ReadAddedSuperClass.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
 *
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 */

/*
 *  @bug 4070080
 *
 *  @build WriteAddedSuperClass ReadAddedSuperClass
 *  @run main ReadAddedSuperClass
 *  @summary Test reading an evolved class serialization into the original class
 *           version. Class evolved by adding a superclass.
 *           This is a compatible class evolution.
 *
 *  Part a of test serializes an instance of an evolved class to a serialization stream.
 *  Part b of test deserializes the serialization stream into an instance of
 *  the original class.
 *
 *  Description of failure:
 *
 *  If you delete AddedSuperClass.class before running this test,
 *  both JDK 1.1.x and 1.2 result in ClassNotFoundException for class
 *  AddedSuperClass.  If the .class file is not deleted, 1.2 does not
 *  fail. However, JDK 1.1.4 core dumps dereferencing a null class handle
 *  in the native method for inputClassDescriptor.
 */

import java.io.*;

class A implements Serializable {
    // Version 1.0 of class A.
    private static final long serialVersionUID = 1L;
}

public class ReadAddedSuperClass {
    public static void main(String args[]) throws IOException, ClassNotFoundException {
        File f = new File("tmp.ser");
        ObjectInput in =
            new ObjectInputStream(new FileInputStream(f));
        A a = (A)in.readObject();
        in.close();
    }
}