Подскажите пожалуйста, Exception For input string: ""

public class Solution {
    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String nameFile = reader.readLine();

        FileInputStream fileInputStream = new FileInputStream(nameFile);

        ArrayList<Integer> list = new ArrayList<>();

        while (fileInputStream.available() > 0) {
            int num = Integer.parseInt(reader.readLine());
            if (num % 2 == 0)
                list.add(num);
        }
        reader.close();
        fileInputStream.close();

        Collections.sort(list);

        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i));
        }
    }
}