1 /*
   2  * Copyright (c) 1998, 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 4146453
  26  * @summary Test that regrow of object/handle table of ObjectOutputStream works.
  27  */
  28 
  29 import java.io.*;
  30 import java.util.HashSet;
  31 import java.util.Iterator;
  32 
  33 class A implements Serializable {
  34     static HashSet writeObjectExtent = new HashSet();
  35 
  36     private void writeObject(ObjectOutputStream out) throws IOException {
  37         if (writeObjectExtent.contains(this)) {
  38             throw new InvalidObjectException("writeObject: object " +
  39                                              this.toString() + " has already "
  40                                              + "been serialized and should " +
  41                                              "have be serialized by reference.");
  42         } else {
  43             writeObjectExtent.add(this);
  44         }
  45         out.defaultWriteObject();
  46     }
  47 
  48     A() {
  49     }
  50 }
  51 
  52 public class VerifyDynamicObjHandleTable {
  53     public static void main(String args[])
  54         throws IOException, ClassNotFoundException
  55     {
  56         ObjectOutputStream out =
  57             new ObjectOutputStream(new ByteArrayOutputStream(3000));
  58         for (int i = 0; i < 1000; i++) {
  59             out.writeObject(new A());
  60         }
  61 
  62         // Make sure that serialization subsystem does not
  63         // allow writeObject to be called on any objects that
  64         // have already been serialized. These objects should be
  65         // written out by reference.
  66         Iterator iter = A.writeObjectExtent.iterator();
  67         while (iter.hasNext()) {
  68             out.writeObject(iter.next());
  69         }
  70 
  71         out.close();
  72     }
  73 }