tomcat启动失败，求解答

问题：tomcat启动失败

问题描述：启动Tomcat时弹出

[ com.mongodb.ConnectionStatus$UpdatableNode update
警告: Server seen down: /127.0.0.1:27017 - java.io.IOException - message: couldn't connect to [/127.0.0.1:27017] bc:java.net.ConnectException: Connection refused: connect]