Eclipse RCP Experiments

How to set color and font for a table cell using TableViewer in JFace?

All you need to do is make your ITableLabelProvider implementation also implement ITableFontProvider and ITableColorProvider.

public class TypeLabelProvider implements ITableLabelProvider, 
ITableFontProvider, ITableColorProvider {
     ...
     ...
     ITableLabelProvider methods
     ...
     ...

     @Override
     public Font getFont(Object element, int columnIndex) {
           return JFaceResources.getFontRegistry().getBold(
                                   JFaceResources.DIALOG_FONT);
     }

     @Override
     public Color getBackground(Object element, int columnIndex) {
           return new Color(display, new RGB(125,189,0));
     }

     @Override
     public Color getForeground(Object element, int columnIndex) {
         return new Color(display, new RGB(125,189,0));
     }
}