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