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Java example source code file (UnrecognizedRefType.java)

This example Java source code file (UnrecognizedRefType.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

bytearrayinputstream, bytearrayoutputstream, classnotfoundexception, failed, fakeremoteobject, fakeremoteref, marshalinputstream, object, objectinputstream, objectoutputstream, reflection, rmi, string, test, unrecognizedreftype, unsupportedoperationexception

The UnrecognizedRefType.java Java example source code

/*
 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/* @test
 * @bug 4460983
 * @summary This test verifies that when a RemoteObject is being
 * deserialized, if the "external ref type name" is a non-empty
 * string that is not equal to one of the external ref type names
 * required to be supported by the specification, then a
 * ClassNotFoundException is thrown.  Of particular note, with the
 * specification change for 4460983, "ActivatableServerRef" is no
 * longer a supported "external ref type name", and the names of
 * other classes in the internal package sun.rmi.server should
 * produce the same result.
 * See also test/java/rmi/activation/Activatable/notSerializable.
 * @author Peter Jones
 *
 * @run main/othervm UnrecognizedRefType
 */

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.lang.reflect.Method;
import java.rmi.Remote;
import java.rmi.server.Operation;
import java.rmi.server.RemoteCall;
import java.rmi.server.RemoteObject;
import java.rmi.server.RemoteRef;

public class UnrecognizedRefType {
    public static void main(String[] args) throws Exception {
        System.err.println("\nRegression test for bug 4460983\n");

        test(new FakeRemoteObject("ActivatableServerRef"));
        test(new FakeRemoteObject("MarshalInputStream"));
        test(new FakeRemoteObject("XXX"));

        System.err.println("TEST PASSED");
    }

    private static void test(RemoteObject obj) throws Exception {
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(bout);
        out.writeObject(obj);
        ByteArrayInputStream bin =
            new ByteArrayInputStream(bout.toByteArray());
        ObjectInputStream in = new ObjectInputStream(bin);
        try {
            Object obj2 = in.readObject();
            System.err.println(
                "Object unexpectedly deserialized successfully: " + obj2);
            throw new RuntimeException(
                "TEST FAILED: object successfully deserialized");
        } catch (ClassNotFoundException e) {
            System.err.println("ClassNotFoundException as expected:");
            e.printStackTrace();
        } // other exceptions cause test failure
    }

    private static class FakeRemoteObject extends RemoteObject {
        FakeRemoteObject(String refType) {
            super(new FakeRemoteRef(refType));
        }
    }

    private static class FakeRemoteRef implements RemoteRef {
        private final String refType;

        FakeRemoteRef(String refType) {
            this.refType = refType;
        }

        public Object invoke(Remote obj,
                             Method method,
                             Object[] params,
                             long opnum)
        {
            throw new UnsupportedOperationException();
        }

        public RemoteCall newCall(RemoteObject obj,
                                  Operation[] op,
                                  int opnum,
                                  long hash)
        {
            throw new UnsupportedOperationException();
        }

        public void invoke(RemoteCall call) {
            throw new UnsupportedOperationException();
        }

        public void done(RemoteCall call) {
            throw new UnsupportedOperationException();
        }

        public String getRefClass(java.io.ObjectOutput out) {
            return refType;
        }

        public int remoteHashCode() { return hashCode(); }
        public boolean remoteEquals(RemoteRef obj) { return equals(obj); }
        public String remoteToString() { return toString(); }

        public void readExternal(ObjectInput in) {
            throw new UnsupportedOperationException();
        }

        public void writeExternal(ObjectOutput out) {
            // no data to write
        }
    }
}

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