62 lines
2.1 KiB
Java
62 lines
2.1 KiB
Java
/*
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* Copyright (c) 2015, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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import java.lang.reflect.*;
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import sun.hotspot.WhiteBox;
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/*
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* Lock the 'value' field of a known shared string, java.lang.Object
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*/
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public class LockStringValueTest {
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public static void main(String args[]) {
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String s = "LiveOak";
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WhiteBox wb = WhiteBox.getWhiteBox();
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if (!wb.areSharedStringsMapped()) {
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System.out.println("The shared strings are not mapped");
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System.out.println("LockStringValueTest: PASS");
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return;
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}
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if (!wb.isSharedInternedString(s)) {
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throw new RuntimeException("LockStringValueTest Failed: String is not shared.");
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}
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Class c = s.getClass();
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try {
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Field f = c.getDeclaredField("value");
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f.setAccessible(true);
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Object v = f.get(s);
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lock(v);
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} catch (NoSuchFieldException nfe) {
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} catch (IllegalAccessException iae) {}
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}
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public static void lock(Object o) {
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synchronized (o) {
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System.out.println("LockStringValueTest: PASS");
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}
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}
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}
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