deploy MyFaces as portlet into Websphere Portal 5.1

[Storm Spire]

Hi,
  I am suffering on running myfaces app as portlet into websphere portal 5.1 these days. 
  I am really not sure what I have done wrong.
  I can deploy the myfaces war file without a problem, but when I run the portlet, I will see an error " This portlet is unavailable".
  The log from PortalServer\log folder will only give this message:

2006.07.15 14:28:44.140 E com.ibm.wps.engine.tags.PortletRenderTag doStartTag
  javax.portlet.UnavailableException: WebApplication is stopped


  My environment:
  websphere portal 5.1.0.2
  myfaces 1.1.3
  windows XP

  Here is my web.xml:
------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" " http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app id="WebApp_ID">
    <display-name>testPortal</display-name>
    <context-param>
        <param-name>javax.faces.CONFIG_FILES </param-name>
        <param-value>
            /WEB-INF/faces-config.xml
        </param-value>
    </context-param>
    <listener>
        <listener-class>
            org.apache.myfaces.webapp.StartupServletContextListener
        </listener-class>
    </listener>
    <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>*.jsf</url-pattern>
    </servlet-mapping>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm </welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file> default.jsp</welcome-file>
    </welcome-file-list>
</web-app>
------------------------------------------------

my portlet.xml:
------------------------------------------------
<?xml version=" 1.0" encoding="UTF-8"?>
<portlet-app xmlns=" http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd" version="1.0" xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd " id="testPortal.8ba3a7c6c0">
    <portlet>
        <portlet-name>csc</portlet-name>
        <display-name>csc portlet</display-name>
        <display-name xml:lang="zh">csc portlet</display-name>
        <portlet-class>
            org.apache.myfaces.portlet.MyFacesGenericPortlet
        </portlet-class>
        <init-param>
            <name>default-view</name>
            <value>/test.jsp</value>
        </init-param>
        <supports>
            <mime-type>text/html</mime-type>
            <portlet-mode>view</portlet-mode>
        </supports>
        <portlet-info>
            <title>csc portlet</title>
        </portlet-info>
    </portlet>
</portlet-app>
------------------------------------------------
My faces-config.xml is empty, as I want to test the plain jsf only, didn't use any managed bean.