1 /*
   2  * Copyright (c) 2013, 2015, 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 4980592 8171363
  27  @summary   switching user in XP causes an NPE in
  28             sun.awt.windows.WWindowPeer.displayChanged
  29  @requires (os.family == "windows")
  30  @modules java.desktop/java.awt.peer
  31  @modules java.desktop/sun.awt.windows:open
  32  @modules java.desktop/sun.awt
  33  @author son@sparc.spb.su: area=embedded
  34  @run main DisplayChangedTest
  35  */
  36 /**
  37  * DisplayChangedTest.java
  38  *
  39  * summary: switching user in XP causes an NPE in
  40  * sun.awt.windows.WWindowPeer.displayChanged
  41  */
  42 import java.awt.Frame;
  43 import java.awt.Dialog;
  44 import java.awt.TextArea;
  45 import java.awt.peer.ComponentPeer;
  46 import java.awt.peer.FramePeer;
  47 import java.lang.reflect.Constructor;
  48 import java.lang.reflect.Method;
  49 import java.lang.reflect.Field;
  50 
  51 import sun.awt.AWTAccessor;
  52 
  53 public class DisplayChangedTest {
  54 
  55     /**
  56      * Test fails if it throws any exception.
  57      *
  58      * @throws Exception
  59      */
  60     private void init() throws Exception {
  61 
  62         if (!System.getProperty("os.name").startsWith("Windows")) {
  63             System.out.println("This is Windows only test.");
  64             return;
  65         }
  66 
  67         Frame frame = new Frame("AWT Frame");
  68         frame.pack();
  69 
  70         FramePeer frame_peer = AWTAccessor.getComponentAccessor()
  71                 .getPeer(frame);
  72         Class comp_peer_class = Class.forName("sun.awt.windows.WComponentPeer");
  73         Field hwnd_field = comp_peer_class.getDeclaredField("hwnd");
  74         hwnd_field.setAccessible(true);
  75         long hwnd = hwnd_field.getLong(frame_peer);
  76 
  77         Class clazz = Class.forName("sun.awt.windows.WEmbeddedFrame");
  78         Constructor constructor = clazz
  79                 .getConstructor(new Class[]{long.class});
  80         Frame embedded_frame = (Frame) constructor
  81                 .newInstance(new Object[]{new Long(hwnd)});
  82         frame.setVisible(true);
  83 
  84         ComponentPeer peer = AWTAccessor.getComponentAccessor().getPeer(
  85                 embedded_frame);
  86         Class peerClass = peer.getClass();
  87         Method displayChangedM = peerClass.getMethod("displayChanged",
  88                 new Class[0]);
  89         displayChangedM.invoke(peer, null);
  90         embedded_frame.dispose();
  91         frame.dispose();
  92 
  93     }
  94 
  95     public static void main(String args[]) throws Exception {
  96         new DisplayChangedTest().init();
  97     }
  98 
  99 }