fillPolygon() is broken on java 1.3,, solaris/sparc.
Following program demonstrates the bug.
Draws a polygon and then fills the same polygon.  Use xmag to see detail.
It's easy to see the two don't match:

nairobi$ java -version
java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0)
Java HotSpot(TM) Client VM (build 1.3.0, mixed mode)
nairobi$ uname -a
SunOS nairobi 5.8 Generic_108528-01 sun4u sparc SUNW,Ultra-80
nairobi$ cat FillPolygon.java  
import java.awt.*;
import javax.swing.*;

public class FillPolygon extends JComponent {

    public void paint(Graphics g) {
        int x[] = new int[] {1, 8, 14,  8,  1};
        int y[] = new int[] {1, 1,  7, 13, 13};
        Polygon thumb = new Polygon(x, y, x.length);

        g.setColor(Color.green);
        g.fillRect(0, 0, 50, 50);

        g.setColor(Color.red);

        g.drawPolygon(thumb);
        g.translate( 15, 0 );
        g.fillPolygon(thumb); // BUG!
    }

    static public void main(String args[]) {
        JFrame f = new JFrame();
        f.getContentPane().add(new FillPolygon());
        f.setSize(100, 100);
        f.setVisible(true);
    }
}