Метод поиска в контроллере Spring не работает

public interface UserRepo extends CrudRepository<User, Long> {
User findByUsername(String username);
 
User findByActivationCode(String code);
 
Page<UserDto> findAll(Pageable pageable);
 
Page<UserDto> findByUsername(@Param("username") String search, Pageable pageable);
}

@Service
public class UserService implements UserDetailsService {
@Autowired
private UserRepo userRepo;
 
public Page<UserDto> userList(Pageable pageable, String search) {
    if (search != null && !search.isEmpty()) {
        return userRepo.findByUsername(search, pageable);
    } else {
        return userRepo.findAll(pageable);
    }
}

public class UserDto {
    private Long id;
    private String firstname;
    private String lastname;
    private String username;
    private String email;
    ...
 
    public UserDto(User user) {
        this.id = user.getId();
        this.firstname = user.getFirstname();
        this.lastname = user.getLastname();
        this.username = user.getUsername();
        this.email = user.getEmail();
        ...
    }... + getters

@GetMapping("/users")
public String readAllUsers(
        @RequestParam(required = false, defaultValue = "") String search,
        @PageableDefault(sort = {"id"}, direction = Sort.Direction.DESC) Pageable pageable,
        Model model) {
    Page<UserDto> page = userService.userList(pageable, search);
    model.addAttribute("url", "/admin/users");
    model.addAttribute("page", page);
    model.addAttribute("search", search);
    model.addAttribute("roles", Role.values());
    return "adminUsers";
}

    Page<User> findByFullnameContains(String firstname, Pageable pageable);

@Entity
@Table
public class User implements UserDetails, Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
 
    @NotBlank(message = "Firstname cannot be empty")
    private String firstname;
 
    @NotBlank(message = "Lastname cannot be empty")
    private String lastname;
 
    private String fullname;
...