PinLastArguments.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.
 *
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 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/* @test
 * @bug 6332349
 * @summary Passing live remote references as part of the arguments of
 * a remote invocation should not cause an AssertionError (on the
 * second and subsequent attempts) when system assertions are enabled,
 * nor should it cause the references to be pinned until a subsequent
 * such remote invocation occurs (if the argument stream was not
 * released cleanly because of a marshalling failure).
 * @author Peter Jones
 *
 * @run main/othervm -esa PinLastArguments
 */

import java.io.NotSerializableException;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.rmi.MarshalException;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class PinLastArguments {

    public interface Ping extends Remote {
        void ping(Object first, Object second) throws RemoteException;
    }

    private static class PingImpl implements Ping {
        PingImpl() { }
        public void ping(Object first, Object second) {
            System.err.println("ping invoked: " + first + ", " + second);
        }
    }

    public static void main(String[] args) throws Exception {
        System.err.println("\nRegression test for bug 6332349\n");

        Ping impl = new PingImpl();
        Reference<?> ref = new WeakReference<Ping>(impl);
        try {
            Ping stub = (Ping) UnicastRemoteObject.exportObject(impl, 0);
            Object notSerializable = new Object();
            stub.ping(impl, null);
            try {
                stub.ping(impl, notSerializable);
            } catch (MarshalException e) {
                if (e.getCause() instanceof NotSerializableException) {
                    System.err.println("ping invocation failed as expected");
                } else {
                    throw e;
                }
            }
        } finally {
            UnicastRemoteObject.unexportObject(impl, true);
        }
        impl = null;

        // Might require multiple calls to System.gc() for weak-references
        // processing to be complete. If the weak-reference is not cleared as
        // expected we will hang here until timed out by the test harness.
        while (true) {
            System.gc();
            Thread.sleep(20);
            if (ref.get() == null) {
                break;
            }
        }

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