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