public class MyBean implements MessageListener {

    /**
     * Injection target
     */
    String workflowAction = null;

....
}

<message-driven>
      <ejb-name>MyMDB1</ejb-name>
      <mapped-name>jms/queue1</mapped-name>
      <ejb-class>foobar.MyBean</ejb-class>
      <transaction-type>Container</transaction-type>
      <env-entry>
        <env-entry-name>workflowAction</env-entry-name>
        <env-entry-type>java.lang.String</env-entry-type>
        <env-entry-value>persist</env-entry-value>
        <injection-target>
          <injection-target-class>foobar.MyBean</injection-target-class>
          <injection-target-name>workflowAction</injection-target-name>
        </injection-target>
      </env-entry>
     </message-driven>

   <message-driven>
      <ejb-name>MyMDB2</ejb-name>
      <mapped-name>jms/queue2</mapped-name>
      <ejb-class>foobar.MyBean</ejb-class>
      <transaction-type>Container</transaction-type>
      <env-entry>
        <env-entry-name>workflowAction</env-entry-name>
        <env-entry-type>java.lang.String</env-entry-type>
        <env-entry-value>clear</env-entry-value>
        <injection-target>
          <injection-target-class>foobar.MyBean</injection-target-class>
          <injection-target-name>workflowAction</injection-target-name>
        </injection-target>
      </env-entry>
     </message-driven>