JTable rows gets white with invisible text

Question

I m using a JTable with custom colorRender....(part of the implementation given below)....Sometime all row's text becomes invisible but if you copy this text and paste it into MS-Excel it will successfully copy to excel cells. Furthermore when this problem occurs Java Clinet Console also become distorted and nothing is displayed over there
public Component getTableCellRendererComponent(JTable table,
      Object value,
      boolean isSelected,
      boolean hasFocus,
      int row,
      int column)
       try
          Color bgrd = null;
          Color fgrd = null;
          Font fnt = null;
          if (isSelected)
               column = table.convertColumnIndexToModel(column);
               // Get the colors from the provider
               FontColorInfo FCInfo = ColorProvider.getFontColorInfo(row, column);
               if (FCInfo != null)
                   bgrd = new Color( 255 - FCInfo.getBGColor().getRed(),
                                            255 - FCInfo.getBGColor().getGreen(),
                                            255 - FCInfo.getBGColor().getBlue()); //FCInfo.getBGColor().getBlue();
                  fgrd = new Color(  255 - FCInfo.getFGColor().getRed(),
                                            255 - FCInfo.getFGColor().getGreen(),
                                            255 - FCInfo.getFGColor().getBlue()); //FCInfo.getFGColor();
                  fnt = FCInfo.getFont();
                  doBlinkCurrentRow = FCInfo.getDoBlink();
    else
      // Adjust for columns moving around
      column = table.convertColumnIndexToModel(column);
      // Get the colors from the provider
      FontColorInfo FCInfo = ColorProvider.getFontColorInfo(row, column); //doesnt depend upon col yet
      if (FCInfo != null) {
        fgrd = FCInfo.getFGColor();
        bgrd = FCInfo.getBGColor();
        fnt = FCInfo.getFont();
        doBlinkCurrentRow = FCInfo.getDoBlink();
    Component c = //super.getTableCellRendererComponent(table, value, isSelected,hasFocus, row, column);
        delegate.getTableCellRendererComponent(table, value, isSelected,
                                               hasFocus, row, column);
    /////////   for Column Header
    if (row < 0) {
      c.setBackground(table.getBackground());
      c.setForeground(table.getForeground());
      c.setFont(table.getFont());
    else { // Set the component colours of body cells from configurations
      if (bgrd != null && fgrd != null) {
        if (blnBlink && doBlinkCurrentRow && blnSwap) {
          c.setForeground(bgrd);
          c.setBackground(fgrd);
        else {
          c.setBackground(bgrd);
          c.setForeground(fgrd);
      if (bgrd == null && fgrd == null) { //empty rows
        c.setBackground(ColorProvider.getDefaultBackGroundColor());
        c.setForeground(ColorProvider.getDefaultForeGroundColor());
      if (fnt != null) {
        c.setFont(fnt);
    JLabel jCellVal = (JLabel) c; //as cells are JLabels
    if (value instanceof CellInfo) {
      jCellVal.setText( ( (CellInfo) value).text);
      jCellVal.setIcon( ( (CellInfo) value).icon);
    else {
      jCellVal.setText( (value == null) ? "" : value.toString());
      jCellVal.setIcon(null);
    if(row < 0) //headers
      jCellVal.setHorizontalAlignment(JLabel.CENTER);
    else
      jCellVal.setHorizontalAlignment(JLabel.LEFT);
    return c;
  catch(Exception ex)
  return null;
}

Answer 1

What I was pointing you is that the tutorial and also API explains tha the JTable uses only a single renderer instance, at the first level rendering table data, to render all cells of the table.
>
public class DefaultTableCellRenderer (implementation note)
The table class defines a single cell renderer and uses it as a as a rubber-stamp for rendering all cells in the table;
>
So be careful with your DefaultTableCellRenderer variable values which can (when erroneous algo) keep value of a previous rendered cell.
- doBlinkCurrentRow
- blnBlink
- blnSwap
Why this code ???
                 if (blnBlink && doBlinkCurrentRow && blnSwap) {
                   c.setForeground(bgrd);
                   c.setBackground(fgrd);
                 else {
                   c.setBackground(bgrd);
                   c.setForeground(fgrd);
To discover the bad line in you code, go step by step to identify the bad code in your rendering algo.