I am trying to use ajax4jsf in RAD6. The server is WebSphere Application Server v6.0. I get that error when trying to run the web application. The jar files I have in /WEB-INF/lib are oscache-2.3.2.jar and ajax4jsf-1.1.0.jar. I also have configured the web.xml with

<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>
 <servlet-name>Faces Servlet</servlet-name>
 <dispatcher>REQUEST</dispatcher>
 <dispatcher>FORWARD</dispatcher>
 <dispatcher>INCLUDE</dispatcher>
 </filter-mapping>