FULL PRODUCT VERSION :
java version "1.5.0_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_05-b05)
Java HotSpot(TM) Client VM (build 1.5.0_05-b05, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
The Area.subtract method throws an internal exception for some valid input.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
The following steps will result in an exception being thrown for certain input values.

Create an Arc2D.
Create an Area from the Arc2D.
Create an Ellipse2D.
Create a second area from the Ellipse2D.
Subtract the second area from the first area.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The subtract method should result in a valid shape.
ACTUAL -
The subtract method threw an exception.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.InternalError: bad y (7.52316384526264E-51, 7.527506696442659E-51=>4.249999999999999)
        at sun.awt.geom.Order3.TforY(Order3.java:340)
        at sun.awt.geom.Order3.XforY(Order3.java:499)
        at sun.awt.geom.Curve.compareTo(Curve.java:518)
        at sun.awt.geom.Edge.compareTo(Edge.java:72)
        at sun.awt.geom.AreaOp.pruneEdges(AreaOp.java:260)
        at sun.awt.geom.AreaOp.calculate(AreaOp.java:141)
        at java.awt.geom.Area.subtract(Area.java:140)
        at com.materials_sciences.FrontEnd.GraphicsCrash.<init>(GraphicsCrash.java:43)
        at com.materials_sciences.FrontEnd.GraphicsCrash.main(GraphicsCrash.java:47)


REPRODUCIBILITY :
This bug can be reproduced often.

---------- BEGIN SOURCE ----------
import java.awt.geom.Arc2D;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;

public class GraphicsCrash {
    
    /** Creates a new instance of GraphicsCrash */
    public GraphicsCrash() {
        double x = -4.250000000000002;
        double y = 0.0;
        double width = 8.5;
        double height = 8.5;
        double start = -450.0;
        double extent = 180.0;
        
        Arc2D outerArc = new Arc2D.Double(x, y, width, height, start, extent, Arc2D.PIE);
        
        Area tmp = new Area(outerArc);
        
        x = -4.000000000000002;
        y = 0.25;
        width = 8.0;
        height = 8.0;
        
        Ellipse2D innerArc = new Ellipse2D.Double(x, y, width, height);
        
        tmp.subtract(new Area(innerArc));
    }
    
    public static void main(String[] args) {
        GraphicsCrash gc = new GraphicsCrash();
    }
}

---------- END SOURCE ----------