如何访问WebRoot下级目录的JSP文件

如WebRoot/back/123.jspserver.xml配置如何：
<Service name="Catalina">
    <Connector port="80" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
    <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
    <Engine name="Catalina" defaultHost="localhost">
      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
               resourceName="UserDatabase"/>
      </Realm>      <Host name="localhost"  appBase="F:\myeclipse_workspace\Lottery\WebRoot"
            unpackWARs="true" autoDeploy="true">
        <Context path="/" docBase="F:/myeclipse_workspace/Lottery/WebRoot" reloadable="true" />
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log" suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />
      </Host>
    </Engine>
  </Service>http://localhost/back/123.jsp无法访问，提示：type Status report
message /back/123.jsp
description The requested resource is not available.请问如何修改？谢谢！