ajax4jsf: problème avec <a4j:include>

Le code provient d'un tutorial, tout allait bien avant que j'ajoute <a4j:include>.
La partie du code qui pose problème dans le fichier:

Code:

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<a4j:outputPanel id="tab" ajaxRendered="true">
  <a4j:include  viewId="employeeHeader.jsp"/>
</a4j:outputPanel>

et le web.xml

Code:

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<?xml version="1.0" encoding="UTF-8"?>
<!--
 * Copyright 2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
-->
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 <display-name>googlehousemyface</display-name>
 <context-param>
  <description>State saving method: "client" or "server" (= default)
            See JSF Specification 2.5.2</description>
  <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
  <param-value>client</param-value>
 </context-param>
 <context-param>
  <description>This parameter tells MyFaces if javascript code should be allowed in the
            rendered HTML output.
            If javascript is allowed, command_link anchors will have javascript code
            that submits the corresponding form.
            If javascript is not allowed, the state saving info and nested parameters
            will be added as url parameters.
            Default: "true"</description>
  <param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
  <param-value>true</param-value>
 </context-param>
 <context-param>
  <description>This parameter tells MyFaces if javascript code should be allowed in the
            rendered HTML output.
            If javascript is allowed, command_link anchors will have javascript code
            that submits the corresponding form.
            If javascript is not allowed, the state saving info and nested parameters
            will be added as url parameters.
            Default: "false"
 
            Setting this param to true should be combined with STATE_SAVING_METHOD "server" for
            best results.
 
            This is an EXPERIMENTAL feature. You also have to enable the detector filter/filter mapping below to get
            JavaScript detection working.</description>
  <param-name>org.apache.myfaces.DETECT_JAVASCRIPT</param-name>
  <param-value>false</param-value>
 </context-param>
 <context-param>
  <description>If true, rendered HTML code will be formatted, so that it is "human readable".
            i.e. additional line separators and whitespace will be written, that do not
            influence the HTML code.
            Default: "true"</description>
  <param-name>org.apache.myfaces.PRETTY_HTML</param-name>
  <param-value>true</param-value>
 </context-param>
 <context-param>
  <description>If true, a javascript function will be rendered that is able to restore the
            former vertical scroll on every request. Convenient feature if you have pages
            with long lists and you do not want the browser page to always jump to the top
            if you trigger a link or button action that stays on the same page.
            Default: "false"</description>
  <param-name>org.apache.myfaces.AUTO_SCROLL</param-name>
  <param-value>false</param-value>
 </context-param>
 
 <!--  
 <context-param>
  <param-name>javax.faces.application.CONFIG_FILES</param-name>
  <param-value>/WEB-INF/faces-config.xml,/WEB-INF/data-config.xml</param-value>
 </context-param>
 -->
 
 <context-param>
  <param-name>javax.faces.CONFIG_FILES</param-name>
  <param-value>/WEB-INF/faces-config.xml,/WEB-INF/data-config.xml</param-value>
 </context-param>
 
 
 <filter>
  <filter-name>extensionsFilter</filter-name>
  <filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter</filter-class>
  <init-param>
   <description>Set the size limit for uploaded files.
                Format: 10 - 10 bytes
                        10k - 10 KB
                        10m - 10 MB
                        1g - 1 GB</description>
   <param-name>uploadMaxFileSize</param-name>
   <param-value>100m</param-value>
  </init-param>
  <init-param>
   <description>Set the threshold size - files
                    below this limit are stored in memory, files above
                    this limit are stored on disk.
 
                Format: 10 - 10 bytes
                        10k - 10 KB
                        10m - 10 MB
                        1g - 1 GB</description>
   <param-name>uploadThresholdSize</param-name>
   <param-value>100k</param-value>
  </init-param>
  <!--        <init-param>
            <param-name>uploadRepositoryPath</param-name>
            <param-value>/temp</param-value>
            <description>Set the path where the intermediary files will be stored.
            </description>
        </init-param>-->
 </filter>
 
 <!-- jajx4jsf config -->
 <context-param>
  <param-name>org.ajax4jsf.SKIN</param-name>
  <param-value>DEFAULT</param-value>
 </context-param>
 <filter>
  <display-name>Ajax4jsf Filter</display-name>
  <filter-name>ajax4jsf</filter-name>
  <filter-class>org.ajax4jsf.Filter</filter-class>
 </filter>
 <filter-mapping>
  <filter-name>ajax4jsf</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
 
 
 <filter-mapping>
  <filter-name>extensionsFilter</filter-name>
  <url-pattern>*.jsf</url-pattern>
 </filter-mapping>
 <filter-mapping>
  <filter-name>extensionsFilter</filter-name>
  <url-pattern>/faces/*</url-pattern>
 </filter-mapping>
 
 <!--  sun ri start up 
 <listener>
  <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
 </listener>
 -->
 <!-- Listener, that does all the startup work (configuration, init). -->
 
 <listener>
  <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class>
 </listener>
 
 <servlet>
  <servlet-name>Faces Servlet</servlet-name>
  <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
 </servlet>
 
 <servlet>
          <servlet-name>SourceCodeServlet</servlet-name>
            <servlet-class>
            org.apache.myfaces.shared_tomahawk.util.servlet.SourceCodeServlet
            </servlet-class>
 </servlet>
 
 <servlet-mapping>
  <servlet-name>Faces Servlet</servlet-name>
  <url-pattern>*.jsf</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
  <welcome-file>index.jsf</welcome-file>
  <welcome-file>index.jsp</welcome-file>
  <welcome-file>index.html</welcome-file>
 </welcome-file-list>
</web-app>

Merci