diff -r 000000000000 -r 373ffda63c9a src/share/jaxws_classes/com/sun/xml/internal/ws/model/wsdl/AbstractExtensibleImpl.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/jaxws_classes/com/sun/xml/internal/ws/model/wsdl/AbstractExtensibleImpl.java	Wed Apr 27 01:27:09 2016 +0800
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 1997, 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.xml.internal.ws.model.wsdl;
+
+import com.sun.xml.internal.ws.api.model.wsdl.WSDLExtensible;
+import com.sun.xml.internal.ws.api.model.wsdl.WSDLExtension;
+import com.sun.xml.internal.ws.api.model.wsdl.WSDLObject;
+import com.sun.xml.internal.ws.resources.UtilMessages;
+import com.sun.istack.internal.NotNull;
+
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.namespace.QName;
+import javax.xml.ws.WebServiceException;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.xml.sax.Locator;
+
+/**
+ * All the WSDL 1.1 elements that are extensible should subclass from this abstract implementation of
+ * {@link WSDLExtensible} interface.
+ *
+ * @author Vivek Pandey
+ * @author Kohsuke Kawaguchi
+ */
+abstract class AbstractExtensibleImpl extends AbstractObjectImpl implements WSDLExtensible {
+    protected final Set<WSDLExtension> extensions = new HashSet<WSDLExtension>();
+    // this captures any wsdl extensions that are not understood by WSDLExtensionParsers
+    // and have wsdl:required=true
+    protected List<UnknownWSDLExtension> notUnderstoodExtensions =
+            new ArrayList<UnknownWSDLExtension>();
+
+    protected AbstractExtensibleImpl(XMLStreamReader xsr) {
+        super(xsr);
+    }
+
+    protected AbstractExtensibleImpl(String systemId, int lineNumber) {
+        super(systemId, lineNumber);
+    }
+
+    public final Iterable<WSDLExtension> getExtensions() {
+        return extensions;
+    }
+
+    public final <T extends WSDLExtension> Iterable<T> getExtensions(Class<T> type) {
+        // TODO: this is a rather stupid implementation
+        List<T> r = new ArrayList<T>(extensions.size());
+        for (WSDLExtension e : extensions) {
+            if(type.isInstance(e))
+                r.add(type.cast(e));
+        }
+        return r;
+    }
+
+    public <T extends WSDLExtension> T getExtension(Class<T> type) {
+        for (WSDLExtension e : extensions) {
+            if(type.isInstance(e))
+                return type.cast(e);
+        }
+        return null;
+    }
+
+    public void addExtension(WSDLExtension ex) {
+        if(ex==null)
+            // I don't trust plugins. So let's always check it, instead of making this an assertion
+            throw new IllegalArgumentException();
+        extensions.add(ex);
+    }
+
+    public List<? extends UnknownWSDLExtension> getNotUnderstoodExtensions() {
+        return notUnderstoodExtensions;
+    }
+
+    /**
+     * This can be used if a WSDL extension element that has wsdl:required=true
+     * is not understood
+     * @param extnEl
+     * @param locator
+     */
+    public void addNotUnderstoodExtension(QName extnEl, Locator locator) {
+        notUnderstoodExtensions.add(new UnknownWSDLExtension(extnEl, locator));
+    }
+
+    protected static class UnknownWSDLExtension implements WSDLExtension, WSDLObject {
+        private final QName extnEl;
+        private final Locator locator;
+        public UnknownWSDLExtension(QName extnEl, Locator locator) {
+            this.extnEl = extnEl;
+            this.locator = locator;
+        }
+        public QName getName() {
+            return extnEl;
+        }
+        @NotNull public Locator getLocation() {
+            return locator;
+        }
+        public String toString(){
+           return extnEl + " "+ UtilMessages.UTIL_LOCATION( locator.getLineNumber(), locator.getSystemId());
+       }
+    }
+
+    /**
+     * This method should be called after freezing the WSDLModel
+     * @return true if all wsdl required extensions on Port and Binding are understood
+     */
+    public boolean areRequiredExtensionsUnderstood() {
+        if (notUnderstoodExtensions.size() != 0) {
+            StringBuilder buf = new StringBuilder("Unknown WSDL extensibility elements:");
+            for (UnknownWSDLExtension extn : notUnderstoodExtensions)
+                buf.append('\n').append(extn.toString());
+            throw new WebServiceException(buf.toString());
+        }
+        return true;
+    }
+}