Can not save object to MySQL DB using Java Spring Boot - spring

Question

I've got ENTITY Country with all getters and setters + Constructor with no args. Getters and setter are all written by IDEA, not Lombok.
#Entity
#JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
public class Country {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String code;
private String capital;
private String description;
private String nationality;
private String continent;
#OneToMany(mappedBy="country")
private List<State> states;
public Country() {
}`
Here goes CountryRepository:
#Repository
public interface CountryRepository extends JpaRepository<Country, Integer> {}
Here goes CountryService:
#Service
public class CountryService {
#Autowired
private CountryRepository countryRepository;
public List<Country> getListOfCountries() {
return countryRepository.findAll();
}
public void addNewCountry(Country country) {
countryRepository.save(country);
}
}
and CountryController:
#Controller
public class CountryController {
#Autowired
private CountryService countryService;
#GetMapping("/countries")
private String getListOfCountries(Model model) {
List<Country> listOfCountries = countryService.getListOfCountries();
model.addAttribute("countries", listOfCountries);
return "countries";
}
#PostMapping("/countries/addNew")
private String addNewCountry(#RequestParam String code,
#RequestParam String capital,
#RequestParam String description,
#RequestParam String nationality,
#RequestParam String continent) {
Country country = new Country();
country.setCode(code);
country.setCapital(capital);
country.setDescription(description);
country.setNationality(nationality);
country.setContinent(continent);
countryService.addNewCountry(country);
return "redirect:/countries";
}
}
and here is the form that's supposed to take input, but unfortunately nothing happens(
<div class="modal-body">
<form th:action="#{/countries/addNew}" method="post">
<div class="form-group">
<label for="recipient-name" class="col-form-label">Code:</label>
<input type="text" class="form-control" id="recipient-name" name="code">
</div>
<div class="form-group">
<label for="recipient-name1" class="col-form-label">Capital:</label>
<input type="text" class="form-control" id="recipient-name1" name="capital">
</div>
<div class="form-group">
<label for="recipient-name2" class="col-form-label">Description:</label>
<input type="text" class="form-control" id="recipient-name2" name="description">
</div>
<div class="form-group">
<label for="recipient-name3" class="col-form-label">Nationality:</label>
<input type="text" class="form-control" id="recipient-name3" name="nationality">
</div>
<div class="form-group">
<label for="recipient-name4" class="col-form-label">Continent:</label>
<input type="text" class="form-control" id="recipient-name4" name="continent">
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary" data-dismiss="modal">Add</button>
</div>
</form>
</div>
If I add data manually to the DB everything works fine, but when using this form nothing happens. At the same time I didn't get to errors or whatever. Server runs OK. Instead of JPARepository I tried using CRUDRepository. Also doblechecked the names of the form so they have the same values as Country fields. Realy lost here...