jndi-name>queue/B</destination-jndi-name>
   </message-driven>

The difference here is that the injected "config" property is used to lookup 
its respective configuration.  

Thanks for the help again.  I have posted the original post on the EJB3 forum.



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