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