FULL PRODUCT VERSION :
1.6.0_06-b02

ADDITIONAL OS VERSION INFORMATION :
Windows XP 2600.xpsp.080413-2111:Service Pack 3
Version 5.1

A DESCRIPTION OF THE PROBLEM :
JComponent.setFont() sourse code is :

    public void setFont(Font font) {
        Font oldFont = getFont();
        super.setFont(font);
        // font already bound in AWT1.2
        if (font != oldFont) {
            revalidate();
repaint();
        }
    }

 it should use "equals" methord to verify the changement of the font, like this:

    public void setFont(Font font) {
        Font oldFont = getFont();
        super.setFont(font);
        // font already bound in AWT1.2
        if (oldFont .equals(font)) {
            revalidate();
repaint();
        }
    }


REPRODUCIBILITY :
This bug can be reproduced always.