JCK test api/javax_swing/SwingUtilities/descriptions.html#other produce error, and jvm becomes unusable at least on solaris. Here is the code that makes a crash:

        Font[] fonts = GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();
        FontMetrics fm;
        for(int i = 0; i< fonts.length; i++){
            fm = Toolkit.getDefaultToolkit().getFontMetrics(fonts[i]);
            fm.getWidths();
        }