Wątki i czytanie z pliku

public class FirstTheard implements Runnable  {
	 
	
	 @Override
     public void run(){
		
		while(true) {
			 
	  		try{
	               Thread.sleep(200);
	          
	            } catch (InterruptedException e){
	               System.out.println("wątek przerwany");
	               return;
	            }
	
			 
			
		
		}
		numbersLine();   
        }
	 
	 
	
	
	 public void numbersLine() {
		 String fname = System.getProperty("../towary.txt"); 
		 FileReader fr;
		
         System.out.println("Metoda wydrukuj100");
         try {
  		fr = new FileReader(fname);
		BufferedReader bfr = new BufferedReader(fr);
		 String line="";
  		 int licznik=0;
  		 while((line = bfr.readLine())!= null){
  			 
  			 licznik=licznik+1;
  		     }
  		 System.out.println("Ilosc linii "+licznik);
  		 
  		 fr.close();
         }catch (IOException e){
             System.out.println("Uwaga");
            
          }
	 }
	 
     }

try {
   // tu kod, z ktorego lapiesz wyjatki
} catch(KlasaWyjatku exception) {
   // tu obsluga wyjatku
}

catch (IOException e){
             System.out.println("Uwaga");

          }

e.printStackTrace();

Exception in thread "Thread-0" java.lang.NullPointerException
	at java.io.FileInputStream.<init>(FileInputStream.java:130)
	at java.io.FileInputStream.<init>(FileInputStream.java:93)
	at java.io.FileReader.<init>(FileReader.java:58)
	at zad53.FirstTheard.numbersLine(FirstTheard.java:41)
	at zad53.FirstTheard.run(FirstTheard.java:13)

String fname = System.getProperty("../towary.txt"); 

public final class CountLinesTask implements Callable<Long> {

    private final Path file;

    public CountLinesTask(Path file) {
        this.file = file;
    }

    @Override
    public Long call() throws Exception {
       try (Stream<String> lines = Files.lines(file)) {
          return lines.count();
       }
    }
}

class CountLinesTaskTest {

    ExecutorService executorService = Executors.newSingleThreadExecutor();
    Path file = TestUtils.getPath("concurrency/random_numbers_1.txt");

    @Test
    void countLinesTest() throws Exception {
        //given
        Callable<Long> countLinesTask = new CountLinesTask(file);

        //when
        long counter = executorService.submit(countLinesTask).get();

        //then
        Assertions.assertEquals(1000, counter);
    }

}