java.lang.NumberFormatException: For input string: "150", but I've tried everything, How can I fix this error?

Question

Exception in thread "main" java.lang.NumberFormatException: For input string: "150"
        at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
        at java.base/java.lang.Long.parseLong(Long.java:711)
        at java.base/java.lang.Long.parseLong(Long.java:836)
        at Median.main(Median.java:45)

import java.io.*;
import java.util.*;

public class Median {
    
    public static Long selection(ArrayList<Long> numbers, int k) throws IOException {
        long pivot = numbers.get(0); //Line 8
        ArrayList<Long> left = new ArrayList<Long>();
        ArrayList<Long> middle = new ArrayList<Long>();
        ArrayList<Long> right = new ArrayList<Long>();

        for(int i = 1; i <= numbers.size(); i++) {
            if(numbers.get(i) < pivot) {
                left.add(numbers.get(i)); 
            }
            else if(numbers.get(i) == pivot) {
                middle.add(numbers.get(i));
            }
            else {
                right.add(numbers.get(i));
            }
        }
        middle.add(pivot);

        if(k <= left.size()) {
            return selection(left, k);
        }
        else if(left.size() < k && k <= right.size()) {
            return middle.get(0);
        }
        else {
            return selection(right, k-left.size() - middle.size());
        }
    }

    public static void main(String[] args) throws IOException {
        ArrayList<Long> numsList = new ArrayList<Long>();

        try(BufferedReader br = new BufferedReader(new FileReader("manhattanAirBnbPrivateRoomPrices.txt"))) {
        String line = br.readLine();
        String [] integers = line.trim().split("\n");
        for(String integer: integers) {
            numsList.add(Long.parseLong(integer)); // Line 45
        }
        } catch(IOException e) {
            e.printStackTrace();
        }

        int position = numsList.size();
        if((numsList.size() % 2) == 0) {
            position = numsList.size() / 2;
        }
        else {
            position = (int) numsList.size() / 2;
        }

        selection(numsList, position); 
    }
}

I've tried everything with Integer as the data type for everything (return type in selection method, ArrayList types, etc.) and it has the same error on line 45. I am reading from a text file using BufferedReader, but I tried using Scanner at first, but there was an ArrayIndexOutOfBounds error when trying to execute line 8 (long pivot = numbers.get(0);), so I switched it and that error went away, but came with this other one. What can I do to fix it, it sees like there's no way I can read the first line in the text file (150) because apparently its too large to be an integer and it just doesn't work when I changed everything to be of type long?!?!