try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection("jdbc:mysql://10.114.34.129:3306/holiday_spirit", "KÄYTTIS", "SALIS");
            java.sql.Statement stmt = con.createStatement();

            String SQL = "SELECT * FROM holiday_spirit.Users WHERE Username='" + username + "'";

            ResultSet rs = stmt.executeQuery(SQL);

            if (rs.next()) {
                System.out.println("Username taken!");

            } else {
                u.setUsername(username);
            }

        } catch (Exception e) {

            System.out.println("Error : " + e.getMessage());
        }