java - Jackson filtering out fields without annotations

Question

I was trying to filter out certain fields from serialization via SimpleBeanPropertyFilter using the following (simplified) code:

public static void main(String[] args) {
    ObjectMapper mapper = new ObjectMapper();

    SimpleFilterProvider filterProvider = new SimpleFilterProvider().addFilter("test",
            SimpleBeanPropertyFilter.filterOutAllExcept("data1"));
    try {
        String json = mapper.writer(filterProvider).writeValueAsString(new Data());

        System.out.println(json); // output: {"data1":"value1","data2":"value2"}

    } catch (JsonProcessingException e) {
        e.printStackTrace();
    }
}

private static class Data {
    public String data1 = "value1";
    public String data2 = "value2";
}

Us I use SimpleBeanPropertyFilter.filterOutAllExcept("data1")); I was expecting that the created serialized Json string contains only {"data1":"value1"}, however I get {"data1":"value1","data2":"value2"}.

How to create a temporary writer that respects the specified filter (the ObjectMapper can not be re-configured in my case).

Note: Because of the usage scenario in my application I can only accept answers that do not use Jackson annotations.

Answer 1

If for some reason MixIns does not suit you. You can try this approach:

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setAnnotationIntrospector(new JacksonAnnotationIntrospector(){
    @Override
    public boolean hasIgnoreMarker(final AnnotatedMember m) {

    List<String> exclusions = Arrays.asList("field1", "field2");
    return exclusions.contains(m.getName())|| super.hasIgnoreMarker(m);
    }
});