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 /*
  25  * @bug 4311991
  26  * @summary Test ObjectOutputStream.writeUnshared/readUnshared functionality.
  27  */
  28 
  29 import java.io.*;
  30 
  31 class Bar implements Serializable {
  32     private static final long serialVersionUID = 0L;
  33     private static final ObjectStreamField[] serialPersistentFields =
  34         new ObjectStreamField[] {
  35             new ObjectStreamField("obj", Object.class, true)
  36         };
  37     Object obj;
  38 
  39     Bar(Object obj) {
  40         this.obj = obj;
  41     }
  42 }
  43 
  44 public class Read {
  45     public static void main(String[] args) throws Exception {
  46         String str = "foo";
  47         ByteArrayOutputStream bout = new ByteArrayOutputStream();
  48         ObjectOutputStream oout = new ObjectOutputStream(bout);
  49 
  50         oout.writeObject(str);
  51         oout.writeObject(str);
  52         oout.close();
  53 
  54         byte[] buf = bout.toByteArray();
  55         ByteArrayInputStream bin = new ByteArrayInputStream(buf);
  56         ObjectInputStream oin = new ObjectInputStream(bin);
  57         oin.readUnshared();
  58         try {
  59             oin.readObject();
  60             throw new Error();
  61         } catch (ObjectStreamException ex) {
  62         }
  63 
  64         bin = new ByteArrayInputStream(buf);
  65         oin = new ObjectInputStream(bin);
  66         oin.readUnshared();
  67         try {
  68             oin.readUnshared();
  69             throw new Error();
  70         } catch (ObjectStreamException ex) {
  71         }
  72 
  73         bin = new ByteArrayInputStream(buf);
  74         oin = new ObjectInputStream(bin);
  75         oin.readObject();
  76         try {
  77             oin.readUnshared();
  78             throw new Error();
  79         } catch (ObjectStreamException ex) {
  80         }
  81 
  82         // read in objects written by Write.main()
  83         FileInputStream in = new FileInputStream("tmp.ser");
  84         try {
  85             oin = new ObjectInputStream(in);
  86             oin.readObject();
  87             try {
  88                 oin.readObject();
  89                 throw new Error();
  90             } catch (ObjectStreamException ex) {
  91             }
  92         } finally {
  93             in.close();
  94         }
  95 
  96         in = new FileInputStream("tmp.ser");
  97         try {
  98             oin = new ObjectInputStream(in);
  99             oin.readObject();
 100             try {
 101                 oin.readUnshared();
 102                 throw new Error();
 103             } catch (ObjectStreamException ex) {
 104             }
 105         } finally {
 106             in.close();
 107         }
 108     }
 109 }