The following test case creates a RadialGradient with the focus on the
perimeter of the circle. It generates an ArrayIndexOutOfBoundsException.

import java.awt.*;
import java.awt.image.*;
import java.awt.MultipleGradientPaint.*;

public class FocusRadial {
    public static void main(String argv[]) {
        BufferedImage bimg = new BufferedImage(10, 10,
                                               BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = bimg.createGraphics();
        g2d.setPaint(new RadialGradientPaint(5, 5, 2, 3, 5,
                                             new float[] {0f, 1f},
                                             new Color[] {Color.white,
                                                          Color.black},
                                             CycleMethod.REPEAT));
        g2d.fillRect(0, 0, 10, 10);
    }
}