Failed to 5 - 8 requirements. Works on the IDE

package com.codegym.task.task17.task1721;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.io.*;

/*
Transactionality

*/

public class Solution {
    public static List<String> allLines = new ArrayList<>();
    public static List<String> linesForRemoval = new ArrayList<>();

    public static void main(String[] args) {

        Solution s = new Solution();
       try {
           s.joinData();
       }
       catch (IOException e)
       {

       }
    }

    public void joinData() throws IOException {
        FileInputStream fis1 = null;
        FileInputStream fis2 = null;

        String st;
        boolean b = true;
        while(b) {

                BufferedReader reader1 = new BufferedReader(new InputStreamReader(System.in));
                BufferedReader reader2 = new BufferedReader(new InputStreamReader(System.in));

                String filename1 = reader1.readLine();
                String filename2 = reader2.readLine();

                fis1 = new FileInputStream(filename1);
                fis2 = new FileInputStream(filename2);

                reader1 = new BufferedReader(new InputStreamReader(fis1));
                while ((st = reader1.readLine()) != null) {
                        allLines.add(st);
                    }
                reader1.close();
                fis1.close();

                reader2 = new BufferedReader(new InputStreamReader(fis2));

                while ((st = reader2.readLine()) != null) {
                    linesForRemoval.add(st);
                }
                reader2.close();
                fis2.close();

                if (allLines.containsAll(linesForRemoval)) {
                    allLines.removeAll(linesForRemoval);
                } else {
                    allLines.clear();
                    throw new CorruptedDataException();
                }


        }
    }
}