IOException. Пачиму?

public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String dateRead = reader.readLine();
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MMM dd, yyyy", Locale.ENGLISH);

            Date date = simpleDateFormat.parse(dateRead);

        System.out.println(simpleDateFormat.format(dateRead));
    }
}