Tomcat7安装版，配置链接数，启动警告：配置报错 

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：
  2015-5-29 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？