test/jdk/java/io/Serializable/verifyDynamicObjHandleTable/VerifyDynamicObjHandleTable.java
author rriggs
Fri, 11 Oct 2019 13:11:56 -0400
changeset 58565 baa5969ecf34
parent 47216 71c04702a3d5
permissions -rw-r--r--
8231427: Warning cleanup in tests of java.io.Serializable Reviewed-by: darcy, lancea
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/*
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 * Copyright (c) 1998, 2019, 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 4146453
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 * @summary Test that regrow of object/handle table of ObjectOutputStream works.
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 */
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import java.io.*;
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import java.util.HashSet;
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import java.util.Iterator;
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class A implements Serializable {
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    private static final long serialVersionUID = 1L;
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    static HashSet<A> writeObjectExtent = new HashSet<>();
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    private void writeObject(ObjectOutputStream out) throws IOException {
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        if (writeObjectExtent.contains(this)) {
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            throw new InvalidObjectException("writeObject: object " +
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                                             this.toString() + " has already "
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                                             + "been serialized and should " +
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                                             "have be serialized by reference.");
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        } else {
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            writeObjectExtent.add(this);
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        }
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        out.defaultWriteObject();
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    }
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    A() {
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    }
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}
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public class VerifyDynamicObjHandleTable {
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    public static void main(String args[])
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        throws IOException, ClassNotFoundException
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    {
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        ObjectOutputStream out =
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            new ObjectOutputStream(new ByteArrayOutputStream(3000));
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        for (int i = 0; i < 1000; i++) {
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            out.writeObject(new A());
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        }
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        // Make sure that serialization subsystem does not
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        // allow writeObject to be called on any objects that
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        // have already been serialized. These objects should be
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        // written out by reference.
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        Iterator<A> iter = A.writeObjectExtent.iterator();
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        while (iter.hasNext()) {
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            out.writeObject(iter.next());
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        }
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        out.close();
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    }
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}