struts2.0 打开页面后，长久的空白,不能正常显示,后台报有异常

<filter>
                <filter-name> struts2 </filter-name>                
                <filter-class> org.apache.struts2.dispatcher.FilterDispatcher </filter-class>
        </filter>
        <filter-mapping>
                <filter-name> struts2 </filter-name>
                <url-pattern> /* </url-pattern>
        </filter-mapping> 
将filter改成servlet看看。