--- a/langtools/src/share/classes/com/sun/tools/javadoc/ClassDocImpl.java	Mon Oct 18 19:14:36 2010 +0100
+++ b/langtools/src/share/classes/com/sun/tools/javadoc/ClassDocImpl.java	Tue Oct 19 11:47:17 2010 +0530
@@ -850,6 +850,12 @@
                                        String[] paramTypes, Set<ClassDocImpl> searched) {
         //### Note that this search is not necessarily what the compiler would do!
 
+        Names names = tsym.name.table.names;
+        // do not match constructors
+        if (names.init.contentEquals(methodName)) {
+            return null;
+        }
+
         ClassDocImpl cdi;
         MethodDocImpl mdi;
 
@@ -876,7 +882,6 @@
          *---------------------------------*/
 
         // search current class
-        Names names = tsym.name.table.names;
         Scope.Entry e = tsym.members().lookup(names.fromString(methodName));
 
         //### Using modifier filter here isn't really correct,

--- a/langtools/src/share/classes/com/sun/tools/javadoc/DocEnv.java	Mon Oct 18 19:14:36 2010 +0100
+++ b/langtools/src/share/classes/com/sun/tools/javadoc/DocEnv.java	Tue Oct 19 11:47:17 2010 +0530
@@ -637,6 +637,7 @@
      * Should be called only on symbols representing methods.
      */
     public MethodDocImpl getMethodDoc(MethodSymbol meth) {
+        assert !meth.isConstructor() : "not expecting a constructor symbol";
         MethodDocImpl result = (MethodDocImpl)methodMap.get(meth);
         if (result != null) return result;
         result = new MethodDocImpl(this, meth);
@@ -665,6 +666,7 @@
      * Should be called only on symbols representing constructors.
      */
     public ConstructorDocImpl getConstructorDoc(MethodSymbol meth) {
+        assert meth.isConstructor() : "expecting a constructor symbol";
         ConstructorDocImpl result = (ConstructorDocImpl)methodMap.get(meth);
         if (result != null) return result;
         result = new ConstructorDocImpl(this, meth);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javadoc/T6551367.java	Tue Oct 19 11:47:17 2010 +0530
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2010, 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     6551367
+ * @summary javadoc throws ClassCastException when an link tag tries to reference constructor.
+ * @author  A. Sundararajan
+ * @run main T6551367 T6551367.java
+ */
+
+import com.sun.javadoc.*;
+import java.io.File;
+import static com.sun.tools.javadoc.Main.execute;
+
+public class T6551367 extends com.sun.tools.doclets.standard.Standard {
+    public T6551367() {}
+
+    /** Here, in the javadoc for this method, I try to link to
+     *  {@link #<init> a constructor}.
+     */
+    public static void main(String... args) {
+        File testSrc = new File(System.getProperty("test.src", "."));
+        File destDir = new File(System.getProperty("user.dir", "."));
+        for (String file : args) {
+            File source = new File(testSrc, file);
+            int rc = execute("javadoc", "T6551367",
+              T6551367.class.getClassLoader(),
+              new String[]{source.getPath(), "-d", destDir.getAbsolutePath()});
+            if (rc != 0)
+                throw new Error("unexpected exit from javadoc: " + rc);
+        }
+    }
+}