Program: 88738
Project: 88738
Buggy source:
@Override public void ancestorAdded(AncestorEvent e){
  Debug.outln("String_Node_Str" + e + "String_Node_Str");
  JComponent component=e.getComponent();
  component.requestFocusInWindow();
  if (component instanceof JTextField) {
    ((JTextField)component).selectAll();
  }
  JWindow top=getTopComponentOfType(component,JWindow.class);
  JDialog dialog=getTopComponentOfType(component,JDialog.class);
  Window win=(dialog == null ? top : dialog);
  try {
    if (win != null) {
      GraphicsDevice gd=GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
      Dimension screenSize=new Dimension(gd.getDisplayMode().getWidth(),gd.getDisplayMode().getHeight());
      if (!win.getMaximumSize().equals(screenSize)) {
        win.setMaximumSize(screenSize);
      }
      if (!win.getPreferredSize().equals(size)) {
        win.setPreferredSize(size);
      }
      if (location != null && !win.getLocation().equals(location)) {
        win.setLocation(location);
      }
      win.setMinimumSize(new Dimension(200,100));
      boolean found=false;
      for (      WindowListener wl : win.getWindowListeners()) {
        if (wl.getClass().equals(WinListener.class)) {
          found=true;
          break;
        }
      }
      if (!found)       win.addWindowListener(new WinListener());
      for (      ComponentListener wl : win.getComponentListeners()) {
        if (wl.getClass().equals(SizeListener.class)) {
          found=true;
          break;
        }
      }
      if (!found)       win.addComponentListener(new SizeListener());
      found=false;
      if (dialog != null) {
        dialog.setResizable(true);
        Debug.outln("String_Node_Str" + dialog.toString());
      }
 else       if (top != null) {
        Debug.outln("String_Node_Str" + component.getRootPane().toString());
        System.out.println("String_Node_Str" + top.toString());
      }
    }
  }
 catch (  NullPointerException npe) {
    Debug.errln(npe.getMessage());
  }
  if (removeListener)   component.removeAncestorListener(this);
}

Fixed version (ground truth):
@Override public void ancestorAdded(AncestorEvent e){
  Debug.outln("String_Node_Str" + e + "String_Node_Str");
  JComponent component=e.getComponent();
  component.requestFocusInWindow();
  if (component instanceof JTextField) {
    ((JTextField)component).selectAll();
  }
  JWindow top=getTopComponentOfType(component,JWindow.class);
  JDialog dialog=getTopComponentOfType(component,JDialog.class);
  Window win=(dialog == null ? top : dialog);
  Window w=win;
  Debug.outln("String_Node_Str" + w);
  if (win != w) {
    Debug.error(false,"String_Node_Str");
    if (w != null) {
      win=w;
      if (w instanceof JDialog)       dialog=(JDialog)w;
    }
  }
  try {
    if (win != null) {
      GraphicsDevice gd=GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
      Dimension screenSize=new Dimension(gd.getDisplayMode().getWidth(),gd.getDisplayMode().getHeight());
      if (!win.getMaximumSize().equals(screenSize)) {
        win.setMaximumSize(screenSize);
      }
      if (!win.getPreferredSize().equals(size)) {
        win.setPreferredSize(size);
      }
      if (locationOnClose != null) {
        win.setLocation(locationOnClose);
      }
 else       if (location != null && !win.getLocation().equals(location)) {
        win.setLocation(location);
      }
      if (sizeOnClose != null) {
        win.setSize(sizeOnClose);
      }
      win.setMinimumSize(new Dimension(200,100));
      boolean found=false;
      for (      WindowListener wl : win.getWindowListeners()) {
        if (wl.getClass().equals(WinListener.class)) {
          found=true;
          break;
        }
      }
      if (!found)       win.addWindowListener(new WinListener());
      for (      ComponentListener wl : win.getComponentListeners()) {
        if (wl.getClass().equals(SizeListener.class)) {
          found=true;
          break;
        }
      }
      if (!found)       win.addComponentListener(new SizeListener());
      found=false;
      if (dialog != null) {
        dialog.setResizable(true);
        Debug.outln("String_Node_Str" + dialog.toString());
      }
 else       if (top != null) {
        Debug.outln("String_Node_Str" + component.getRootPane().toString());
        System.out.println("String_Node_Str" + top.toString());
      }
    }
  }
 catch (  NullPointerException npe) {
    Debug.errln(npe.getMessage());
  }
  if (removeListener)   component.removeAncestorListener(this);
}