Following your point about the cruft being from the language, Spring MVC is as "micro" as Spark. In fact, it is shorter.

Spring MVC:

  @Controller
  public class HelloController {
    @RequestMapping(value = "/hello", method = RequestMethod.GET)
    public @ResponseBody String hello() {
      return "Hello World!";
    }
  }
  

  public class HelloWorld {
     public static void main(String[] args) {      
        get(new Route("/hello") {
           @Override
           public Object handle(Request request, Response response) {
              return "Hello World!";
           }
        });
     }
  }