@RequestMapping(value = "/getBowler/{id}", method = RequestMethod.GET)
  public ResponseEntity<String> getBowlerById(@PathVariable int id) {
    List<Bowler> listOfBowlers = new ArrayList<Bowler>(BowlingClub.bowlers);

    for (Bowler b : listOfBowlers) {
      if (b.getID() == id) {
        Gson gson = new Gson();
        String response = gson.toJson(b);
        return new ResponseEntity<>(response, HttpStatus.OK);
      }
    }
    CustomError e = new CustomError("Invalid Bowler ID.");
    Gson gson = new Gson();
    String response = gson.toJson(e);
    return new ResponseEntity<>(response, HttpStatus.BAD_REQUEST);
  }