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