diff -r 000000000000 -r 373ffda63c9a src/share/jaxws_classes/com/sun/xml/internal/bind/v2/runtime/unmarshaller/DefaultValueLoaderDecorator.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/jaxws_classes/com/sun/xml/internal/bind/v2/runtime/unmarshaller/DefaultValueLoaderDecorator.java	Wed Apr 27 01:27:09 2016 +0800
@@ -0,0 +1,53 @@
+/*
+ * 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.runtime.unmarshaller;
+
+import org.xml.sax.SAXException;
+
+/**
+ * Decorates another {@link Loader} by setting a default value.
+ *
+ * @author Kohsuke Kawaguchi
+ */
+public final class DefaultValueLoaderDecorator extends Loader {
+    private final Loader l;
+    private final String defaultValue;
+
+    public DefaultValueLoaderDecorator(Loader l, String defaultValue) {
+        this.l = l;
+        this.defaultValue = defaultValue;
+    }
+
+    @Override
+    public void startElement(UnmarshallingContext.State state, TagName ea) throws SAXException {
+        // install the default value, but don't override the one given by the parent loader
+        if(state.elementDefaultValue==null)
+            state.elementDefaultValue = defaultValue;
+
+        state.loader = l;
+        l.startElement(state,ea);
+    }
+}