1 /*
   2  * Copyright (c) 2000, 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 /* @test
  25  * @bug 4332184
  26  * @summary Ensure that ObjectOutputStream properly releases strong references
  27  *          to written objects when reset() is called.
  28  */
  29 
  30 import java.io.*;
  31 import java.lang.ref.WeakReference;
  32 import java.util.ArrayList;


  33 
  34 public class ClearHandleTable {


  35     public static void main(String[] args) throws Exception {
  36         final int nreps = 100;
  37         ObjectOutputStream oout =
  38             new ObjectOutputStream(new ByteArrayOutputStream());
  39         WeakReference[] refs = new WeakReference[nreps];
  40 
  41         for (int i = 0; i < nreps; i++) {
  42             String str = new String("blargh");
  43             oout.writeObject(str);
  44             refs[i] = new WeakReference(str);
  45         }
  46 
  47         oout.reset();
  48         exhaustMemory();
  49 
  50         for (int i = 0; i < nreps; i++) {
  51             if (refs[i].get() != null) {
  52                 throw new Error("failed to garbage collect object " + i);







  53             }
  54         }






  55     }
  56 
  57     static void exhaustMemory() {
  58         ArrayList blob = new ArrayList();
  59         try {
  60             for (;;) {
  61                 blob.add(new int[0xFFFF]);
  62             }
  63         } catch (OutOfMemoryError e) {
  64         }
  65     }
  66 }
--- EOF ---