i'm new with JMS and i wrote the folloing example

import java.io.*;

  import javax.jms.*;

import javax.naming.Context;

import javax.naming.InitialContext;

public class Qsender

{

public static void main(String[] args) {

          new Qsender().send();

}

public void send() {

          BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

try {

//Prompt for JNDI names

          System.out.println("Enter QueueConnectionFactory name:");

          String factoryName = reader.readLine();

          System.out.println("Enter Queue name:");

          String queueName = reader.readLine();

          //Look up administered objects

          InitialContext initContext = new InitialContext();

          QueueConnectionFactory factory =(QueueConnectionFactory) initContext.lookup(factoryName);

          Queue queue = (Queue) initContext.lookup(queueName);

          initContext.close();

           //Create JMS objects

          QueueConnection connection = factory.createQueueConnection();

          QueueSession session =           connection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);

          QueueSender sender = session.createSender(queue);

//Send messages

          String messageText = null;

while (true) {

          System.out.println("Enter message to send or 'quit':");

          messageText = reader.readLine();

          if ("quit".equals(messageText))

          break;

          TextMessage message = session.createTextMessage(messageText);

          sender.send(message);

}

//Exit

System.out.println("Exiting...");

          reader.close();

          connection.close();

          System.out.println("Goodbye!");

} catch (Exception e) {

          e.printStackTrace();

          System.exit(1);

}

}

}

i have Jboss v5 App server but at execut the code i recived this error

javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial

          at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)

          at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)

          at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)

          at javax.naming.InitialContext.lookup(Unknown Source)

          at Qsender.send(Qsender.java:32)

          at Qsender.main(Qsender.java:13)

Some one can help me

thx