ADDITIONAL SYSTEM INFORMATION :
Windows 10.0.19043.1415

A DESCRIPTION OF THE PROBLEM :
When (unintentionally) running path.append() to itself, I get an undocumented ArrayIndexOutOfBoundsException. This behavior should either be documented in the javadoc, or avoided.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run code

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
nothing
ACTUAL -
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at java.awt.geom.Path2D$Float$CopyIterator.currentSegment(Path2D.java:1001)
at java.awt.geom.Path2D$Float.append(Path2D.java:730)
at NewClass.main(NewClass.java:19)

---------- BEGIN SOURCE ----------

import java.awt.geom.GeneralPath;

public class NewClass
{

    public static void main(String[] args)
    {
        GeneralPath path = createPath();
        path.append(path.getPathIterator(null), true);
    }

    static GeneralPath createPath()
    {
        GeneralPath path = new GeneralPath();
        path.moveTo(150.0, 524.0);
        path.lineTo(67.0, 524.0);
        path.closePath();
        return path;
    }
}

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

CUSTOMER SUBMITTED WORKAROUND :
avoid appending path to itself

FREQUENCY : always