--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/cds/appcds/sharedStrings/LockStringValueTest.java Mon Jul 29 10:34:20 2019 -0400
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2015, 2019, 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");
+ }
+ }
+}