/*

 * Copyright (c) 2015, 2017, 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.

 *

 */

import java.lang.reflect.*;

import sun.hotspot.WhiteBox;

/*

 * Lock the 'value' field of a known shared string, java.lang.Object

 */

public class LockStringValueTest {

    public static void main(String args[]) {

        String s = "LiveOak";

        WhiteBox wb = WhiteBox.getWhiteBox();

        if (wb.areSharedStringsIgnored()) {

            System.out.println("The shared strings are ignored");

            System.out.println("LockStringValueTest: PASS");

            return;

        }

        if (!wb.isShared(s)) {

            throw new RuntimeException("LockStringValueTest Failed: String is not shared.");

        }

        Class c = s.getClass();

        try {

            Field f = c.getDeclaredField("value");

            f.setAccessible(true);

            Object v = f.get(s);

            lock(v);

        } catch (NoSuchFieldException nfe) {

        } catch (IllegalAccessException iae) {}

    }

    public static void lock(Object o) {

        synchronized (o) {

            System.out.println("LockStringValueTest: PASS");

        }

    }

}