--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/src/share/classes/jdk/management/jfr/MBeanUtils.java	2019-01-29 11:00:25.222221152 +0800
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2016, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package jdk.management.jfr;
+
+import java.lang.management.ManagementPermission;
+import java.security.Permission;
+import java.time.DateTimeException;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.format.DateTimeParseException;
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import javax.management.MalformedObjectNameException;
+import javax.management.ObjectName;
+
+import jdk.jfr.internal.management.ManagementSupport;
+
+final class MBeanUtils {
+
+    private static final Permission monitor = new ManagementPermission("monitor");
+    private static final Permission control = new ManagementPermission("control");
+
+    static ObjectName createObjectName() {
+        try {
+            return new ObjectName(FlightRecorderMXBean.MXBEAN_NAME);
+        } catch (MalformedObjectNameException mne) {
+            throw new Error("Can't happen", mne);
+        }
+    }
+
+    static void checkControl() {
+        SecurityManager secManager = System.getSecurityManager();
+        if (secManager != null) {
+            secManager.checkPermission(control);
+        }
+    }
+
+    static void checkMonitor() {
+        SecurityManager secManager = System.getSecurityManager();
+        if (secManager != null) {
+            secManager.checkPermission(monitor);
+        }
+    }
+
+    static <T, R> List<R> transformList(List<T> source, Function<T, R> function) {
+        return source.stream().map(function).collect(Collectors.toList());
+    }
+
+    static boolean booleanValue(String s) {
+        if ("true".equals(s)) {
+            return true;
+        }
+        if ("false".equals(s)) {
+            return false;
+        }
+        throw new IllegalArgumentException("Value must be true or false.");
+    }
+
+    static Duration duration(String s) throws NumberFormatException {
+        if (s == null) {
+            return null;
+        }
+        long l = ManagementSupport.parseTimespan(s);
+        if (l == 0) {
+            return null;
+        }
+        return Duration.ofNanos(l);
+    }
+
+    public static Instant parseTimestamp(String s, Instant defaultValue) {
+        if (s == null) {
+            return defaultValue;
+        }
+        try {
+            return Instant.parse(s);
+        } catch(DateTimeParseException e ) {
+            // OK, try with milliseconds since epoch
+            // before giving up.
+        }
+        try {
+            return Instant.ofEpochMilli(Long.parseLong(s));
+        } catch (NumberFormatException | DateTimeException nfr) {
+            throw new IllegalArgumentException("Not a valid timestamp " + s);
+        }
+    }
+
+    static Long size(String s) throws NumberFormatException {
+        long size = Long.parseLong(s);
+        if (size < 0) {
+            throw new IllegalArgumentException("Negative size not allowed");
+        }
+        return size;
+    }
+
+    public static int parseBlockSize(String string, int defaultSize) {
+        if (string == null) {
+            return defaultSize;
+        }
+        int size = Integer.parseInt(string);
+        if (size <1)  {
+            throw new IllegalArgumentException("Block size msut be at least 1 byte");
+        }
+        return size;
+    }
+}
+