facessonfig
<faces-config version="1.2"
   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-facesconfig_1_2.xsd">

    <application>
        <el-resolver>org.jboss.seam.jsf.SeamELResolver</el-resolver>
    </application>	

    <lifecycle>
        <phase-listener>org.jboss.seam.jsf.SeamPhaseListener</phase-listener>
    </lifecycle>

</faces-config>

web.xml
  <!-- MyFaces -->
    <listener>
        <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class>
    </listener>
 
    <!-- JSF RI -->
    <!--
    <listener>
        <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
    </listener> 
    -->