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