--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/management/OperatingSystemMXBean/PlatformMXBeanTest.java	Thu Apr 10 10:47:13 2008 -0700
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug     6610094
+ * @summary Test the OperatingSystemMXBean instance returned by
+ *          ManagementFactory.getPlatformMXBeans()
+ * @author  Mandy Chung
+ *
+ * @run main PlatformMXBeanTest
+ */
+
+import java.lang.management.*;
+import java.util.List;
+
+public class PlatformMXBeanTest {
+    public static void main(String[] argv) throws Exception {
+        OperatingSystemMXBean osMBean = getOSPlatformMXBean(OperatingSystemMXBean.class);
+
+        // There should have only one single MXBean for the OS MXBean interfaces:
+        //   java.lang.management.OperatingSystemMXBean
+        //   com.sun.management.OperatingSystemMXBean
+        //   com.sun.management.UnixOperatingSystemMXBean
+        if (osMBean != getOSPlatformMXBean(com.sun.management.OperatingSystemMXBean.class)) {
+            throw new RuntimeException(
+                "Invalid com.sun.management.OperatingSystemMXBean instance");
+        }
+
+        if (!System.getProperty("os.name").startsWith("Windows") &&
+                osMBean != getOSPlatformMXBean(com.sun.management.UnixOperatingSystemMXBean.class)) {
+            throw new RuntimeException(
+                "Invalid com.sun.management.UnixOperatingSystemMXBean instance");
+        }
+    }
+
+    private static <T extends OperatingSystemMXBean>
+            T getOSPlatformMXBean(Class<T> c) {
+        List<T> result = ManagementFactory.getPlatformMXBeans(c);
+        if (result.isEmpty()) {
+            return null;
+        } else if (result.size() == 1) {
+            return result.get(0);
+        } else {
+            throw new RuntimeException(c.getName() + " has " +
+                result.size() + " number of instances");
+        }
+    }
+}