--- /dev/null	2016-05-17 12:01:17.473251102 +0900
+++ new/test/java/text/Format/DateFormat/Bug6335238.java	2016-05-26 10:32:08.374634674 +0900
@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 2006, 2016, 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.
+ */
+
+/*
+ * @test 1.1 06/01/24
+ * @bug 6335238
+ * @summary Make sure that both the original and cloned SimpleDateFormat coexistindependently and don't cut off each other.
+ * @run main Bug6335238 10
+ */
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+import java.util.TimeZone;
+
+// Usage: java Bug6335238 [duration]
+public class Bug6335238 {
+
+    static final long UTC_LONG = 974534460000L;
+    static final String TIME_STRING = "2000/11/18 00:01:00";
+    static SimpleDateFormat masterSdf;
+    static int duration = 180;
+    static boolean stopped = false;
+    static boolean err = false;
+
+    public static void main(String[] args) {
+        if (args.length == 1) {
+            duration = Math.max(10, Integer.parseInt(args[0]));
+        }
+        Locale savedLocale = Locale.getDefault();
+        TimeZone savedTimeZone = TimeZone.getDefault();
+
+        TimeZone.setDefault(TimeZone.getTimeZone("US/Pacific"));
+        Locale.setDefault(Locale.US);
+
+        masterSdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
+
+        try {
+            // Once it is used, DecimalFormat becomes not thread-safe.
+            Date d = masterSdf.parse(TIME_STRING);
+
+            new Bug6335238();
+        } catch (Exception e) {
+            System.err.println(e);
+            err = true;
+        } finally {
+            TimeZone.setDefault(savedTimeZone);
+            Locale.setDefault(savedLocale);
+
+            if (err) {
+                throw new RuntimeException("Failed: Multiple DateFormat instances didn't work correctly.");
+            } else {
+                System.out.println("Passed.");
+            }
+        }
+    }
+
+    public Bug6335238() {
+        stopped = false;
+
+        DateParseThread d1 = new DateParseThread();
+        DateFormatThread d2 = new DateFormatThread();
+        DateParseThread d3 = new DateParseThread();
+        DateFormatThread d4 = new DateFormatThread();
+
+        d1.start();
+        d2.start();
+        d3.start();
+        d4.start();
+
+        try {
+            Thread.sleep(duration * 1000);
+        }
+        catch (Exception e) {
+            System.err.println(e);
+            err = true;
+        }
+
+        stopped = true;
+    }
+
+    class DateFormatThread extends Thread {
+
+        public void run() {
+            int i = 0;
+
+            while (!stopped) {
+                SimpleDateFormat sdf;
+                synchronized (masterSdf) {
+                    sdf = (SimpleDateFormat)masterSdf.clone();
+                }
+
+                i++;
+                String s = sdf.format(new Date(UTC_LONG));
+
+                if (!s.equals(TIME_STRING)) {
+                    stopped = true;
+                    err = true;
+
+                    throw new RuntimeException("Formatting Date Error: counter=" +
+                        i + ", Got<" + s + "> != Expected<" + TIME_STRING + ">");
+                }
+            }
+        }
+    }
+
+    class DateParseThread extends Thread {
+
+        public void run() {
+            int i = 0;
+
+            while (!stopped) {
+                SimpleDateFormat sdf;
+                synchronized (masterSdf) {
+                    sdf = (SimpleDateFormat)masterSdf.clone();
+                }
+
+                i++;
+                Date date;
+                try {
+                    date = sdf.parse(TIME_STRING);
+                    long t = date.getTime();
+
+                    if (t != UTC_LONG) {
+                        stopped = true;
+                        err = true;
+
+                        throw new RuntimeException("Parsing Date Error: counter=" +
+                            i + " Got:" + t + "<" + sdf.format(date) +
+                            "> != " + UTC_LONG);
+                    }
+                }
+                catch (ParseException e) {
+                    stopped = true;
+                    err = true;
+
+                    throw new RuntimeException(e);
+                }
+            }
+        }
+    }
+}