1 /*
   2  * Copyright (c) 2009, 2010, 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  * @bug 6795356
  27  * @summary Leak caused by javax.swing.UIDefaults.ProxyLazyValue.acc
  28  * @author Alexander Potochkin
  29  * @run main bug6795356
  30  */
  31 
  32 import java.lang.ref.WeakReference;
  33 import java.security.ProtectionDomain;
  34 import java.security.AccessController;
  35 import java.security.PrivilegedAction;
  36 import java.security.AccessControlContext;
  37 import java.util.LinkedList;
  38 import java.util.List;
  39 import javax.swing.*;
  40 
  41 public class bug6795356 {
  42     volatile static WeakReference<ProtectionDomain> weakRef;
  43 
  44     public static void main(String[] args) throws Exception {
  45 
  46         ProtectionDomain domain = new ProtectionDomain(null, null);
  47 
  48         AccessController.doPrivileged(new PrivilegedAction<Object>() {
  49             public Object run() {
  50 
  51                 // this initialize ProxyLazyValues
  52                 UIManager.getLookAndFeel();
  53 
  54                 return null;
  55             }
  56         }, new AccessControlContext(new ProtectionDomain[]{domain}));
  57 
  58         weakRef = new WeakReference<ProtectionDomain>(domain);
  59         domain = null;
  60 
  61         // Generate OutOfMemory and check the weak ref
  62         generateOOME();
  63 
  64         if (weakRef.get() != null) {
  65             throw new RuntimeException("Memory leak found!");
  66         }
  67         System.out.println("Test passed");
  68     }
  69 
  70     static void generateOOME() {
  71         List<Object> bigLeak = new LinkedList<Object>();
  72         boolean oome = false;
  73         System.out.print("Filling the heap");
  74         try {
  75             for(int i = 0; true ; i++) {
  76                 // Now, use up all RAM
  77                 bigLeak.add(new byte[1024 * 1024]);
  78                 System.out.print(".");
  79 
  80                 // Give the GC a change at that weakref
  81                 if (i % 10 == 0) {
  82                     System.gc();
  83                     try {
  84                         Thread.sleep(100);
  85                     } catch (InterruptedException e) {
  86                         e.printStackTrace();
  87                     }
  88                 }
  89             }
  90         } catch (OutOfMemoryError e) {
  91             bigLeak = null;
  92             oome = true;
  93         }
  94         System.out.println("");
  95         if (!oome) {
  96             throw new RuntimeException("Problem with test case - never got OOME");
  97         }
  98         System.out.println("Got OOME");
  99     }
 100 }