BadRead.java

 public static void readCsv(String filePath) {
  BufferedReader reader = null;
  
  try {
   List<User> users = new ArrayList<User>();
   String line = "";
   reader = new BufferedReader(new FileReader(filePath));
   reader.readLine();
   
   while((line = reader.readLine()) != null) {
    String[] fields = line.split(",");
    
    if(fields.length > 0) {
     User user = new User();
     user.setId(Integer.parseInt(fields[0]));
     user.setFirstName(fields[1]);
     user.setLastName(fields[2]);
     users.add(user);
    }
   }
   
   for(User u: users) {
    System.out.printf("[userId=%d, firstName=%s, lastName=%s]\n", u.getId(), u.getFirstName(), u.getLastName());
   }
   
  } catch (Exception ex) {
   ex.printStackTrace();
  } finally {
   try {
    reader.close();
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
  
 }

BetterRead.java

    public static void readCsv(String filePath) {

        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))){
            reader.readLine();

            List<User> users = reader.lines()
                    .map(line -> line.split(","))
                    .filter(fields -> fields.length > 0)
                    .forEach(this::mapToUser)
                    .collect(toList());

            for(User u: users) {
                System.out.printf("[userId=%d, firstName=%s, lastName=%s]\n", u.getId(), u.getFirstName(), u.getLastName());
            }

        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }

    @NotNull
    private static User mapToUser(String[] fields) {
        User user = new User();
        user.setId(Integer.parseInt(fields[0]));
        user.setFirstName(fields[1]);
        user.setLastName(fields[2]);
        return user;
    }