Tomcat7安装版，配置链接数，启动警告

在安装版的Tomcat7下，配置了连接数：

  <Connector port="8060" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" URIEncoding="UTF-8" maxThreads="300" 
  minSpareThreads="10"  maxSpareThreads="300"
   />

启动时警告：
2016-5-29 11:07:45 org.apache.catalina.startup.SetAllPropertiesRule begin
警告: [SetAllPropertiesRule]{Server/Service/Connector} Setting property 'maxSpareThreads' to '300' did not find a matching property.
求解决办法？