1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   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 6758673
  27   @summary Tests that windows are removed from owner's child windows list
  28   @author art: area=awt.toplevel
  29   @run main OwnedWindowsLeak
  30 */
  31 
  32 import java.awt.*;
  33 import java.awt.event.*;
  34 
  35 import java.lang.ref.*;
  36 import java.lang.reflect.*;
  37 
  38 import java.util.*;
  39 
  40 public class OwnedWindowsLeak
  41 {
  42     public static void main(String[] args)
  43     {
  44         Frame owner = new Frame("F");
  45 
  46         // First, create many windows
  47         Vector<WeakReference<Window>> children =
  48             new Vector<WeakReference<Window>>();
  49         for (int i = 0; i < 1000; i++)
  50         {
  51             Window child = new Window(owner);
  52             children.add(new WeakReference<Window>(child));
  53         }
  54 
  55         // Second, make sure all the memory is allocated
  56         Vector garbage = new Vector();
  57         while (true)
  58         {
  59             try
  60             {
  61                 garbage.add(new byte[1000]);
  62             }
  63             catch (OutOfMemoryError e)
  64             {
  65                 break;
  66             }
  67         }
  68         garbage = null;
  69 
  70         // Third, make sure all the weak references are null
  71         for (WeakReference<Window> ref : children)
  72         {
  73             if (ref.get() != null)
  74             {
  75                 throw new RuntimeException("Test FAILED: some of child windows are not GCed");
  76             }
  77         }
  78 
  79         // Fourth, make sure owner's children list contains no elements
  80         try
  81         {
  82             Field f = Window.class.getDeclaredField("ownedWindowList");
  83             f.setAccessible(true);
  84             Vector ownersChildren = (Vector)f.get(owner);
  85             if (ownersChildren.size() > 0)
  86             {
  87                 throw new RuntimeException("Test FAILED: some of the child windows are not removed from owner's children list");
  88             }
  89         }
  90         catch (NoSuchFieldException z)
  91         {
  92             System.out.println("Test PASSED: no 'ownedWindowList' field in Window class");
  93             return;
  94         }
  95         catch (Exception z)
  96         {
  97             throw new RuntimeException("Test FAILED: unexpected exception", z);
  98         }
  99 
 100         // Test passed
 101         System.out.println("Test PASSED");
 102 
 103         owner.dispose();
 104     }
 105 }