tomcat下jsf移到weblogic8下出错

tomcat下jsf移到weblogic8下出错

错误如下: Servlet: "Faces" failed to preload on startup in Web application
我的方法是修改web.xml如下:
<?xml version="1.0" encoding="gb2312"?>
<web-app xmlns=" http://java.sun.com/xml/ns/j2ee " xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance " version="2.4" 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.CONFIG_FILES</param-name>
  <param-value>/WEB-INF/faces-config.xml</param-value>
 </context-param>
 
  //listener节点是新加的
 <listener>
  <listener-class>com.sun.faces.config.ConfigureListener</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>//本来是0先在改为-1
 </servlet>
 
 <servlet-mapping>
  <servlet-name>Faces Servlet</servlet-name>
  <url-pattern>*.faces</url-pattern>
 </servlet-mapping>
</web-app>