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.
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  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 }