I don't know why it have exception when I deploy jsf1.2 web application to jboss4.0 or jboss4.2

1.when i deploy jsf web application to jboss4.2 service the exception is:
2008-03-07 13:17:03,937 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/kk]] Exception sending context initialized event to listener instance of class org.jboss.web.jsf.integration.config.JBossJSFConfigureListener
java.lang.ClassCastException: com.sun.faces.application.ApplicationAssociate cannot be cast to com.sun.faces.application.ApplicationAssociate

2.when i deploy jsf web application to jboss4.0 service the exception is:
2008-03-07 13:14:10,531 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/testjsf].[jsp]] Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at javax.faces.webapp.UIComponentTag.setupResponseWriter(UIComponentTag.java:615)
at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:217)
at org.apache.myfaces.taglib.core.ViewTag.doStartTag(ViewTag.java:71)

3.below is my /lib/ jar file:
commons-beanutils.jar
commons-collections.jar
commons-digester.jar
commons-logging.jar
jsf-api.jar
jsf-impl.jar
jstl-1.2.jar
servlet-api.jar

4.below is my web.xml:

<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>

<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>/faces/index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>/faces/default.jsp</welcome-file>
</welcome-file-list>

who help me solve the question ,Thank you very mach