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diff --git a/jdk/test/java/lang/management/RuntimeMXBean/UpTime.java b/jdk/test/java/lang/management/RuntimeMXBean/UpTime.java
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+/*
+ * Copyright 2003-2004 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 4530538
+ * @summary Basic unit test of RuntimeMXBean.getUptime()
+ * @author Alexei Guibadoulline
+ */
+
+import java.lang.management.*;
+
+public class UpTime {
+ final static long DELAY = 5; // Seconds
+ final static long TIMEOUT = 30; // Minutes
+ private static RuntimeMXBean metrics
+ = ManagementFactory.getRuntimeMXBean();
+
+ public static void main(String argv[]) throws Exception {
+ long systemStartOuter = System.currentTimeMillis();
+ long metricsStart = metrics.getUptime();
+ long systemStartInner = System.currentTimeMillis();
+
+ // If uptime is more than 30 minutes then it looks like a bug in
+ // the method
+ if (metricsStart > TIMEOUT * 60 * 1000)
+ throw new RuntimeException("Uptime of the JVM is more than 30 "
+ + "minutes ("
+ + (metricsStart / 60 / 1000)
+ + " minutes).");
+
+ // Wait for DELAY seconds
+ Object o = new Object();
+ while (System.currentTimeMillis() < systemStartInner + DELAY * 1000) {
+ synchronized (o) {
+ try {
+ o.wait(DELAY * 1000);
+ } catch (Exception e) {
+ e.printStackTrace();
+ throw e;
+ }
+ }
+ }
+
+ long systemEndInner = System.currentTimeMillis();
+ long metricsEnd = metrics.getUptime();
+ long systemEndOuter = System.currentTimeMillis();
+
+ long systemDifferenceInner = systemEndInner - systemStartInner;
+ long systemDifferenceOuter = systemEndOuter - systemStartOuter;
+ long metricsDifference = metricsEnd - metricsStart;
+
+ // Check the flow of time in RuntimeMXBean.getUptime(). See the
+ // picture below
+ if (metricsDifference < systemDifferenceInner)
+ throw new RuntimeException("Flow of the time in "
+ + "RuntimeMXBean.getUptime() ("
+ + metricsDifference + ") is slower than "
+ + " in system (" + systemDifferenceInner
+ + ")");
+ if (metricsDifference > systemDifferenceOuter)
+ throw new RuntimeException("Flow of the time in "
+ + "RuntimeMXBean.getUptime() ("
+ + metricsDifference + ") is faster than "
+ + "in system (" + systemDifferenceOuter
+ + ")");
+
+ System.out.println("Test passed.");
+ }
+}
+
+/*
+
+ A picture to describe the second testcase that checks the flow of time in
+ RuntimeMXBean.getUptime()
+
+
+ start
+ o1 u1 i1 Sleep for DELAY minutes i2 u2 o2
+ |-------|---|---|--------------------------------|---|---|---------------> time
+
+
+ The following inequality (checked by the test) must always be true:
+
+ o2-o1 >= u2-u1 >= i2-i1
+
+ In the test:
+
+ i1 - systemStartInner
+ i2 - systemEndInner
+ o1 - systemStartOuter
+ o2 - systemEndOuter
+ u1 - metricsStart
+ u2 - metricsEnd
+
+*/