I can't interact (scroll) my scrollbars in JScrollPane on a JPanel

Question

Hi, I'm having trouble with my textarea with jscrollpane that is on an overidden JPanel to paint a background image. My first problem is that I can't even see the scrollpane but I fixed that through g.setXORMode(true). Now, my problem is even though I can see the component perfectly, when I try to scroll, it won't scroll (unclickable). Is there any way to fix this?
-I heard that I should try to add the jscrollpane to a component (like JLabel) that's always above the image. But it didn't work. I am not sure i did it right though, so I am looking for other options.
Anyways, here is the code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.plaf.*;
import javax.swing.plaf.metal.*;
import java.util.*;
public class SrtfMvtDemo extends JFrame implements ActionListener, Runnable {
     public DemoJPanel demoPanel = new DemoJPanel();
     private     JPanel     buttonPanel = new JPanel();
     private     JButton     buttonOpen = new JButton("Open"),
                         buttonStart = new JButton("Start"),
                         //buttonReset = new JButton("Reset"),
                         buttonPause = new JButton("Pause"),
                         buttonAbout = new JButton("About");
     public ImageIcon imageBg = new ImageIcon("img//logo.jpg");
     public ImageIcon imageDiagram = new ImageIcon("img//diagram.gif");
     private int[] xLocations = {550,522,494,466,438,410,382,354,326,298,272,242,
          214,186,158,130,102,74,46,18};
     private int[] xxLocations = {18,46,74,102,130,158,186,214,242,272,298,326,
          354,382,410,438,466,494,522,550};
     public static JLabel[] jqLabels = new JLabel[20];
     public static JLabel[] rqLabels = new JLabel[20];
     public static JLabel[] ioqLabels = new JLabel[20];
     private boolean isStarted = false;
     private boolean isFinished = false;
     public static final Color foreColor = Color.WHITE;
     public static boolean isPaused = false;
     public static JScrollPane scrollpane1;
     public static JScrollPane scrollpane2;
     public static JScrollPane scrollpane3;
     public static MVT memory = new MVT();
     public static CPU cpu = new CPU();
     public static IO ioDevice = new IO();
     public static JobQueue jQueue = new JobQueue();
     public static ReadyQueue rQueue = new ReadyQueue();
     public static IOQueue ioQueue = new IOQueue();
     public static Vector fQueue = new Vector(0,1);
     public static JTextArea cpuGantt = new JTextArea(3,20);
     public static JTextArea ioGantt = new JTextArea(3,20);
     public static JTextArea statistics = new JTextArea(3,30);
     public static JLabel procCpu = new JLabel();
     public static JLabel procIO = new JLabel();
     public static JPanel nonOver = new JPanel();
     public Thread mainThread = new Thread(this);
     public static int nTimer = -1;
     public SrtfMvtDemo() {
          super("INTROOS: SRTF - MVT Algorithm Demonstrator");
          setSize(800,600);
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          setLocationRelativeTo(null);
          setForeground(Color.white);
          setResizable(false);
          getContentPane().setLayout(null);
          buttonOpen.addActionListener(this);
          buttonStart.addActionListener(this);
          buttonPause.addActionListener(this);
          buttonAbout.addActionListener(this);
          buttonStart.setEnabled(false);
          buttonPause.setEnabled(false);
          demoPanel.setLayout(null);
          demoPanel.setSize(800,525);
          demoPanel.setLocation(0,0);
          buttonPanel.setSize(800,75);
          buttonPanel.setLocation(0,526);
          buttonPanel.setLayout(new FlowLayout());
          buttonPanel.add(buttonOpen);
          buttonPanel.add(buttonStart);
          buttonPanel.add(buttonPause);
          buttonPanel.add(buttonAbout);
          getContentPane().add(demoPanel);
          getContentPane().add(buttonPanel);
     private void showUI() {
          //Job Queue Labels
          for(int i=0; i<20; i++) {
               jqLabels[i] = new JLabel();
               jqLabels.setVerticalTextPosition(JLabel.CENTER);
               jqLabels[i].setHorizontalTextPosition(JLabel.CENTER);
               jqLabels[i].setForeground(Color.white);
               jqLabels[i].setSize(25,25);
               jqLabels[i].setLocation(xLocations[i],28);
               demoPanel.add(jqLabels[i]);
          //Ready Queue Labels
          for(int i=0; i<20; i++) {
               rqLabels[i] = new JLabel();
               rqLabels[i].setVerticalTextPosition(JLabel.CENTER);
               rqLabels[i].setHorizontalTextPosition(JLabel.CENTER);
               rqLabels[i].setForeground(Color.white);
               rqLabels[i].setSize(25,25);
               rqLabels[i].setLocation(xxLocations[i],97);
               demoPanel.add(rqLabels[i]);
          //IO Queue Labels
          for(int i=0; i<20; i++) {
               ioqLabels[i] = new JLabel();
               ioqLabels[i].setVerticalTextPosition(JLabel.CENTER);
               ioqLabels[i].setHorizontalTextPosition(JLabel.CENTER);
               ioqLabels[i].setForeground(Color.white);
               ioqLabels[i].setSize(25,342);
               ioqLabels[i].setLocation(xLocations[i],97);
               demoPanel.add(ioqLabels[i]);
          procCpu.setSize(100,20);
          procCpu.setLocation(450,209);
          procCpu.setForeground(Color.white);
          procCpu.setBackground(Color.black);
          demoPanel.add(procCpu);
          procIO.setSize(100,20);
          procIO.setLocation(450,374);
          procIO.setForeground(Color.white);
          procIO.setBackground(Color.black);
          demoPanel.add(procIO);
          cpuGantt.setBackground(Color.black);
          cpuGantt.setForeground(Color.white);
          cpuGantt.setEditable(false);
          cpuGantt.setLineWrap(true);
          cpuGantt.setWrapStyleWord(true);
          cpuGantt.setSize(557,47);
          cpuGantt.setLocation(15,162);
          cpuGantt.setAutoscrolls(true);
          //demoPanel.add(cpuGantt);
          scrollpane1 = new JScrollPane(cpuGantt,
               JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
               JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
          scrollpane1.setSize(557,47);
          scrollpane1.setLocation(15,162);
          //demoPanel.add(scrollpane1);
          ioGantt.setBackground(Color.black);
          ioGantt.setForeground(Color.white);
          ioGantt.setEditable(false);
          ioGantt.setLineWrap(true);
          ioGantt.setWrapStyleWord(true);
          ioGantt.setSize(557,47);
          ioGantt.setLocation(15,327);
          ioGantt.setAutoscrolls(true);
          //demoPanel.add(ioGantt);
          scrollpane2 = new JScrollPane(ioGantt,
               JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
               JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
          scrollpane2.setSize(557,47);
          scrollpane2.setLocation(15,327);
          //demoPanel.add(scrollpane2);
          statistics.setBackground(Color.black);
          statistics.setForeground(Color.white);
          statistics.setEditable(false);
          statistics.setLineWrap(true);
          statistics.setWrapStyleWord(true);
          statistics.setSize(760,100);
          statistics.setLocation(18,405);
          statistics.setAutoscrolls(true);
          //demoPanel.add(statistics);
          scrollpane3 = new JScrollPane(statistics,
               JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
               JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
          scrollpane3.setSize(760,100);
          scrollpane3.setLocation(18,405);
          //demoPanel.add(scrollpane1);
          //demoPanel.add(scrollpane2);
          //demoPanel.add(scrollpane3);
          nonOver.setLayout(null);
          nonOver.setSize(800,525);
          nonOver.setLocation(0,0);
          nonOver.setOpaque(false);
          nonOver.add(scrollpane1);
          nonOver.add(scrollpane2);
          nonOver.add(scrollpane3);
          demoPanel.add(nonOver);
     public static void main(String[] args) {
          MetalLookAndFeel.setCurrentTheme(new JetTheme());
          try {
               UIManager.setLookAndFeel(new MetalLookAndFeel());
          } catch(Exception e) {}
          setDefaultLookAndFeelDecorated(true);
          JDialog.setDefaultLookAndFeelDecorated(true);
          SrtfMvtDemo mainDemo = new SrtfMvtDemo();
          mainDemo.setVisible(true);
     public void actionPerformed(ActionEvent ae) {
          if(ae.getSource()==buttonOpen) {
               Opener open = new Opener();
               isStarted = open.doOpen();
               if(isStarted) {
                    buttonStart.setEnabled(true);
                    buttonPause.setEnabled(true);
          if(ae.getSource()==buttonStart) {
               buttonOpen.setEnabled(false);
               buttonStart.setEnabled(false);
               showUI();
               isStarted = true;
               showUI();
               mainThread.start();
          if(ae.getSource()==buttonPause) {
               isPaused = !isPaused;
          if(ae.getSource()==buttonAbout) {
               JOptionPane.showMessageDialog(null, "This machine project is made "+
                    "by:\nAndrei Victor\nJohanne Pagaduan\nOliver Recio\nINTROOS S11",
                    "About", JOptionPane.INFORMATION_MESSAGE);
     public void run() {
          do {
               while(!isPaused) {
                    if(fQueue.size() > 0 && fQueue.size() == Job.getNumberOfJobs()) {
                         isFinished = true;
                         break;
                    try {
                         mainThread.sleep(10);
                    } catch(Exception e) {
                    nTimer++;
                    System.out.println("Time: " + nTimer);
                    if(cpu.currentJob != null)
                         System.out.println("J"+cpu.currentJob.getID()+" Burst: "+cpu.currentJob.getBurst());
                    jQueue.check();
                    rQueue.check();
                    cpu.check();
                    ioQueue.check();
                    ioDevice.check();
                    repaint();
          } while(!isFinished);
          JOptionPane.showMessageDialog(null, "Simulation Finished", "Sim Info",
               JOptionPane.INFORMATION_MESSAGE);
     public class DemoJPanel extends JPanel {
          //Do your paint stuff here!
          public DemoJPanel() {
               setDoubleBuffered(true);
          public void paintComponent(Graphics g) {
               super.paintComponent(g);
               if(!isStarted) {
                    g.drawImage(imageBg.getImage(), 0, 0, this);
               } else {
                    g.drawImage(imageDiagram.getImage(), 0, 0, this);
                    g.drawString("Time: " + nTimer, 700, 370);
                    g.setXORMode(Color.black); //this lets me see through the image
                                                       //but doesn't let me interact with it.
                    for(int i=0; i<64; i++) {
                         if(memory.memory[i] != -1)
                              g.setColor(new Color(128,47,249));
                         else
                              g.setColor(new Color(0,0,0));
                         g.fill3DRect(655,28+(i*4)+i,125,4,true);
     /** JetTheme class to change the color of the L&F of the Metal theme.
public static class JetTheme extends DefaultMetalTheme {
/** Method to return the theme name.
public String getName() { return( "Jet" ); }
private final ColorUIResource primary1 =
new ColorUIResource(80,80,80);
private final ColorUIResource primary2 =
new ColorUIResource(90,90,90);
private final ColorUIResource primary3 =
new ColorUIResource(50,50,50);
private final ColorUIResource secondary1 =
new ColorUIResource(0,210,0);
private final ColorUIResource secondary2 =
new ColorUIResource(0,140,0);
private final ColorUIResource secondary3 =
new ColorUIResource(0,0,0);
private final ColorUIResource black =
new ColorUIResource(0,255,0);
private final ColorUIResource white =
new ColorUIResource(0,0,0);
          protected ColorUIResource getPrimary1() { return( primary1 ); }
          protected ColorUIResource getPrimary2() { return( primary2 ); }
          protected ColorUIResource getPrimary3() { return( primary3 ); }
          protected ColorUIResource getSecondary1() { return( secondary1 ); }
          protected ColorUIResource getSecondary2() { return( secondary2 ); }
          protected ColorUIResource getSecondary3() { return( secondary3 ); }
          protected ColorUIResource getBlack() { return( black ); }
          protected ColorUIResource getWhite() { return( white ); }

Answer 1

This is how I paint a background image:
http://forum.java.sun.com/thread.jsp?forum=57&thread=316074