Seam : How to display messages from MessageDrivenBean in view ?

[Dumb Joe]

Hi,

in order to get to know Seam and especially JMS I wanted to write a little chat-web-app where 2 chatters can communicate with each other. (I am a blooy beginner in J2EE in general).

Therefore 2 MDBs shall pull and put the messages in 2 different queues.

For the example I have only 1 sender, 1 queue, 1 receiver, 1 receiverInbox, 1 view.

Until now I handled it as following (I assume, that it could be the wrong approach, but I wanted to know whether it works this way) :

My code :

sender :

    

package org.domain.chat.session; 

import javax.jms.QueueSender; 
import javax.jms.QueueSession; 

import org.jboss.seam.annotations.In; 
import org.jboss.seam.annotations.Name; 
import org.jboss.seam.annotations.Scope; 
import org.jboss.seam.ScopeType; 

@Name("chatterone") 
@Scope(ScopeType.CONVERSATION) 
public class ChatterOne { 
@In 
private QueueSender aQueueSender; 
@In(create = true) 
private QueueSession queueSession; 

public void sendMessage() { 
  try { 
    aQueueSender.send(queueSession.createTextMessage("Test!")); 
  } catch (Exception e) { 
    System.out.println("aaaaaarrrggghhhh"); 
  } 
   
} 

} 

receiver :

   

package org.domain.chat.session; 

import javax.ejb.MessageDriven; 
import javax.jms.JMSException; 
import javax.jms.Message; 
import javax.jms.MessageListener; 
import javax.jms.TextMessage; 
import javax.ejb.ActivationConfigProperty; 

import org.jboss.seam.annotations.Name; 

@Name("chattertworeceiver") 
@MessageDriven(name = "chatterTwoReceiver", activationConfig = { 
    @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"), 
    @ActivationConfigProperty(propertyName = "destination", propertyValue = "queue/chatQueue") }) 
public class ChatterTwoReceiver implements MessageListener { 
   
  ChatterTwoInbox inbox = ChatterTwoInbox.getInstance(); 
   

  public void onMessage(Message message) { 
      TextMessage textMsg = (TextMessage) message; 
      System.out.println(textMsg); 
      inbox.setValue(textMsg); 
  } 

} 

 

inbox (pseudo-singleton) --> this is the class, which shall feed the view with info (at least in my approach) :

 

package org.domain.chat.session; 

import javax.jms.TextMessage; 

import org.jboss.seam.annotations.Name; 

@Name("chattertwoinbox") 
public class ChatterTwoInbox { 
     
    private static ChatterTwoInbox instance = null; 
    public TextMessage value; 

    public ChatterTwoInbox() {} 
  
    public static ChatterTwoInbox getInstance() { 
        if (instance == null) { 
            instance = new ChatterTwoInbox(); 
        } 
        return instance; 
    } 
     
    public void setValue(TextMessage string) { 
        value=string; 
    } 
     
    public TextMessage getValue(){ 
        return value; 
    } 
} 

view :

<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:s="http://jboss.com/products/seam/taglib"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:rich="http://richfaces.org/rich"
    xmlns:a4j="http://richfaces.org/a4j"
    template="layout/template.xhtml">

    <ui:define name="body">

        <h:form>
        <rich:panel>
            <h:panelGrid columns="2">
                <h:graphicImage value="/img/seamlogo.png" alt="Seam logo"/>
                <s:div styleClass="info">
                    <p><strong>Chat</strong></p>
                    <ul class="bullets">
                        <li><a4j:commandButton value="start chat" action="#{chatterone.sendMessage}" reRender="a"/></li>
                        <h:outputText id="a" value="#{chattertwoinbox.value}" />
                    </ul>
                </s:div>
            </h:panelGrid>
        </rich:panel>
      </h:form>
    </ui:define>
</ui:composition>


    

So far the message is returned as outputtext in the view. (does not work because of failures in view?).
Actually I wanted to display the messages in listboxes/textfields (like chat windows) but I dont know how to handle them in Seam (JSF).

So my questions are :

1.) Does anyone know how I can use listboxes to display messages ?
2.) Is it even possible to delegate the messages from a Message Driven Bean to a JSF-component -> listbox ?

Every hint is much appreciated, I am desperated right now

Kindest Regards,

Dumb_Joe