Hello,
I'm trying to setup a project with seam 1.2.1 on WebSphere v6.1.0.7.

WAS v6.1.0.7 has a JSF 1.1 implementation based on JSF Sun RI. When WAS tries to start the application, I get the following exception:

WebApp E Extension processor failed to initialize in factory: com.ibm.ws.jsf.extprocessor.JSFExtensionFactory@cd60cd6
java.lang.ClassCastException: org.jboss.seam.jsf.SeamApplication11 incompatible with com.sun.faces.application.ApplicationImpl
at com.ibm.ws.jsf.configuration.FacesConfigParser.createFacesFactories(FacesConfigParser.java:1019)
at com.ibm.ws.jsf.configuration.FacesConfigParser.initializeConfiguration(FacesConfigParser.java:354)
at com.ibm.ws.jsf.util.FacesConfigUtil._parseJSFConfiguration(FacesConfigUtil.java:128)
at com.ibm.ws.jsf.util.FacesConfigUtil.parseJSFConfiguration(FacesConfigUtil.java:82)
at com.sun.faces.util.Util.verifyFactoriesAndInitDefaultRenderKit(Util.java:497)
at com.ibm.ws.jsf.configuration.FacesConfig.initialize(FacesConfig.java:96)

Q:
- Any idea for this exception (I'v tried lots of things to try to have it working, including playing with classloader...)
- What is the requirement for seam on JSF: Does seam absolutely requires "MyFaces" as JSF implementation? or can I use WAS JSF 1.1 implementation bases on Sun RI? or more generally any JSF 1.1 compatible implementation?
- Anyone there running seam 1.2.1 on WAS v6.1.0.7 with the builtin JSF implementation?
thx

file /WEB-INF/faces-config.xml:
------------------------------------
<?xml version="1.0"?>
<!DOCTYPE faces-config PUBLIC "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN" "http://java.sun.com/dtd/web-facesconfig_1_1.dtd">
<faces-config>

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

</faces-config>

file /WEB-INF/web.xml:
--------------------------
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" 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">
<context-param>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>server</param-value>
</context-param>
<context-param>
<param-name>javax.faces.CONFIG_FILES</param-name>
<param-value>/WEB-INF/faces-config.xml</param-value>
</context-param>
<context-param>
<param-name>javax.faces.DEFAULT_SUFFIX</param-name>
<param-value>.jsp</param-value>
</context-param>
<context-param>
<param-name>com.sun.faces.NUMBER_OF_VIEWS_IN_SESSION</param-name>
<param-value>15</param-value>
</context-param>
<context-param>
<param-name>com.sun.faces.enableHighAvailability</param-name>
<param-value>false</param-value>
</context-param>
<context-param>
<param-name>com.sun.faces.COMPRESS_STATE</param-name>
<param-value>false</param-value>
</context-param>
<context-param>
<param-name>com.ibm.ws.jsf.JSP_UPDATE_CHECK</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>com.ibm.ws.jsf.LOAD_FACES_CONFIG_AT_STARTUP</param-name>
<param-value>true</param-value>
</context-param>

<listener-class>com.sun.faces.config.ConfigureListener</listener-class>
<listener-class>org.jboss.seam.servlet.SeamListener</listener-class>


<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>-1</load-on-startup>


<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.faces</url-pattern>
</servlet-mapping>

</web-app>