NullPointerException в preparedStatment

При добавлении в базу, в с строке preparedStatment = connection.prepareStatement(ADD_USER); ошибка nullPointer как исправить ?

private static Connection connection = null;
    private static PreparedStatement preparedStatment = null;
    private static ResultSet resultSet = null;

    private final String ADD_USER = "insert into users(id, date, name, userName, password, country, phone, email) values(?,?,?,?,?,?,?,?)";
    private final String GET_LIST = "selected id, date, name, userName, password, country, phone, email";
  public void addUser(User user) {
        try {
            connection = onConnectJDBS();
            preparedStatment = connection.prepareStatement(ADD_USER);
            preparedStatment.setInt(1, user.getId());
            preparedStatment.setInt(2, user.getDate());
            preparedStatment.setString(3, user.getName());
            preparedStatment.setString(4, user.getUserName());
            preparedStatment.setString(5, user.getPassword());
            preparedStatment.setString(6, user.getCountry());
            preparedStatment.setString(7, user.getPhone());
            preparedStatment.setString(8, user.getEmail());
            preparedStatment.executeUpdate();
        } catch(SQLException e) {
            e.printStackTrace();
        }
    }