@Component
public class UserContextResolver implements HandlerMethodArgumentResolver {
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return parameter.getParameterType().equals(UserContext.class);
    }
 
    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavc, NativeWebRequest request, WebDataBinderFactory dbf) {
        String userId = request.getHeader("X-User-ID");
        return new UserContext(userId);
    }
}
 
@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Autowired private UserContextResolver userContextResolver;
    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> resolvers) {
        resolvers.add(userContextResolver);
    }
}