@Component
public class CurrentUserArgumentResolver implements HandlerMethodArgumentResolver {
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return parameter.getParameterType().equals(UserAccount.class);
    }
 
    @Override
    public Object resolveArgument(MethodParameter parameter, 
                                  ModelAndViewContainer mavContainer, 
                                  NativeWebRequest webRequest, 
                                  WebDataBinderFactory binderFactory) {
        String userId = webRequest.getHeader("X-User-Id");
        return userRepository.findById(userId).orElseThrow();
    }
}