Conflito richfaces com filtro

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
      
    <display-name>a4jEchoText</display-name>
    <context-param>
        <param-name>org.richfaces.SKIN</param-name>
        <param-value>blueSky</param-value>
    </context-param>
    <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>server</param-value>
    </context-param>
    <filter> 
        <display-name>RichFaces Filter</display-name> 
        <filter-name>richfaces</filter-name> 
        <filter-class>org.ajax4jsf.Filter</filter-class> 
    </filter> 
    <filter-mapping> 
        <filter-name>richfaces</filter-name> 
        <servlet-name>Faces Servlet</servlet-name>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
        <dispatcher>INCLUDE</dispatcher>
    </filter-mapping>
    <listener>
        <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
    </listener>      
    
    <filter>
        <filter-name>MainFilter</filter-name>
        <filter-class>controller.MainFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>MainFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping> 

    
    <context-param>
        <param-name>com.sun.faces.verifyObjects</param-name>
        <param-value>false</param-value>
    </context-param>
    <context-param>
        <param-name>com.sun.faces.validateXml</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>client</param-value>
    </context-param>
    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>faces/index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

/*
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 * and open the template in the editor.
 */

package controller;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import vo.UsuarioVO;

/**
 *
 * @author joaosavio
 */

//Filtro de autenticação
public class MainFilter implements Filter {  
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {  
        HttpServletRequest hreq = (HttpServletRequest)req;  
        HttpServletResponse hres = (HttpServletResponse)res;  
        UsuarioVO usuarioVO = new UsuarioVO();
        usuarioVO = (UsuarioVO) hreq.getSession().getAttribute("usuarioVO");
          
        if(usuarioVO != null) { 
            chain.doFilter(req,res); 
        }
        else {  
            RequestDispatcher rd = req.getRequestDispatcher("/faces/index.jsp");  
            rd.forward(hreq,hres); 
        }  

    }

    public void init(FilterConfig arg0) {
    }

    public void destroy() {
        
    }
}