Since I could not find a simple example demonstrating Seam-MDB (Mesage Driven Bean) usage, I am posting one for the benefit of others. We will create a simple EJB3 MDB called "Phone" and send a message to it from a EJB3 stateless bean (I assume you know how to create and use stateless beans).

In 3 steps:

Step 1: Here is the code for the MDP (Phone.java):
-----------------------------------------------------
package com.mkl.message;

import javax.jms.*;
import javax.ejb.MessageDriven;
import javax.ejb.ActivationConfigProperty;

@MessageDriven(name="PhoneMessageBean", activationConfig = {
         @ActivationConfigProperty(propertyName="destinationType", propertyValue="javax.jms.Queue"),
         @ActivationConfigProperty(propertyName="destination", propertyValue="queue/phoneQueue")
     })
public class Phone implements MessageListener {

     @Override
     public void onMessage(Message msg) {
          // TODO Auto-generated method stub
          TextMessage textMsg = (TextMessage) msg;
          try {
               System.out.println("Received Phone Call:" + textMsg.getText());
          } catch (JMSException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          }
     }
}     
     


-----------------------------------------------------

Step 2: Here is the component addition to components.xml

-----------------------------------------------------
<component name="phoneQueueSender"
          class="org.jboss.seam.jms.ManagedQueueSender">
    <property name="queueJndiName">queue/phoneQueue</property>
</component>

-----------------------------------------------------

Step 3: Here is the stateless bean function which sends a message
(YOU NEED TO IMPORT javax.jms.*)
-----------------------------------------------------
     @In(create=true)
     private transient QueueSender phoneQueueSender;  
     @In(create=true)
     private transient QueueSession queueSession;

     public void make_a_call (){
           try
           {
              phoneQueueSender.send( queueSession.createTextMessage("You are in trouble"));
           }
           catch (Exception ex)
           {
               ex.printStackTrace();
              throw new RuntimeException(ex);
           }
          
     }

-----------------------------------------------------