1 /*
   2  * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
   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   @key headful
  27   @bug 6758673
  28   @summary Tests that windows are removed from owner's child windows list
  29   @author art: area=awt.toplevel
  30   @run main OwnedWindowsLeak
  31 */
  32 
  33 import java.awt.*;
  34 import java.awt.event.*;
  35 
  36 import java.lang.ref.*;
  37 import java.lang.reflect.*;
  38 
  39 import java.util.*;
  40 
  41 public class OwnedWindowsLeak
  42 {
  43     public static void main(String[] args)
  44     {
  45         Frame owner = new Frame("F");
  46 
  47         // First, create many windows
  48         Vector<WeakReference<Window>> children =
  49             new Vector<WeakReference<Window>>();
  50         for (int i = 0; i < 1000; i++)
  51         {
  52             Window child = new Window(owner);
  53             children.add(new WeakReference<Window>(child));
  54         }
  55 
  56         // Second, make sure all the memory is allocated
  57         Vector garbage = new Vector();
  58         while (true)
  59         {
  60             try
  61             {
  62                 garbage.add(new byte[1000]);
  63             }
  64             catch (OutOfMemoryError e)
  65             {
  66                 break;
  67             }
  68         }
  69         garbage = null;
  70 
  71         // Third, make sure all the weak references are null
  72         for (WeakReference<Window> ref : children)
  73         {
  74             if (ref.get() != null)
  75             {
  76                 throw new RuntimeException("Test FAILED: some of child windows are not GCed");
  77             }
  78         }
  79 
  80         // Fourth, make sure owner's children list contains no elements
  81         try
  82         {
  83             Field f = Window.class.getDeclaredField("ownedWindowList");
  84             f.setAccessible(true);
  85             Vector ownersChildren = (Vector)f.get(owner);
  86             if (ownersChildren.size() > 0)
  87             {
  88                 throw new RuntimeException("Test FAILED: some of the child windows are not removed from owner's children list");
  89             }
  90         }
  91         catch (NoSuchFieldException z)
  92         {
  93             System.out.println("Test PASSED: no 'ownedWindowList' field in Window class");
  94             return;
  95         }
  96         catch (Exception z)
  97         {
  98             throw new RuntimeException("Test FAILED: unexpected exception", z);
  99         }
 100 
 101         // Test passed
 102         System.out.println("Test PASSED");
 103 
 104         owner.dispose();
 105     }
 106 }