diff -r 4ebc2e2fb97c -r 71c04702a3d5 test/langtools/tools/javadoc/6176978/T6176978.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javadoc/6176978/T6176978.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2008, 2015, 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
+ * @bug 6176978
+ * @summary current Javadoc's invocation and extension (Doclet) mechanisms are problematic
+ * @modules jdk.javadoc
+ * @build T6176978
+ * @run main T6176978
+ */
+
+import java.io.*;
+import java.net.*;
+
+public class T6176978
+{
+    public static void main(String[] args) throws Exception {
+        // create and use a temp dir that will not be on jtreg's
+        // default class path
+        File tmpDir = new File("tmp");
+        tmpDir.mkdirs();
+
+        File testSrc = new File(System.getProperty("test.src", "."));
+        String[] javac_args = {
+            "-d",
+            "tmp",
+            new File(testSrc, "X.java").getPath()
+        };
+
+        int rc = com.sun.tools.javac.Main.compile(javac_args);
+        if (rc != 0)
+            throw new Error("javac exit code: " + rc);
+
+        String[] jdoc_args = {
+            "-doclet",
+            "X",
+            new File(testSrc, "T6176978.java").getPath()
+        };
+
+        rc = com.sun.tools.javadoc.Main.execute(jdoc_args);
+        if (rc == 0)
+            throw new Error("javadoc unexpectedly succeeded");
+
+
+
+        Thread currThread = Thread.currentThread();
+        ClassLoader saveClassLoader = currThread.getContextClassLoader();
+        URLClassLoader urlCL = new URLClassLoader(new URL[] { tmpDir.toURL() });
+        currThread.setContextClassLoader(urlCL);
+
+        try {
+            rc = com.sun.tools.javadoc.Main.execute(jdoc_args);
+            if (rc != 0)
+                throw new Error("javadoc exit: " + rc);
+        }
+        finally {
+            currThread.setContextClassLoader(saveClassLoader);
+        }
+    }
+}