CNFException.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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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/* @test
 * @bug 4931314
 * @summary Verify that a ClassNotFoundException thrown by the
 *          readClassDescriptor method is reflected to the caller as an
 *          InvalidClassException with the ClassNotFoundException as its cause.
 */

import java.io.*;

class CNFInputStream extends ObjectInputStream {

    CNFInputStream(InputStream in) throws IOException {
        super(in);
    }

    protected ObjectStreamClass readClassDescriptor()
        throws IOException, ClassNotFoundException
    {
        throw new ClassNotFoundException("foobar");
    }
}

public class CNFException {
    public static void main(String[] args) throws Exception {
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream oout = new ObjectOutputStream(bout);
        oout.writeObject(5);
        oout.close();
        ObjectInputStream oin =
            new CNFInputStream(new ByteArrayInputStream(bout.toByteArray()));
        try {
            oin.readObject();
            throw new Error("expected InvalidClassException");
        } catch (InvalidClassException e) {
            Throwable cause = e.getCause();
            if (!(cause instanceof ClassNotFoundException)) {
                throw new Error(
                    "expected ClassNotFoundException as cause, not " + cause);
            }
        }
    }
}