自己建了一个WEB工程，在WEB.XML文件中加入监听，运行程序出现404无法访问，去掉就能正确出现首页，怎么回事？

<display-name>auction</display-name>

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:spring.xml,classpath:spring-mybatis.xml</param-value>

</context-param>

    <listener>

<description>spring监听器</description>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

<context-param>

<param-name>spring.profiles.active</param-name>

<param-value>dev</param-value>

</context-param>

<filter>

<description>字符集过滤器</description>

<filter-name>encodingFilter</filter-name>

<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

<init-param>

<description>字符集编码</description>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param>

<init-param>

<param-name>forceEncoding</param-name>

<param-value>true</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encodingFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

<servlet>

<description>spring mvc servlet</description>

<servlet-name>springMvc</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>

<description>spring mvc 配置文件</description>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:spring-mvc.xml</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>springMvc</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

<session-config>

<session-timeout>20</session-timeout>

</session-config>

<welcome-file-list>

<welcome-file>/xia/login.jsp</welcome-file>

<welcome-file>index.jsp</welcome-file>

<welcome-file>login.jsp</welcome-file>

<welcome-file>/xia/index.jsp</welcome-file>

</welcome-file-list>

</web-app>