jxtable with on gridline that is thicker

I have a jxtable. It has horizontalGridLines enabled. here is what it looks like.

I want the horizontal gridline to be thicker. See the desired look below. The line after the 2nd row should have a thicker divider.

You can override the paintComponent method in JXTable. The following example creates a JTable with a line thickness of 3 pixels after the 2nd row:

JXTable table = new JXTable() {
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        // Actual line thickness is: thickness * 2 + 1
        // Increase this as you wish.
        int thickness = 1;

        // Number of rows ABOVE the thick line
        int rowsAbove = 2;

        g.setColor(getGridColor());
        int y = getRowHeight() * rowsAbove - 1;
        g.fillRect(0, y - thickness, getWidth(), thickness * 2 + 1);
    };
};