1 /* 2 * Copyright (c) 2002, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 8189204 27 * @summary Possible NPE in Component::getLocationOnScreen() 28 * @key headful 29 * @run main ComponentGetLocationOnScreenNPETest 30 */ 31 32 import javax.swing.*; 33 import java.awt.*; 34 35 public class ComponentGetLocationOnScreenNPETest { 36 37 private static Frame frame; 38 private static JPanel panel; 39 40 public static void main(String[] args) throws Exception { 41 SwingUtilities.invokeAndWait(() -> { 42 frame = new Frame(); 43 JPanel parentPanel = new JPanel() { 44 @Override 45 public Container getParent() { 46 return new Frame(); 47 } 48 }; 49 frame.add(parentPanel); 50 panel = new JPanel(); 51 parentPanel.add(panel); 52 frame.setVisible(true); 53 }); 54 Robot robot = new Robot(); 55 robot.waitForIdle(); 56 robot.delay(200); 57 58 SwingUtilities.invokeAndWait(panel::getLocationOnScreen); 59 SwingUtilities.invokeLater(frame::dispose); 60 } 61 }