| /* |
| * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* @test |
| * @bug 4332184 |
| * @summary Ensure that ObjectOutputStream properly releases strong references |
| * to written objects when reset() is called. |
| */ |
| |
| import java.io.*; |
| import java.lang.ref.WeakReference; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| public class ClearHandleTable { |
| private static final int TIMES = 1000; |
| |
| public static void main(String[] args) throws Exception { |
| final int nreps = 100; |
| ObjectOutputStream oout = |
| new ObjectOutputStream(new ByteArrayOutputStream()); |
| List<WeakReference<?>> refs = new ArrayList<>(nreps); |
| |
| for (int i = 0; i < nreps; i++) { |
| String str = new String("blargh"); |
| oout.writeObject(str); |
| refs.add(new WeakReference<Object>(str)); |
| } |
| |
| oout.reset(); |
| |
| int count = 0; |
| for (int i=0; i<TIMES; i++) { |
| // relying on, possibly multiple, System.gc calls to clear weak references |
| System.gc(); |
| |
| Iterator<WeakReference<?>> itr = refs.iterator(); |
| while(itr.hasNext()) { |
| WeakReference<?> ref = itr.next(); |
| if (ref.get() == null) { |
| itr.remove(); |
| } |
| } |
| if (refs.isEmpty()) |
| break; |
| Thread.sleep(20); |
| count++; |
| if (count % 10 == 0) |
| System.out.println("Looping " + count + " times"); |
| } |
| |
| if (!refs.isEmpty()) { |
| throw new Error("failed to garbage collect object"); |
| } |
| } |
| } |