mvn compile spring-boot:run
For correct Mysql connection check db, user and password (fix UserDao.java)
Before start you need create table.
CREATE TABLE IF NOT EXISTS `register` ( `id` int(10) NOT NULL AUTO_INCREMENT, `name` varchar(100) NOT NULL, `password` varchar(100) NOT NULL, `email` varchar(100) NOT NULL, `sex` varchar(100) NOT NULL, `country` varchar(100) NOT NULL, PRIMARY KEY (`id`) );