<Realm className="org.apache.catalina.realm.JDBCRealm"
      driverName="com.mysql.jdbc.Driver"
      connectionURL="jdbc:mysql://localhost:3306/coupon_system?user=root;password=plemia000"
      userTable="user" userNameCol="nickname" userCredCol="password"
      userRoleTable="user_roles" roleNameCol="role"/>

mysqladmin -u root password qwertyuiop123