Updating a JList

Question

I can seem to load data into my JList that i create. using the code with no pane make the JList update but when i use it with JPane it won't update. Any ideas?
Here the source code with most of unneeded stuff taken out
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.*;
import javax.swing.filechooser.FileFilter;
import java.util.*;
import java.io.*;
public class JavaTest extends JPanel implements ActionListener {
    private LoadLog loadLogs = new LoadLog();
    private JList barcodeList;
    private  DefaultListModel barcodeModel;
    private JLabel barcodeLabel;
    private JFileChooser LogChoser;
    public JavaTest() {
        super(new BorderLayout(5, 5));
        barcodeLabel = new JLabel("Read Barcodes");
        barcodeModel = new DefaultListModel();
        barcodeList = new JList(barcodeModel);
        barcodeList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        JScrollPane barcodeScrollPane = new JScrollPane(barcodeList);
        JPanel listPane = new JPanel(new BorderLayout());
        listPane.add(barcodeLabel, BorderLayout.NORTH);
        listPane.add(barcodeList, BorderLayout.CENTER);
        JPanel list_desPane = new JPanel(new BorderLayout(5,5));
        list_desPane.add(listPane, BorderLayout.WEST);
        add(list_desPane, BorderLayout.EAST);
    public JMenuBar createMenuBar() {
        JMenuBar menuBar;
        JMenu menu;
        JMenuItem menuItem;
        menuBar = new JMenuBar();
        menu = new JMenu("File");
        menu.getAccessibleContext().setAccessibleDescription(
                "Menu to load log file");
        menuBar.add(menu);
        menuItem = new JMenuItem("Load Log File", KeyEvent.VK_O);
        menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, ActionEvent.CTRL_MASK));
        menuItem.addActionListener(this);
        menuItem.setActionCommand("load");
        menu.add(menuItem);
        menuItem = new JMenuItem("Exit",KeyEvent.VK_X);
        menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, ActionEvent.ALT_MASK));
        menuItem.addActionListener(this);
        menuItem.setActionCommand("exit");
        menu.add(menuItem);
        return menuBar;
    private static void createAndShowGUI() {
        JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame frame = new JFrame("Field report producer");
        JavaTest menuBar = new JavaTest();
        frame.setJMenuBar(menuBar.createMenuBar());
        frame.setDefaultCloseOperation( JFrame.DO_NOTHING_ON_CLOSE);
        JComponent newContentPane = new JavaTest();
        newContentPane.setOpaque(true);
        frame.setContentPane(newContentPane);
        frame.addWindowListener(new WindowAdapter(){
           public void windowClosing(WindowEvent e){
              int exit = JOptionPane.showConfirmDialog(null, "Do you want to exit?",
                                                             "Quite Program?",
                                                             JOptionPane.YES_NO_OPTION);
              if (exit == JOptionPane.YES_OPTION)
              System.exit(0);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    public void actionPerformed(ActionEvent e) {
       //Handle open button action.
        if ("exit".equals(e.getActionCommand()))
          exit();
        else if("load".equals(e.getActionCommand())){
           LogChoser = new JFileChooser(CurrentDirectory());
           LogChoser.setFileFilter(new FileFilter() {
              public boolean accept(File f) {
                 return f.getName().toLowerCase().endsWith(".txt")
                        || f.isDirectory();
              public String getDescription() {
                 return "Log files (*.txt)";
           int returnVal = LogChoser.showOpenDialog(JavaTest.this);
            if (returnVal == JFileChooser.APPROVE_OPTION) {
               File file = LogChoser.getSelectedFile();
               ArrayList BarcodeLog = new ArrayList();
               BarcodeLog = loadLogs.LoadLogFile(file.getAbsolutePath());
               for (Iterator it = BarcodeLog.iterator(); it.hasNext(); ){
                  barcodeModel.addElement(it.next());
    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
    private void exit()
     int exit = JOptionPane.showConfirmDialog(null, "Do you want to exit?",
                                                       "Quite Program?",
                                                       JOptionPane.YES_NO_OPTION);
          if (exit == JOptionPane.YES_OPTION)
             System.exit(0);
    private String CurrentDirectory(){
       String directory = "";
       File dir1 = new File (".");
       try {
        directory = dir1.getCanonicalPath();
     catch(Exception e) {
       e.printStackTrace();
       return directory;
import java.io.*;
import java.util.ArrayList;
import javax.swing.*;
public class LoadLog
  private ArrayList BarcodeLog;
  public LoadLog()
  public ArrayList LoadLogFile(String FileName)
    BarcodeLog = new ArrayList();
    try
      FileInputStream fstream = new FileInputStream(FileName);
      DataInputStream in = new DataInputStream(fstream);
      while (in.available() != 0) {
        BarcodeLog.add(in.readLine());
      in.close();
    catch (FileNotFoundException e)
       JOptionPane.showMessageDialog(null, "File not found.", "Error", JOptionPane.ERROR_MESSAGE);
    catch (IOException e)
       JOptionPane.showMessageDialog(null, "Error Loading File.", "Error", JOptionPane.ERROR_MESSAGE);
   return BarcodeLog;
}

Answer 1

- if you're goin to add a pane then change this:
  listPane.add(barcodeList, BorderLayout.CENTER);into this:
// JScrollPane must be added here instead of a JList
       listPane.add(barcodeScrollPane, BorderLayout.CENTER);