1 /*
   2   @test
   3   @bug 4980592
   4   @summary switching user in XP causes an NPE in sun.awt.windows.WWindowPeer.displayChanged
   5   @requires (os.family == "windows")
   6   @modules java.desktop/java.awt.peer
   7   @modules java.desktop/sun.awt.windows
   8   @modules java.desktop/sun.awt
   9   @author son@sparc.spb.su: area=embedded
  10   @run main DisplayChangedTest
  11 */
  12 
  13 /**
  14  * DisplayChangedTest.java
  15  *
  16  * summary: switching user in XP causes an NPE in sun.awt.windows.WWindowPeer.displayChanged
  17  */
  18 
  19 import java.awt.Frame;
  20 import java.awt.Dialog;
  21 import java.awt.TextArea;
  22 import java.awt.peer.ComponentPeer;
  23 import java.awt.peer.FramePeer;
  24 
  25 import java.lang.reflect.Constructor;
  26 import java.lang.reflect.Method;
  27 import java.lang.reflect.Field;
  28 
  29 import sun.awt.AWTAccessor;
  30 
  31 public class DisplayChangedTest
  32 {
  33     private static void init()
  34     {
  35         //*** Create instructions for the user here ***
  36 
  37         String[] instructions =
  38         {
  39             "This is an AUTOMATIC test, simply wait until it is done.",
  40             "The result (passed or failed) will be shown in the",
  41             "message window below."
  42         };
  43         Sysout.createDialog( );
  44         Sysout.printInstructions( instructions );
  45 
  46         if (!System.getProperty("os.name").startsWith("Windows")) {
  47             System.out.println("This is Windows only test.");
  48             DisplayChangedTest.pass();
  49             return;
  50         }
  51 
  52         try {
  53             Frame frame = new Frame("AWT Frame");
  54             frame.pack();
  55 
  56             FramePeer frame_peer = AWTAccessor.getComponentAccessor().getPeer(frame);
  57             Sysout.println("frame's peer = " + frame_peer);
  58             Class comp_peer_class =
  59                 Class.forName("sun.awt.windows.WComponentPeer");
  60             Sysout.println("comp peer class = " + comp_peer_class);
  61             Field hwnd_field = comp_peer_class.getDeclaredField("hwnd");
  62             hwnd_field.setAccessible(true);
  63             Sysout.println("hwnd_field =" + hwnd_field);
  64             long hwnd = hwnd_field.getLong(frame_peer);
  65             Sysout.println("hwnd = " + hwnd);
  66 
  67             Class clazz = Class.forName("sun.awt.windows.WEmbeddedFrame");
  68             Constructor constructor = clazz.getConstructor (new Class [] {long.class});
  69             Frame embedded_frame =
  70                 (Frame) constructor.newInstance (new Object[] {new Long(hwnd)});;
  71             Sysout.println("embedded_frame = " + embedded_frame);
  72             frame.setVisible(true);
  73 
  74             ComponentPeer peer = AWTAccessor.getComponentAccessor().getPeer(embedded_frame);
  75             Sysout.println("peer = " + peer);
  76             Class peerClass = peer.getClass();
  77             Sysout.println("peer's class = " + peerClass);
  78 
  79             Method displayChangedM =
  80                 peerClass.getMethod("displayChanged", new Class[0]);
  81             displayChangedM.invoke(peer, null);
  82             embedded_frame.dispose();
  83             frame.dispose();
  84         } catch (Throwable thr) {
  85             thr.printStackTrace();
  86             DisplayChangedTest.fail("TEST FAILED: " + thr);
  87         }
  88         DisplayChangedTest.pass();
  89 
  90     }//End  init()
  91 
  92 
  93 
  94     /*****************************************************
  95      * Standard Test Machinery Section
  96      * DO NOT modify anything in this section -- it's a
  97      * standard chunk of code which has all of the
  98      * synchronisation necessary for the test harness.
  99      * By keeping it the same in all tests, it is easier
 100      * to read and understand someone else's test, as
 101      * well as insuring that all tests behave correctly
 102      * with the test harness.
 103      * There is a section following this for test-
 104      * classes
 105      ******************************************************/
 106     private static boolean theTestPassed = false;
 107     private static boolean testGeneratedInterrupt = false;
 108     private static String failureMessage = "";
 109 
 110     private static Thread mainThread = null;
 111 
 112     private static int sleepTime = 300000;
 113 
 114     // Not sure about what happens if multiple of this test are
 115     //  instantiated in the same VM.  Being static (and using
 116     //  static vars), it aint gonna work.  Not worrying about
 117     //  it for now.
 118     public static void main( String args[] ) throws InterruptedException
 119     {
 120         mainThread = Thread.currentThread();
 121         try
 122         {
 123             init();
 124         }
 125         catch( TestPassedException e )
 126         {
 127             //The test passed, so just return from main and harness will
 128             // interepret this return as a pass
 129             return;
 130         }
 131         //At this point, neither test pass nor test fail has been
 132         // called -- either would have thrown an exception and ended the
 133         // test, so we know we have multiple threads.
 134 
 135         //Test involves other threads, so sleep and wait for them to
 136         // called pass() or fail()
 137         try
 138         {
 139             Thread.sleep( sleepTime );
 140             //Timed out, so fail the test
 141             throw new RuntimeException( "Timed out after " + sleepTime/1000 + " seconds" );
 142         }
 143         catch (InterruptedException e)
 144         {
 145             //The test harness may have interrupted the test.  If so, rethrow the exception
 146             // so that the harness gets it and deals with it.
 147             if( ! testGeneratedInterrupt ) throw e;
 148 
 149             //reset flag in case hit this code more than once for some reason (just safety)
 150             testGeneratedInterrupt = false;
 151 
 152             if ( theTestPassed == false )
 153             {
 154                 throw new RuntimeException( failureMessage );
 155             }
 156         }
 157 
 158     }//main
 159 
 160     public static synchronized void setTimeoutTo( int seconds )
 161     {
 162         sleepTime = seconds * 1000;
 163     }
 164 
 165     public static synchronized void pass()
 166     {
 167         Sysout.println( "The test passed." );
 168         Sysout.println( "The test is over, hit  Ctl-C to stop Java VM" );
 169         //first check if this is executing in main thread
 170         if ( mainThread == Thread.currentThread() )
 171         {
 172             //Still in the main thread, so set the flag just for kicks,
 173             // and throw a test passed exception which will be caught
 174             // and end the test.
 175             theTestPassed = true;
 176             throw new TestPassedException();
 177         }
 178         theTestPassed = true;
 179         testGeneratedInterrupt = true;
 180         mainThread.interrupt();
 181     }//pass()
 182 
 183     public static synchronized void fail()
 184     {
 185         //test writer didn't specify why test failed, so give generic
 186         fail( "it just plain failed! :-)" );
 187     }
 188 
 189     public static synchronized void fail( String whyFailed )
 190     {
 191         Sysout.println( "The test failed: " + whyFailed );
 192         Sysout.println( "The test is over, hit  Ctl-C to stop Java VM" );
 193         //check if this called from main thread
 194         if ( mainThread == Thread.currentThread() )
 195         {
 196             //If main thread, fail now 'cause not sleeping
 197             throw new RuntimeException( whyFailed );
 198         }
 199         theTestPassed = false;
 200         testGeneratedInterrupt = true;
 201         failureMessage = whyFailed;
 202         mainThread.interrupt();
 203     }//fail()
 204 
 205 }// class DisplayChangedTest
 206 
 207 //This exception is used to exit from any level of call nesting
 208 // when it's determined that the test has passed, and immediately
 209 // end the test.
 210 class TestPassedException extends RuntimeException
 211 {
 212 }
 213 
 214 //*********** End Standard Test Machinery Section **********
 215 
 216 
 217 //************ Begin classes defined for the test ****************
 218 
 219 // if want to make listeners, here is the recommended place for them, then instantiate
 220 //  them in init()
 221 
 222 /* Example of a class which may be written as part of a test
 223 class NewClass implements anInterface
 224  {
 225    static int newVar = 0;
 226 
 227    public void eventDispatched(AWTEvent e)
 228     {
 229       //Counting events to see if we get enough
 230       eventCount++;
 231 
 232       if( eventCount == 20 )
 233        {
 234          //got enough events, so pass
 235 
 236          DisplayChangedTest.pass();
 237        }
 238       else if( tries == 20 )
 239        {
 240          //tried too many times without getting enough events so fail
 241 
 242          DisplayChangedTest.fail();
 243        }
 244 
 245     }// eventDispatched()
 246 
 247  }// NewClass class
 248 
 249 */
 250 
 251 
 252 //************** End classes defined for the test *******************
 253 
 254 
 255 
 256 
 257 /****************************************************
 258  Standard Test Machinery
 259  DO NOT modify anything below -- it's a standard
 260   chunk of code whose purpose is to make user
 261   interaction uniform, and thereby make it simpler
 262   to read and understand someone else's test.
 263  ****************************************************/
 264 
 265 /**
 266  This is part of the standard test machinery.
 267  It creates a dialog (with the instructions), and is the interface
 268   for sending text messages to the user.
 269  To print the instructions, send an array of strings to Sysout.createDialog
 270   WithInstructions method.  Put one line of instructions per array entry.
 271  To display a message for the tester to see, simply call Sysout.println
 272   with the string to be displayed.
 273  This mimics System.out.println but works within the test harness as well
 274   as standalone.
 275  */
 276 
 277 class Sysout
 278 {
 279     private static TestDialog dialog;
 280 
 281     public static void createDialogWithInstructions( String[] instructions )
 282     {
 283         dialog = new TestDialog( new Frame(), "Instructions" );
 284         dialog.printInstructions( instructions );
 285         dialog.setVisible(true);
 286         println( "Any messages for the tester will display here." );
 287     }
 288 
 289     public static void createDialog( )
 290     {
 291         dialog = new TestDialog( new Frame(), "Instructions" );
 292         String[] defInstr = { "Instructions will appear here. ", "" } ;
 293         dialog.printInstructions( defInstr );
 294         dialog.setVisible(true);
 295         println( "Any messages for the tester will display here." );
 296     }
 297 
 298 
 299     public static void printInstructions( String[] instructions )
 300     {
 301         dialog.printInstructions( instructions );
 302     }
 303 
 304 
 305     public static void println( String messageIn )
 306     {
 307         dialog.displayMessage( messageIn );
 308         System.out.println(messageIn);
 309     }
 310 
 311 }// Sysout  class
 312 
 313 /**
 314   This is part of the standard test machinery.  It provides a place for the
 315    test instructions to be displayed, and a place for interactive messages
 316    to the user to be displayed.
 317   To have the test instructions displayed, see Sysout.
 318   To have a message to the user be displayed, see Sysout.
 319   Do not call anything in this dialog directly.
 320   */
 321 class TestDialog extends Dialog
 322 {
 323 
 324     TextArea instructionsText;
 325     TextArea messageText;
 326     int maxStringLength = 80;
 327 
 328     //DO NOT call this directly, go through Sysout
 329     public TestDialog( Frame frame, String name )
 330     {
 331         super( frame, name );
 332         int scrollBoth = TextArea.SCROLLBARS_BOTH;
 333         instructionsText = new TextArea( "", 15, maxStringLength, scrollBoth );
 334         add( "North", instructionsText );
 335 
 336         messageText = new TextArea( "", 5, maxStringLength, scrollBoth );
 337         add("Center", messageText);
 338 
 339         pack();
 340 
 341         setVisible(true);
 342     }// TestDialog()
 343 
 344     //DO NOT call this directly, go through Sysout
 345     public void printInstructions( String[] instructions )
 346     {
 347         //Clear out any current instructions
 348         instructionsText.setText( "" );
 349 
 350         //Go down array of instruction strings
 351 
 352         String printStr, remainingStr;
 353         for( int i=0; i < instructions.length; i++ )
 354         {
 355             //chop up each into pieces maxSringLength long
 356             remainingStr = instructions[ i ];
 357             while( remainingStr.length() > 0 )
 358             {
 359                 //if longer than max then chop off first max chars to print
 360                 if( remainingStr.length() >= maxStringLength )
 361                 {
 362                     //Try to chop on a word boundary
 363                     int posOfSpace = remainingStr.
 364                         lastIndexOf( ' ', maxStringLength - 1 );
 365 
 366                     if( posOfSpace <= 0 ) posOfSpace = maxStringLength - 1;
 367 
 368                     printStr = remainingStr.substring( 0, posOfSpace + 1 );
 369                     remainingStr = remainingStr.substring( posOfSpace + 1 );
 370                 }
 371                 //else just print
 372                 else
 373                 {
 374                     printStr = remainingStr;
 375                     remainingStr = "";
 376                 }
 377 
 378                 instructionsText.append( printStr + "\n" );
 379 
 380             }// while
 381 
 382         }// for
 383 
 384     }//printInstructions()
 385 
 386     //DO NOT call this directly, go through Sysout
 387     public void displayMessage( String messageIn )
 388     {
 389         messageText.append( messageIn + "\n" );
 390         System.out.println(messageIn);
 391     }
 392 
 393 }// TestDialog  class