@RepositoryRestController
public class UserController {

    private final UserRepository userRepository;

    public UserController(final UserRepository userRepository) {

        this.userRepository = userRepository;
    }

    @GetMapping(value = "users/{id}", params = "fields")
    public ResponseEntity<MappingJacksonValue> getUser(@PathVariable("id") Long id,
                                                       @RequestParam("fields") String fields) {

        MappingJacksonValue wrapper = new MappingJacksonValue(userRepository.findOne(id));

        wrapper.setFilters(new SimpleFilterProvider()
                                   .addFilter("userFilter",
                                              SimpleBeanPropertyFilter.filterOutAllExcept(fields.split(","))));
        return ResponseEntity.ok(wrapper);
    }
}