debugger an eternal mystery (reload)

From: Québec (notAgain_at_enough.ca)
Date: 04/02/04 

Date: Fri, 2 Apr 2004 09:59:26 -0500

Hi again,

        Gee, I am working hard on this. And you too unfortunately.

        This is what I have when I reload the applet in appletviewer 1.4
:java.lang.NullPointerException
         How comes thirdG = offBeanSlant.getGraphics(); is not
reinitialized on reload?

Jean

------------------
C:\learnJava\Applets_divers\MixedWires>appletviewer -debug MixedWires.html
Initializing jdb ...
> run
run sun.applet.Main MixedWires.html
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable
>
VM Started: true
====================== if I stop the appplet ====================
Exception occurred: java.lang.ThreadDeath (uncaught)"thread=Thread-2",
java.lang
.Thread.sleep(), line=-1 bci=-1

Thread-2[1] cont
====================== here I restart the applet then RELOAD
IT==================
> java.lang.NullPointerException
        at MixedWires.init(MixedWires.java:103) see below
<<<<<<<<<<<<<<<<LINE 103
        at sun.applet.AppletPanel.run(AppletPanel.java:353)
        at java.lang.Thread.run(Thread.java:534)
quit

============= init ===================

public class MixedWires extends Applet
  implements Runnable {

  double angle = 0;
  static final int MAXIMAGES = 21;
  AudioClip bgsound;
  boolean DEBUG = false;
  boolean barFlag = true;
  boolean pointFlag = true;
  boolean cauldronFlag = true;
  boolean gnuFlag = true;
  boolean gooFlag = true;
  boolean meltingpotFlag = true;
  boolean trainFlag = true;
  boolean urneFlag = true;
  boolean virusFlag = true;
  boolean spielbergFlag = true;
  boolean nineFlag = true;
  boolean bringCenterFlag = true;
  boolean endFigureFlag = true;
  boolean startFaceFlag = true;

  MediaTracker tracker;
  MemoryImageSource source;
  Image offImage, myOffImage, offBeanSlant, i, o;
  Image[] tmp, img;

  Graphics g, offG, secondG, thirdG;

  int facesNum;
  int tracked;
  int[] imgw, imgh;
  int absCenterX, absCenterY, abswidth, absheight;
  int frame_rate;
  int[] parameterX;
  int[] parameterY;

  Font f;
  FontMetrics fm;
  Label emboss;

  final int FLIP_H_V = 1;
  final int FLIP_H_RIGHT = 2;
  final int FLIP_V = 3;
  final int SCALE = 4;

  final static double flot = 0.842696629213483;
  final static double flot2 = 0.75;

  final static Color violet = new Color(150, 0, 255);

  final static int Xarra[] = {203, 203, 244, 285, 326, 367, 396, 408, 405,
386, 349,
      349, 308, 267, 226, 186, 145, 104, 63, 24, 3,
      3, -2, 7, 33, 74, 115, 156, 197, 237, 278,
      278, 319, 360, 390, 403, 400, 381, 344, 303, 262,
      262, 221, 181, 140, 99, 58, 23, 5, 4, 18,
      18, 50, 91, 132, 173};
  final static int Yarra[] = {305, 305, 302, 292, 274, 243, 202, 161, 121,
80, 41,
      41, 17, 2, -4, -5, 1, 14, 36, 74, 115,
      115, 155, 196, 237, 271, 290, 301, 305, 298, 289,
      289, 273, 243, 203, 162, 122, 81, 43, 20, 6,
      6, 0, 0, 7, 22, 46, 85, 126, 166, 207,
      207, 247, 275, 291, 299};

  String imagePieces, str, imagination;
  String name[];
  String s, target, password, musique;
  Thread cdPlayer, ong;
  URL link;
  Vector vecX = new Vector();
  Vector vecY = new Vector();
Dimension dimension;
  public void init() {
 f = new Font("Serif", Font.BOLD | Font.ITALIC, 16);
 setBackground(Color.white);
 setForeground(Color.white);
    dimension = this.getSize();
    abswidth = dimension.width;
    absheight = dimension.height;
    absCenterX = abswidth / 2;
    absCenterY = absheight / 2;
    offBeanSlant = createImage(abswidth, absheight);
    thirdG = offBeanSlant.getGraphics();
<<<<<<<<<<<<<<<<LINE 103

    frame_rate = 18;
    img = new Image[MAXIMAGES];
 tmp = new Image[MAXIMAGES];
    name = new String[MAXIMAGES];
    parameterX = new int[MAXIMAGES];
    parameterY = new int[MAXIMAGES];
    imgw = new int[MAXIMAGES];
    imgh = new int[MAXIMAGES];
    facesNum = 0;
    tracked = 0;
 imagePieces = "head+yeuL+yeuR+yeuGooL+yeuGooR+nose+nosev+noseLw+"
      +
"nostL+nostR+moustache+moustachev+lipUp+lipLw+cheekUp+cheek+startFigure+"
      + "gnu..hu..eu...eu...+yeuGooLV+yeuGooRV+endFigure";
 str = "Jean Pierre Daviau.com";
 imagination = "Imagination needs time and money.";

    // Get parameter "size" from Web page:
    bgsound = getAudioClip(getCodeBase(), getParameter("musique"));
    password = getParameter("password");
    s = getParameter("link");//getCodeBase().toString()
    target = getParameter("target");

        if (s == null)
      s = "file:/C:/learnJava/Applets_divers/MixedWires";

    if (musique == null)
      musique = "files/Chinois.mid";
    if (target == null)
      target = "_blank";
    if (password == null)
      password = "";

          if ((s.substring(11, 23)).equals("arnJava/Applets_")) {
    } else {
     if ((new Y().getIt()).equals("") ) {
    try{
    this.stop();
       }catch(ThreadDeath e){
     e.printStackTrace();
     }
    }
   }

    if (s != null)
      try {
        link = new URL(s);
      } catch (Exception _ex) { }

    tracker = new MediaTracker(this);
    for (StringTokenizer stringtokenizer = new StringTokenizer(imagePieces,
"+");
        stringtokenizer.hasMoreTokens() && tracked < MAXIMAGES; tracked++) {
      name[tracked] = stringtokenizer.nextToken();
      img[tracked] = getImage(getDocumentBase(), "files/" + name[tracked] +
".gif");
      tracker.addImage(img[tracked], tracked);
      while (!tracker.checkID(tracked, true)) {
        pause(50);
      }

      imgw[tracked] = img[tracked].getWidth(null);
      imgh[tracked] = img[tracked].getHeight(null);
      parameterX[tracked] = (absCenterX - (imgw[tracked] / 2));
      parameterY[tracked] = (absCenterY - (imgh[tracked] / 2));
      if (DEBUG)
        System.out.println ("inTracker " + name[tracked] + " " +
imgw[tracked] + " " + imgh[tracked] + " tracked " + tracked);
    }
    barFlag = false;
 int c, t = abswidth-20;
    int[] pixels = new int [t * absheight];

    double radianConversion = (0.45 * Math.PI / 180.0);
    for (int index = 0, y = 0;y < absheight / 5;y++) {
      c = (int)(Math.abs (Math.sin((y + absheight) * radianConversion)) *
255);
      for (int x = 0;x < t;x++) {
        pixels[index++] = ((c << 24) | (0 << 16) | (0 << 8) | 255);
      }
    }
    i = createImage (new MemoryImageSource (
          //could be new DirectColorModel(255 * 3, 255 * 2, 255,24)
          t, absheight / 5, new DirectColorModel((255 << 16) , (255 << 8),
255, (255 << 24)), pixels, 0, t));

    //Creates a graphics context for this component. This method will return
null if this component is currently not on the screen.
    offImage = createImage (t, absheight / 5);
    offG = offImage.getGraphics();
    offG.drawImage(i, 0, 0, this);
    offG.setFont(f);
 fm = offG.getFontMetrics();
    offG.setColor(Color.red);
    offG.drawString(str, (t - fm.stringWidth(str)) / 2, (absheight / 5) -
fm.getHeight());
    //offG.dispose();
=============== end init ============================

  void pause(int i) {
    try {
      Thread.sleep(i);
    } catch (InterruptedException _ex) { }
    return ;
  }

  public void run() {
    if (bgsound != null)
      startPlaying(bgsound);
    cdPlayer.setPriority(1);
    do {
      repaint();
      try {
        Thread.sleep(1000 / frame_rate);
      } catch (InterruptedException _ex) { }}
    while (true);
  }

  public void start() {
    cdPlayer = new Thread(this);
    cdPlayer.start();
    ong = new Thread(this);
  }

  void startPlaying(AudioClip audioclip) {
    if (audioclip != null)
      audioclip.loop();
  }

  public void stop() {
    cdPlayer.stop();
  }

  void stopPlaying(AudioClip audioclip) {
    if (audioclip != null)
      audioclip.stop();
  }

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