public class DbConncetion {
   public Connection Connect(){
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con= DriverManager.getConnection("jdbc:mysql://localhost:3306/cms?autoReconnect=true&useSSL=false","root","");
            return con;
        }
        catch(Exception ex){
            System.out.println(ex);
        }
        return null;
       }

}

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
java.lang.NullPointerException