test/jdk/java/awt/Graphics2D/TestNullClip.java

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import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.Shape;

/**
 * @test
 * @bug 6206189
 * @summary Verifies passing null to Graphics2D.clip(Shape) throws NPE.
 */
public class TestNullClip {

    public static void main(String[] argv) {
        BufferedImage bi = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = (Graphics2D)bi.getGraphics();

        g2d.clip(null); // silently return, no NPE should be thrown

        g2d.setClip(0, 0, 100, 100);
        g2d.setClip(null);
        Shape clip1 = g2d.getClip();
        if (clip1 != null) {
            throw new RuntimeException("Clip is not cleared");
        }
        g2d.setClip(0, 0, 100, 100);
        try {
            g2d.clip(null);
            throw new RuntimeException("NPE is expected");
        } catch (NullPointerException e) {
            //expected
            System.out.println("NPE is thrown");
        }
    }
}