myeclipse-mysql+Myeclipse在页面上提交数据的时候出错

Servlet.service() for servlet [default] in context with path [/tushu] threw exception [java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)] with root cause
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES) 这是什么错啊 怎么修改