test/jdk/java/io/Serializable/classDescHooks/Loopback.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) 2001, 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 4461299
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 * @summary Verify that serialization functions properly if
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 *          ObjectInputStream.readClassDescriptor() returns a local class
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 *          descriptor for which the serialVersionUID has not yet been
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 *          calculated.
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 */
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import java.io.*;
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import java.util.*;
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class LoopbackOutputStream extends ObjectOutputStream {
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    LinkedList<ObjectStreamClass> descs;
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    LoopbackOutputStream(OutputStream out, LinkedList<ObjectStreamClass> descs)
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        throws IOException
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    {
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        super(out);
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        this.descs = descs;
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    }
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    protected void writeClassDescriptor(ObjectStreamClass desc)
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        throws IOException
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    {
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        descs.add(desc);
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    }
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}
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class LoopbackInputStream extends ObjectInputStream {
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    LinkedList<ObjectStreamClass> descs;
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    LoopbackInputStream(InputStream in, LinkedList<ObjectStreamClass> descs) throws IOException {
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        super(in);
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        this.descs = descs;
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    }
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    protected ObjectStreamClass readClassDescriptor()
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    {
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        return descs.removeFirst();
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    }
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}
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public class Loopback implements Serializable {
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    private static final long serialVersionUID = 1L;
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    String str;
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    Loopback(String str) {
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        this.str = str;
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    }
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    public static void main(String[] args) throws Exception {
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        Loopback lb = new Loopback("foo");
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        LinkedList<ObjectStreamClass> descs = new LinkedList<>();
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        ByteArrayOutputStream bout = new ByteArrayOutputStream();
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        LoopbackOutputStream lout = new LoopbackOutputStream(bout, descs);
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        lout.writeObject(lb);
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        lout.close();
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        LoopbackInputStream lin = new LoopbackInputStream(
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            new ByteArrayInputStream(bout.toByteArray()), descs);
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        Loopback lbcopy = (Loopback) lin.readObject();
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        if (!lb.str.equals(lbcopy.str)) {
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            throw new Error();
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        }
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    }
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}