diff -r 000000000000 -r 373ffda63c9a src/share/jaxws_classes/com/sun/xml/internal/bind/v2/util/TypeCast.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/jaxws_classes/com/sun/xml/internal/bind/v2/util/TypeCast.java	Wed Apr 27 01:27:09 2016 +0800
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 1997, 2011, 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.xml.internal.bind.v2.util;
+
+import java.util.Map;
+
+/**
+ * @author Kohsuke Kawaguchi
+ */
+public class TypeCast {
+    /**
+     * Makes sure that a map contains the right type, and returns it to the desirable type.
+     */
+    public static <K,V> Map<K,V> checkedCast( Map<?,?> m, Class<K> keyType, Class<V> valueType ) {
+        if(m==null)
+            return null;
+        for (Map.Entry e : m.entrySet()) {
+            if(!keyType.isInstance(e.getKey()))
+                throw new ClassCastException(e.getKey().getClass().toString());
+            if(!valueType.isInstance(e.getValue()))
+                throw new ClassCastException(e.getValue().getClass().toString());
+        }
+        return (Map<K,V>)m;
+    }
+}