Fiz minha aplicação usando J2SE 5.0 (1.5.0_4) [RESOLVIDO]

/*
 * Created on 12/07/2005 23:50:06
 * @author Jair Priori Minharo Júnior / Administrador
 */

package servidor.telasInternas;

import java.awt.AWTEvent;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.io.IOException;
import java.net.InetAddress;
import java.net.URL;
import java.net.UnknownHostException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JEditorPane;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTree;
import javax.swing.event.InternalFrameEvent;
import javax.swing.event.InternalFrameListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeSelectionModel;


public class MonitorDaRede extends JInternalFrame implements TreeSelectionListener, InternalFrameListener{
    static final int xOffset = 50, yOffset= 30;
    private static Container contentor;
    private static JLabel jlMonitor = new JLabel("Java Universal Systems Management Server - jUSMS", JLabel.CENTER);
    
    //VARIAVEIS
    private static JPanel networkPanel;
    private JEditorPane htmlPane;
    public static JTree tree;
    private URL indexURL;
    private String str_indexURL;
    private static boolean DEBUG = false;
    
    private static boolean playWithLineStyle = false;
    private static String lineStyle = "Horizontal";

    private static boolean useSystemLookAndFeel = false;
    
    private static String nomHost;
    
    public static DefaultMutableTreeNode comp;
    public static DefaultMutableTreeNode top;
    
    //PopUP Menu
    public static JPopupMenu popupmenu;
    public static JMenuItem jpopMI;
    
    public MonitorDaRede(){
        super("Monitor da Rede",
                false,
                false,
                false,
                true);
        setSize(600,500);
        setLocation(xOffset, yOffset);
        addInternalFrameListener(this);
        
        PopupMenu();
        NetworkView();
        ServerName();
        
        contentor = getContentPane();
        contentor.setLayout(new BorderLayout());
        //J2SE 1.4.0_x
        contentor.add(NetworkView());
        //J2SE 1.5.0_x
//        add(NetworkView());
        contentor.add(jlMonitor, BorderLayout.PAGE_END);
        jlMonitor.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
    }
    
    public Component NetworkView(){
        networkPanel = new JPanel(new GridLayout(1,0));
        
        top = new DefaultMutableTreeNode("Servidor: " + nomHost);
        criaNodes(top);
        
        tree = new JTree(top);
        tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
        
        tree.addTreeSelectionListener(this);
        
        if (playWithLineStyle){
            System.out.println("line style = " + lineStyle);
            tree.putClientProperty("JTree.lineStyle", lineStyle);
        }
        
        ImageIcon leafIcon = createImageIcon("img/win_logo.png");
        ImageIcon server = createImageIcon("img/network.png");
        if (leafIcon != null) {
            DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
            renderer.setLeafIcon(leafIcon);
            renderer.setClosedIcon(server);
            renderer.setOpenIcon(server);
            tree.setCellRenderer(renderer);
        } else {
            System.err.println("Leaf icon missing; using default.");
        }
        
        JScrollPane treeView = new JScrollPane(tree);
        
        htmlPane = new JEditorPane();
        htmlPane.setEditable(false);
        initHelp();
        JScrollPane htmlView = new JScrollPane(htmlPane);
        
        JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
        splitPane.setLeftComponent(treeView);
        splitPane.setRightComponent(htmlView);
        splitPane.setEnabled(false);
        
        Dimension minimumSize = new Dimension(150,350);
        htmlView.setMinimumSize(minimumSize);
        treeView.setMinimumSize(minimumSize);
        splitPane.setDividerLocation(150);
        
        splitPane.setPreferredSize(new Dimension(500,600));
        
        return networkPanel.add(splitPane);
    }

    public void criaNodes(DefaultMutableTreeNode top) {
        comp = null;
        
        String dbURL = "jdbc:mysql://localhost/jusms";
        Connection c = null;
        ResultSet r = null;

        try
        {
           Class.forName("com.mysql.jdbc.Driver").newInstance();
           c = DriverManager.getConnection(dbURL, "root", "senha");
           Statement s = c.createStatement();
           r = s.executeQuery("SELECT * FROM rede ORDER BY pc_name");
           while (r.next()){
               comp = new DefaultMutableTreeNode(new CompInfo(r.getString("pc_name"),r.getString("pc_name")+".html"));               
               top.add(comp);
           }
        } catch (InstantiationException e)
        {
           e.printStackTrace();
        } catch (IllegalAccessException e)
        {
           e.printStackTrace();
        } catch (ClassNotFoundException e)
        {
           e.printStackTrace();
        } catch (SQLException e)
        {
           e.printStackTrace();
        } finally
        {
           try
           {
              r.close();
              c.close();
           } catch (SQLException e1)
           {
              e1.printStackTrace();
           }
        }
        
//        comp = new DefaultMutableTreeNode(new CompInfo("JUNIOR","JUNIOR.html"));
//        top.add(comp);
    }

    public void valueChanged(TreeSelectionEvent arg0) {
        DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
        
        if (node == null) return;
        
        Object nodeInfo = node.getUserObject();
        if (node.isLeaf()) {
            CompInfo pc = (CompInfo)nodeInfo;
            displayURL(pc.pcURL);
            if (DEBUG){
                System.out.println(pc.pcURL + ": \n   ");
            }
        }else {
            displayURL(str_indexURL);
        }
        if (DEBUG) {
            System.out.println(nodeInfo.toString());
        }
    }
    
    private class CompInfo{
        public String compName;
//        public URL compURL;
        public String pcURL;
        
        public CompInfo(String comp, String filename) {
            compName = comp;
            pcURL = "file:///C:/jusms/" + filename;
            if (pcURL == null) {
                System.err.println("Não foi possivel encontrar o arquivo: " + filename);
            }
/*            compName = comp;
            compURL = MonitorDaRede.class.getResource(filename);
            if (compURL == null) {
                System.err.println("Não foi possivel encontrar o arquivo: " + filename);
            }*/
        }
        
        public String toString() {
            return compName;
        }
    }
    
    private void initHelp() {
        
        String s = "NetworkIndex.html";
        str_indexURL = "file:///C:/jusms/" + s;
        if (str_indexURL == null) {
            System.err.println("Não foi possivel encontrar o arquivo: " + s);
        } else if (DEBUG) {
            System.out.println("Página inicial é " + str_indexURL);
        }
        
        displayURL(str_indexURL);
        
/*        String s = "NetworkIndex.html";
        indexURL = MonitorDaRede.class.getResource(s);
        if (indexURL == null) {
            System.err.println("Não foi possivel encontrar o arquivo: " + s);
        } else if (DEBUG) {
            System.out.println("Página inicial é " + indexURL);
        }
        
        displayURL(indexURL);*/
    }
    
//    private void displayURL(URL url){
    private void displayURL(String url){
        try {
            if (url != null) {
                htmlPane.setPage(url);
            } else {
                htmlPane.setText("Página não encontrada");
            }
            if (DEBUG) {
                System.out.println("Tentou exibir uma página que nao existe.");
            }
        } catch (IOException e) {
            System.err.println("Tentou ler uma página com erros: " + url);
            System.out.println(e);
        }
/*        try {
            if (url != null) {
                htmlPane.setPage(url);
            } else {
                htmlPane.setText("Página não encontrada");
            }
            if (DEBUG) {
                System.out.println("Tentou exibir uma página que nao existe.");
            }
        } catch (IOException e) {
            System.err.println("Tentou ler uma página com erros: " + url);
        }*/
    }
    
    public void internalFrameOpened(InternalFrameEvent arg0) {
        InfoSistema.jtaInformacao.setText(InfoSistema.jtaInformacao.getText() + "\n\n" + 
                "\t---------------------------------------------\n"+
                "\t" + "Monitor da Rede 100% Carregado\n" +
                "\t---------------------------------------------");
    }

    public void internalFrameClosing(InternalFrameEvent arg0) {        
    }

    public void internalFrameClosed(InternalFrameEvent arg0) {        
    }

    public void internalFrameIconified(InternalFrameEvent arg0) {        
    }

    public void internalFrameDeiconified(InternalFrameEvent arg0) {
    }

    public void internalFrameActivated(InternalFrameEvent arg0) {        
    }

    public void internalFrameDeactivated(InternalFrameEvent arg0) {        
    }
    
    public Component PopupMenu(){
        popupmenu = new JPopupMenu("Monitor da Rede");
        jpopMI = new JMenuItem("Atualizar");
        jpopMI.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent evt){
              top.removeAllChildren();
              criaNodes(top);
              tree.updateUI();
            }    
        });
        
        popupmenu.add(jpopMI);
        
        MonitorDaRede.contentor.add(popupmenu);
        enableEvents(AWTEvent.MOUSE_EVENT_MASK);
        return popupmenu;
    }
    
    public void processMouseEvent(MouseEvent e) {
        
        if (e.isPopupTrigger()) { 
            popupmenu.show(e.getComponent(), e.getX(), e.getY());
        }
        super.processMouseEvent(e);
    }
    
    protected static ImageIcon createImageIcon(String path) {
        URL imgURL = MonitorDaRede.class.getResource(path);
        if (imgURL != null) {
            return new ImageIcon(imgURL);
        } else {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }
    
    public static String ServerName(){
        try {
            InetAddress myAddress = InetAddress.getLocalHost();
            nomHost = myAddress.getHostName();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        return nomHost;
    }
}

public Component PopupMenu(){
        popupmenu = new JPopupMenu("Monitor da Rede");
        jpopMI = new JMenuItem("Atualizar");
        jpopMI.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent evt){
              top.removeAllChildren();
              criaNodes(top);
              tree.updateUI();
            }    
        });
        
        popupmenu.add(jpopMI);
        
        add(popupmenu); <------------AQUI
        enableEvents(AWTEvent.MOUSE_EVENT_MASK);
        return popupmenu;
    }