Simple chat client using JMS - swing

Question

I'm using Swing, Java Messaging Service and GlassFish4.1 server to build a chat box from a Jpanel so I can add it to my Jframe application; but I seem to have a problem establishing a connection.
During runtime the program stops at the line:
TopicConnectionFactory tcf = (TopicConnectionFactory) ctx.lookup("BJconn");
I previously got this client-code to work on an Enterprise application, but now I'm attempting to add it to a regular Java project I'm rather stuck.
Really appreciate any help on this, I'm very new to JMS so please keep answers as Lamen as possible. Thanks!
import java.awt.event.KeyEvent;
import javax.jms.*;
import javax.naming.*;
import javax.swing.*;
import javax.swing.text.DefaultCaret;
public class ChatPanel extends javax.swing.JPanel implements Runnable{
private Thread t = null;
private TopicConnection tpConnection = null;
private TopicPublisher tpPublisher = null;
private TopicSession tpSession = null;
private TopicSubscriber tpSubscriber = null;
private final String name;
/**
* Creates new form chatFrame
* #param nickName
*/
public ChatPanel(String nickName)
{
initComponents();
DefaultCaret caret = (DefaultCaret) gameInfoTextArea.getCaret();
caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
name = nickName;
connect();
}
/**
* This method is called from within the constructor to initialise the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
// </editor-fold>
public JTextArea getTextArea()
{
return gameInfoTextArea;
}
public void setText(String textString)
{
String s = gameInfoTextArea.getText() + "\n" + textString;
gameInfoTextArea.setText(s);
}
private void connect()
{
try
{
Context ctx = new InitialContext();
TopicConnectionFactory tcf = (TopicConnectionFactory)
ctx.lookup("BJconn");
tpConnection = tcf.createTopicConnection();
tpConnection.setClientID(name);
tpSession = tpConnection.createTopicSession(false,
TopicSession.AUTO_ACKNOWLEDGE);
Topic topic = (Topic) ctx.lookup("BJDest");
tpPublisher = tpSession.createPublisher(topic);
tpSubscriber = tpSession.createDurableSubscriber(topic, name);
tpConnection.start();
t = new Thread(this);
t.start();
}
catch (Exception e)
{
JOptionPane.showMessageDialog(null, "Chat cannot connect");
System.out.println(e.getMessage());
}
}
/*private void closeButtonActionPerformed(java.awt.event.ActionEvent evt) {
try
{
tpConnection.close();
}
catch (Exception e)
{
JOptionPane.showMessageDialog(null, e.getMessage() );
}
} */
private void sendMessage()
{
try
{
TextMessage tx = tpSession.createTextMessage();
tx.setText(name + ": " + this.chatField.getText());
tpPublisher.send(tx);
this.chatField.setText("");
}
catch (Exception e)
{
JOptionPane.showMessageDialog(null, "Cannot send message");
}
}
#Override
public void run()
{
try
{
while (true)
{
TextMessage tx = (TextMessage) tpSubscriber.receive();
if (tx != null)
{
String content = "";
content += this.gameInfoTextArea.getText() + "\n" + tx.getText();
this.gameInfoTextArea.setText(content);
Thread.sleep(100);
}
}
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
}
/**
* This method is called from within the constructor to initialise the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
chatField = new javax.swing.JTextField();
jScrollPane1 = new javax.swing.JScrollPane();
gameInfoTextArea = new javax.swing.JTextArea();
setBackground(new java.awt.Color(0, 102, 0));
chatField.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
chatFieldActionPerformed(evt);
}
});
chatField.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
chatFieldKeyReleased(evt);
}
});
gameInfoTextArea.setEditable(false);
gameInfoTextArea.setColumns(20);
gameInfoTextArea.setRows(5);
jScrollPane1.setViewportView(gameInfoTextArea);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(chatField)
.addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 358, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 107, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(chatField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
);
}// </editor-fold>
private void chatFieldActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void chatFieldKeyReleased(java.awt.event.KeyEvent evt) {
if (evt.getKeyCode() == KeyEvent.VK_ENTER)
{
sendMessage();
}
}
// Variables declaration - do not modify
private javax.swing.JTextField chatField;
private javax.swing.JTextArea gameInfoTextArea;
private javax.swing.JScrollPane jScrollPane1;
// End of variables declaration
}