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 /* @test 25 * @bug 4332184 26 * @summary Ensure that ObjectOutputStream properly releases strong references 27 * to written objects when reset() is called. 28 */ 29 30 import java.io.*; 31 import java.lang.ref.WeakReference; 32 import java.util.ArrayList; 33 34 public class ClearHandleTable { 35 public static void main(String[] args) throws Exception { 36 final int nreps = 100; 37 ObjectOutputStream oout = 38 new ObjectOutputStream(new ByteArrayOutputStream()); 39 WeakReference[] refs = new WeakReference[nreps]; 40 41 for (int i = 0; i < nreps; i++) { 42 String str = new String("blargh"); 43 oout.writeObject(str); 44 refs[i] = new WeakReference(str); 45 } 46 47 oout.reset(); 48 exhaustMemory(); 49 50 for (int i = 0; i < nreps; i++) { 51 if (refs[i].get() != null) { 52 throw new Error("failed to garbage collect object " + i); 53 } 54 } 55 } 56 57 static void exhaustMemory() { 58 ArrayList blob = new ArrayList(); 59 try { 60 for (;;) { 61 blob.add(new int[0xFFFF]); 62 } 63 } catch (OutOfMemoryError e) { 64 } 65 } 66 } --- EOF ---