Jetty springMvc 首页路径访问

我用Jetty作为web服务器 项目采用的是springmvc框架。

启动jetty 访问项目http://127.0.0.1:4444/mobile/
出现404异常





但用tomcat作为web服务器 启动项目访问：http://127.0.0.1:4444/mobile/
却能正常访问。。

困扰了好久 难道是jetty的原因吗？？？？    
这是我的xml配置：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.jpg</url-pattern>
    <url-pattern>*.gif</url-pattern>
    <url-pattern>*.js</url-pattern>
    <url-pattern>*.png</url-pattern>
    <url-pattern>*.bmp</url-pattern>
    <url-pattern>*.swf</url-pattern>
    <url-pattern>*.css</url-pattern>
    <url-pattern>*.ico</url-pattern>
    <url-pattern>*.html</url-pattern>
    <url-pattern>*.htm</url-pattern>
    <url-pattern>*.xml</url-pattern>
  </servlet-mapping>
  <filter>
    <filter-name>CharactEncoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>CharactEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <servlet>
    <servlet-name>BFLYMOBILE</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <multipart-config>
      <max-file-size>52428800</max-file-size>
      <max-request-size>52428800</max-request-size>
      <file-size-threshold>0</file-size-threshold>
    </multipart-config>
  </servlet>
  <servlet-mapping>
    <servlet-name>BFLYMOBILE</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <listener>
    <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
  </listener>
  <listener>
    <listener-class> org.springframework.web.context.request.RequestContextListener </listener-class>
  </listener>
  <session-config>
    <session-timeout>30</session-timeout>
  </session-config>
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>
</web-app>