Problems using FilterProvider with Jackson 2.0

ObjectMapper mapper = new ObjectMapper();

// first, construct filter provider to exclude all properties but 'name', bind it as 'myFilter'
FilterProvider filters = new SimpleFilterProvider().addFilter("myFilter",
SimpleBeanPropertyFilter.filterOutAllExcept("name"));

// and then serialize using that filter provider:
String json = mapper.writer(filters).writeValueAsString(new Object() {
  public String name = "a";
  public int num = 2;
});

System.out.println(json);