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@RequestMapping(method = RequestMethod.POST, value = "/letter")
    String getLetter(String email,int age,String letterText) {
        Letter letter = new Letter();
        letter.setAge(age);
        letter.setEmail(email);
        letter.setLetter(letterText);
        letterService.addLetter(letter);
        return null;
    } //это letter controller


public interface LetterService {
    Letter addLetter(Letter letter);
}//letterservice

@Service
public class LetterServiceImpl implements LetterService {
    @Autowired
    LetterRepository letterRepository;

    @Override
    public Letter addLetter(Letter letter) {
       return letterRepository.save(letter);
    }//implementation