EJB3.0 - JBoss - How to send JMS message to an MDB

[Andor Nemeth]

Hi all,

I have an MDB. It has been successfuly deployed in JBoss:

    
package org.andor.messagedriven;
 
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
 
@MessageDriven(activationConfig={
        @ActivationConfigProperty(
             propertyName="destinationType",
             propertyValue="javax.jms.Queue"),
        @ActivationConfigProperty(
             propertyName="destination",
             propertyValue="queue/myQueue"),
        @ActivationConfigProperty(
             propertyName="acknowledgeMode",
             propertyValue="Auto-acknowledge")})
 
public class MessageProcessor implements MessageListener {
 
public void onMessage(Message msg) {
System.out.println(this.getClass().getName() + " called...");
try {
System.out.println(msg.getStringProperty("myStrVar"));
} catch (JMSException e) {
e.printStackTrace();
}
 
}
 
}

I have trouble writting a client.
How can I locate the JMS destination and send messages to it from a regular java client application?!
[ July 22, 2007: Message edited by: Andor Nemeth ]

[Andor Nemeth]

I've solved this problem.
So, if you're using JBoss you have to get jbossall-client.jar into your CLASSPATH! (Be careful to import the right one, there's also a jboss-client.jar!)

Here's the client code I've used to send a message to the JMS queue destination:

    
package org.andor.messagedriven.client;
 
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.naming.InitialContext;
import javax.naming.NamingException;
 
public class TestMessageProducer {
 
public static void main(String[] args) {

try {
InitialContext init = new InitialContext();

//get reference to JMS destination
javax.jms.Queue destination =
                (javax.jms.Queue) init.lookup("queue/myQueue");

//get reference to the ConnectionFactory
ConnectionFactory connectionFactory =
                (ConnectionFactory) init.lookup("QueueConnectionFactory");

            Connection connection = connectionFactory.createConnection();
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            
            Message myMessage = session.createTextMessage();
            myMessage.setStringProperty("myStrVar", "myStrVar's Value");
            
            MessageProducer producer = session.createProducer(destination);
            producer.send(myMessage);
            System.out.println("Message sent!");

} catch (NamingException e) {
// TODO Auto-generated catch block
} catch (JMSException e) {
e.printStackTrace();
}
}
}

[ July 22, 2007: Message edited by: Andor Nemeth ]

[James Frankman]

Andor,

Thanks for the example. I am new at MDBs so forgive my ignorance. If the client is on a remote host, how does the client know where the server is? Is this done in the initialcontext. Is there some setting file you need to setup?

[Andor Nemeth]

Originally posted by James Frankman:

If the client is on a remote host, how does the client know where the server is? Is this done in the initialcontext. Is there some setting file you need to setup?

Hi James!

Yes, it's done in the InitialContext. If you look at the InitialContext, it can take a Properties object with information about your remote server as an argument. These settings aren't the same for every app. server, so you should consult your container vendor's manual.

Actually you're locating a remote JNDI service this way.

Here's an example client code for JBoss:

Properties p = new Properties();
p.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
p.put(Context.URL_PKG_PREFIXES, " org.jboss.naming: org.jnp.interfaces");
p.put(Context.PROVIDER_URL, "jnp://YOUR_SERVER_IP_COMES_HERE:1099");
 
Context jndiContext = new javax.naming.InitialContext(p);
Object ref = jndiContext.lookup("YourSuperbEJB/remote");
YourSuperbEJB dao = (YourSuperbEJB) PortableRemoteObject.narrow(ref,YourSuperbEJB.class);

I've omitted exception handling in this example. "YOUR_SERVER_IP_COMES_HERE" could be also: localhost!

Andor
[ August 08, 2007: Message edited by: Andor Nemeth ]

[michael yue]

Hi,
Just a simple question. How do you define the lookup string below?
jndiContext.lookup("YourSuperbEJB/remote");
Is the default structure like YourSuperbEJB/remote ?
What if I have different application ear with similar ejb names?

Thanks

[Bennet Xavier]

What a wonderful code it is, it worked nicely. thank you very much for superb example.

I might be little late in thanking, please don't mind.

Thanks,
Bennet Xavier.

[ankit kumar]

michael yue wrote:Hi,
Just a simple question. How do you define the lookup string below?
jndiContext.lookup("YourSuperbEJB/remote");
Is the default structure like YourSuperbEJB/remote ?
What if I have different application ear with similar ejb names?

Thanks

YourSuperbEJB is your @Stateless(name = "YourSuperbEJB ") which you write in your bean implementing class. And remote is that you are calling it on the remote , if you are on local you can write "YourSuperbEJB/local" ..

please correct me if I am wrong ..