jetty启动报错org.eclipse.jetty.util.log.Log找不到

Question

<filter>
<filter-name>cross-origin</filter-name>
<filter-class>org.eclipse.jetty.servlets.CrossOriginFilter</filter-class>
<init-param>
    <param-name>allowedOrigins</param-name>
    <param-value>*</param-value>
</init-param>
<init-param>
  <param-name>allowedMethods</param-name>
  <param-value>GET,POST,DELETE,PUT,HEAD</param-value>
</init-param>
<init-param>
  <param-name>allowedHeaders</param-name>
  <param-value>origin, content-type, accept</param-value>
</init-param>
</filter>
<filter-mapping>
  <filter-name>cross-origin</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

我在工程的web.xml里加入了这部分内容，在启动的时候就报错java.lang.ClassNotFoundException: org.eclipse.jetty.util.log.Log，但是这段内容不加就能正常运行，望各位大侠给点帮助。