Program: 21425
Project: 21425
Buggy source:
/** 
 * Debug Methode. Zeigt den Captcha in verschiedenen bearbeitungsstadien an
 * @param captchafile
 */
public void showPreparedCaptcha(File captchafile){
  if (!captchafile.exists()) {
    logger.severe(captchafile.getAbsolutePath() + "String_Node_Str");
    return;
  }
  Image captchaImage;
  captchaImage=UTILITIES.loadImage(captchafile);
  if (bw3 != null) {
    bw3.destroy();
  }
  bw3=BasicWindow.showImage(captchaImage,"String_Node_Str");
  bw3.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(2,0,2,2));
  bw3.setLocationByScreenPercent(50,70);
  Captcha captcha=createCaptcha(captchaImage);
  bw3.add(new ImageComponent(captcha.getImage(1)),UTILITIES.getGBC(0,2,2,2));
  bw3.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(2,2,2,2));
  jas.executePrepareCommands(captcha);
  bw3.add(new ImageComponent(captcha.getImage(1)),UTILITIES.getGBC(0,4,2,2));
  bw3.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(2,4,2,2));
  Letter[] letters=captcha.getLetters(letterNum);
  if (letters == null) {
    logger.severe("String_Node_Str");
    return;
  }
  bw3.add(new ImageComponent(captcha.getImageWithGaps(1)),UTILITIES.getGBC(0,6,2,2));
  bw3.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(2,6,2,2));
  bw3.refreshUI();
  if (bw2 != null) {
    bw2.destroy();
  }
  bw2=new BasicWindow();
  bw2.setTitle("String_Node_Str");
  bw2.setLayout(new GridBagLayout());
  bw2.setSize(300,300);
  logger.info("String_Node_Str");
  bw2.setAlwaysOnTop(true);
  bw2.setLocationByScreenPercent(50,5);
  bw2.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(0,0,2,2));
  Letter test=letters[2].getLinedLetter();
  BasicWindow.showImage(test.getImage(10));
  for (int i=0; i < letters.length; i++) {
    bw2.add(new ImageComponent(letters[i].getImage(jas.getInteger("String_Node_Str"))),UTILITIES.getGBC(i * 2 + 2,0,2,2));
  }
  bw2.setVisible(true);
  bw2.pack();
  bw2.setSize(300,bw2.getSize().height);
  checkCaptcha(captcha);
  LetterComperator[] lcs=captcha.getLetterComperators();
  for (int i=0; i < lcs.length; i++) {
    if (lcs[i] == null)     continue;
    bw2.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(0,6,2,2));
    bw2.add(new ImageComponent(lcs[i].getB().getImage(jas.getInteger("String_Node_Str"))),UTILITIES.getGBC(i * 2 + 2,6,2,2));
    bw2.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(0,8,2,2));
    bw2.add(new JLabel(lcs[i].getDecodedValue()),UTILITIES.getGBC(i * 2 + 2,8,2,2));
    bw2.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(0,10,2,2));
    bw2.add(new JLabel(lcs[i].getValityPercent() + "String_Node_Str"),UTILITIES.getGBC(i * 2 + 2,10,2,2));
  }
  bw2.pack();
  bw2.repack();
}

Fixed version (ground truth):
/** 
 * Debug Methode. Zeigt den Captcha in verschiedenen bearbeitungsstadien an
 * @param captchafile
 */
public void showPreparedCaptcha(File captchafile){
  if (!captchafile.exists()) {
    logger.severe(captchafile.getAbsolutePath() + "String_Node_Str");
    return;
  }
  Image captchaImage;
  captchaImage=UTILITIES.loadImage(captchafile);
  if (bw3 != null) {
    bw3.destroy();
  }
  bw3=BasicWindow.showImage(captchaImage,"String_Node_Str");
  bw3.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(2,0,2,2));
  bw3.setLocationByScreenPercent(50,70);
  Captcha captcha=createCaptcha(captchaImage);
  bw3.add(new ImageComponent(captcha.getImage(1)),UTILITIES.getGBC(0,2,2,2));
  bw3.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(2,2,2,2));
  jas.executePrepareCommands(captcha);
  bw3.add(new ImageComponent(captcha.getImage(1)),UTILITIES.getGBC(0,4,2,2));
  bw3.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(2,4,2,2));
  Letter[] letters=captcha.getLetters(letterNum);
  if (letters == null) {
    logger.severe("String_Node_Str");
    return;
  }
  bw3.add(new ImageComponent(captcha.getImageWithGaps(1)),UTILITIES.getGBC(0,6,2,2));
  bw3.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(2,6,2,2));
  bw3.refreshUI();
  if (bw2 != null) {
    bw2.destroy();
  }
  bw2=new BasicWindow();
  bw2.setTitle("String_Node_Str");
  bw2.setLayout(new GridBagLayout());
  bw2.setSize(300,300);
  logger.info("String_Node_Str");
  bw2.setAlwaysOnTop(true);
  bw2.setLocationByScreenPercent(50,5);
  bw2.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(0,0,2,2));
  for (int i=0; i < letters.length; i++) {
    bw2.add(new ImageComponent(letters[i].getImage(jas.getInteger("String_Node_Str"))),UTILITIES.getGBC(i * 2 + 2,0,2,2));
  }
  bw2.setVisible(true);
  bw2.pack();
  bw2.setSize(300,bw2.getSize().height);
  checkCaptcha(captcha);
  LetterComperator[] lcs=captcha.getLetterComperators();
  for (int i=0; i < lcs.length; i++) {
    if (lcs[i] == null)     continue;
    bw2.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(0,6,2,2));
    bw2.add(new ImageComponent(lcs[i].getB().getImage(jas.getInteger("String_Node_Str"))),UTILITIES.getGBC(i * 2 + 2,6,2,2));
    bw2.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(0,8,2,2));
    bw2.add(new JLabel(lcs[i].getDecodedValue()),UTILITIES.getGBC(i * 2 + 2,8,2,2));
    bw2.add(new JLabel("String_Node_Str"),UTILITIES.getGBC(0,10,2,2));
    bw2.add(new JLabel(lcs[i].getValityPercent() + "String_Node_Str"),UTILITIES.getGBC(i * 2 + 2,10,2,2));
  }
  bw2.pack();
  bw2.repack();
}