Jackson: Serialize only marked fields

Question

I am trying to do something which was quite easy in gson. Since I switched to Jackson as serializer, I couldn't figure out how to implement this:

I want to serialize only fields that have been marked by an Annotation. GSON code would be:

class Foo {
    @Expose
    public String sometext="Hello World";
    @Expose
    public int somenumber=30;
    public float noop=1.0;
    ...
 }

which should result in (JSON)

 {
    Foo: {
        sometext:'Hello World',
        somenumber: 30
    }
 }

(Syntax errors may be ignored - source is just for demonstration)

So what's the Jackson counterpart for gson's @Expose and new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();?

Answer 1

There seems to be a way to configure ObjectMapper to ignore all non annotated fields.

ObjectMapper mapper = new ObjectMapper();
mapper.setVisibilityChecker(getSerializationConfig().getDefaultVisibilityChecker()
.withCreatorVisibility(JsonAutoDetect.Visibility.NONE)
.withFieldVisibility(JsonAutoDetect.Visibility.NONE)
.withGetterVisibility(JsonAutoDetect.Visibility.NONE)
.withIsGetterVisibility(JsonAutoDetect.Visibility.NONE)
.withSetterVisibility(JsonAutoDetect.Visibility.NONE));

Source