Tomcat中设置spring出现问题

Tomcat启动错误:

2007-2-28 18:38:47 org.apache.catalina.core.StandardContext start
严重: Error listenerStart
2007-2-28 18:38:47 org.apache.catalina.core.StandardContext start
严重: Context [/function] startup failed due to previous errors

web.xml中的相关配置是这样的:

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/classes/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>

后来改用servlet加载spring   在web.xml里改为  

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        /WEB-INF/classes/applicationContext.xml
    </param-value>
</context-param>
<servlet>
    <servlet-name>context</servlet-name>
    <servlet-class>
        org.springframework.web.context.ContextLoaderServlet
    </servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>

就OK了.

一下啊? 为什么这样呢