diff -r 000000000000 -r 959103a6100f src/share/classes/com/sun/tools/javadoc/api/JavadocTool.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/classes/com/sun/tools/javadoc/api/JavadocTool.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2012, 2013, 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 com.sun.tools.javadoc.api;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.io.Writer;
+import java.nio.charset.Charset;
+import java.util.Collections;
+import java.util.EnumSet;
+import java.util.Locale;
+import java.util.Set;
+
+import javax.lang.model.SourceVersion;
+import javax.tools.DiagnosticListener;
+import javax.tools.DocumentationTool;
+import javax.tools.JavaFileManager;
+import javax.tools.JavaFileObject;
+import javax.tools.StandardJavaFileManager;
+
+import com.sun.tools.javac.api.ClientCodeWrapper;
+import com.sun.tools.javac.file.JavacFileManager;
+import com.sun.tools.javac.util.ClientCodeException;
+import com.sun.tools.javac.util.Context;
+import com.sun.tools.javac.util.Log;
+import com.sun.tools.javadoc.ToolOption;
+
+/**
+ * Provides access to functionality specific to the JDK documentation tool,
+ * javadoc.
+ *
+ * <p><b>This is NOT part of any supported API.
+ * If you write code that depends on this, you do so at your own
+ * risk.  This code and its internal interfaces are subject to change
+ * or deletion without notice.</b></p>
+ */
+public class JavadocTool implements DocumentationTool {
+    @Override
+    public DocumentationTask getTask(
+            Writer out,
+            JavaFileManager fileManager,
+            DiagnosticListener<? super JavaFileObject> diagnosticListener,
+            Class<?> docletClass,
+            Iterable<String> options,
+            Iterable<? extends JavaFileObject> compilationUnits) {
+        Context context = new Context();
+        return getTask(out, fileManager, diagnosticListener,
+                docletClass, options, compilationUnits, context);
+    }
+
+    public DocumentationTask getTask(
+            Writer out,
+            JavaFileManager fileManager,
+            DiagnosticListener<? super JavaFileObject> diagnosticListener,
+            Class<?> docletClass,
+            Iterable<String> options,
+            Iterable<? extends JavaFileObject> compilationUnits,
+            Context context) {
+        try {
+            ClientCodeWrapper ccw = ClientCodeWrapper.instance(context);
+
+            if (options != null) {
+                for (String option : options)
+                    option.getClass(); // null check
+            }
+
+            if (compilationUnits != null) {
+                compilationUnits = ccw.wrapJavaFileObjects(compilationUnits); // implicit null check
+                for (JavaFileObject cu : compilationUnits) {
+                    if (cu.getKind() != JavaFileObject.Kind.SOURCE) {
+                        final String kindMsg = "All compilation units must be of SOURCE kind";
+                        throw new IllegalArgumentException(kindMsg);
+                    }
+                }
+            }
+
+            if (diagnosticListener != null)
+                context.put(DiagnosticListener.class, ccw.wrap(diagnosticListener));
+
+            if (out == null)
+                context.put(Log.outKey, new PrintWriter(System.err, true));
+            else if (out instanceof PrintWriter)
+                context.put(Log.outKey, ((PrintWriter) out));
+            else
+                context.put(Log.outKey, new PrintWriter(out, true));
+
+            if (fileManager == null)
+                fileManager = getStandardFileManager(diagnosticListener, null, null);
+            fileManager = ccw.wrap(fileManager);
+            context.put(JavaFileManager.class, fileManager);
+
+            return new JavadocTaskImpl(context, docletClass, options, compilationUnits);
+        } catch (ClientCodeException ex) {
+            throw new RuntimeException(ex.getCause());
+        }
+    }
+
+    // TODO: used shared static method in JavacFileManager
+    @Override
+    public StandardJavaFileManager getStandardFileManager(
+            DiagnosticListener<? super JavaFileObject> diagnosticListener,
+            Locale locale,
+            Charset charset) {
+        Context context = new Context();
+        context.put(Locale.class, locale);
+        if (diagnosticListener != null)
+            context.put(DiagnosticListener.class, diagnosticListener);
+        PrintWriter pw = (charset == null)
+                ? new PrintWriter(System.err, true)
+                : new PrintWriter(new OutputStreamWriter(System.err, charset), true);
+        context.put(Log.outKey, pw);
+        return new JavacFileManager(context, true, charset);
+    }
+
+    @Override
+    public int run(InputStream in, OutputStream out, OutputStream err, String... arguments) {
+        PrintWriter err_pw = new PrintWriter(err == null ? System.err : err, true);
+        PrintWriter out_pw = new PrintWriter(out == null ? System.out : out);
+        try {
+            String standardDocletName = "com.sun.tools.doclets.standard.Standard";
+            ClassLoader cl = getClass().getClassLoader();
+            return com.sun.tools.javadoc.Main.execute(
+                    "javadoc", err_pw, err_pw, out_pw, standardDocletName, cl, arguments);
+        } finally {
+            err_pw.flush();
+            out_pw.flush();
+        }
+    }
+
+    @Override
+    public Set<SourceVersion> getSourceVersions() {
+        return Collections.unmodifiableSet(
+                EnumSet.range(SourceVersion.RELEASE_3, SourceVersion.latest()));
+    }
+
+    @Override
+    public int isSupportedOption(String option) {
+        if (option == null)
+            throw new NullPointerException();
+        for (ToolOption o: ToolOption.values()) {
+            if (o.opt.equals(option))
+                return o.hasArg ? 1 : 0;
+        }
+        return -1;
+    }
+
+}