1/*
2 * Copyright (c) 1998, 2004, 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 * @clean A WriteObjectMemory
26 * @run main WriteObjectMemory
27 * @bug 4146453 5011410
28 * @summary Test that regrow of object/handle table of ObjectOutputStream works.
29 */
30
31import java.io.*;
32import java.util.HashSet;
33import java.util.Iterator;
34
35class A implements Serializable {
36    static HashSet writeObjectExtent = new HashSet();
37
38    private void writeObject(ObjectOutputStream out) throws IOException {
39        if (writeObjectExtent.contains(this)) {
40            throw new InvalidObjectException("writeObject: object " +
41                                             this.toString() + " has already "
42                                             + "been serialized and should " +
43                                             "have be serialized by reference.");
44        } else {
45            writeObjectExtent.add(this);
46        }
47        out.defaultWriteObject();
48    }
49
50    A() {
51    }
52}
53
54public class WriteObjectMemory {
55    public static void main(String args[])
56        throws IOException, ClassNotFoundException
57    {
58        ObjectOutputStream out =
59            new ObjectOutputStream(new ByteArrayOutputStream(3000));
60        for (int i = 0; i < 1000; i++) {
61            out.writeObject(new A());
62        }
63
64        // Make sure that serialization subsystem does not
65        // allow writeObject to be called on any objects that
66        // have already been serialized. These objects should be
67        // written out by reference.
68        Iterator iter = A.writeObjectExtent.iterator();
69        while (iter.hasNext()) {
70            out.writeObject(iter.next());
71        }
72
73        out.close();
74    }
75}
76