@JsonInclude is ignored when using BeanSerializerModifier

[Rj Ewing]

I have written a custom JsonSerializer to allow overriding of json views using a custom 

@JsonViewOverride

annotation. Everything is working as expected except for 1 minor detail. Properties with null values are not being serialized. I have the default settings for

@JsonInclude

and have tried to add the annotation    

@JsonInclude(JsonInclude.Include.ALWAYS)

.

If I don't register my BeanSerializerModifier, @Jsoninclude annotation is used. Any ideas why this might be happening and how to fix it?

Serializer.class

public class JsonViewOverrideSerializer extends JsonSerializer implements ContextualSerializer {

    private final JsonSerializer beanSerializer;

    private final Class overrideView;

    public JsonViewOverrideSerializer(JsonSerializer<?> serializer) {

        this(serializer, null);

    }

    public JsonViewOverrideSerializer(JsonSerializer<?> serializer, Class<?> overrideView) {

        this.beanSerializer = serializer;

        this.overrideView = overrideView;

    }

    @Override

    public void serialize(Object value, JsonGenerator gen, SerializerProvider provider) throws IOException {

        SerializerProvider effectiveProvider = provider;

        if (overrideView != provider.getActiveView()) {

            effectiveProvider = overrideProvider(overrideView, gen, provider);

        }

        beanSerializer.serialize(value, gen, effectiveProvider);

    }

    private SerializerProvider overrideProvider(Class<?> overrideView, JsonGenerator gen, SerializerProvider provider) {

        return ((DefaultSerializerProvider) provider).createInstance(provider.getConfig().withView(overrideView), ((ObjectMapper) gen.getCodec()).getSerializerFactory());

    }

    @Override

    public JsonSerializer<?> createContextual(SerializerProvider prov, BeanProperty property) throws JsonMappingException {

        JsonSerializer<?> serializer = this.beanSerializer;

        if (serializer instanceof ContextualSerializer) {

            serializer = ((ContextualSerializer) serializer).createContextual(prov, property);

        }

        if (property != null) {

            JsonViewOverride jsonViewOverride = property.getAnnotation(JsonViewOverride.class);

            if (jsonViewOverride != null) {

                Class<?> jsonView = jsonViewOverride.value();

                serializer = new JsonViewOverrideSerializer(serializer, jsonView);

            }

        }

        return serializer;

    }

}

BeanSerializerModifier:

public class MySerializerModifier extends BeanSerializerModifier {

    @Override

    public JsonSerializer<?> modifySerializer(SerializationConfig config, BeanDescription beanDesc, JsonSerializer<?> serializer) {

        return new JsonViewOverrideSerializer(serializer);

    }

}

ObjectMapper:

    public SpringObjectMapper() {

        Hibernate5Module hm = new Hibernate5Module();

        hm.configure(Hibernate5Module.Feature.USE_TRANSIENT_ANNOTATION, false);

        this.registerModule(hm);

        this.enable(SerializationFeature.INDENT_OUTPUT);

        this.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));

        this.registerModule(

                new SimpleModule()

                        .setSerializerModifier(new FimsSerializerModifier())

        );
    }

[Tatu Saloranta]

Ignored in what way? What is happening? What does your
`JsonViewOverrideSerializer` look like?

One common problem is that all delegating serializers MUST implement
`ResolvableSerializer` and `ContextualSerializer`, and delegate them
to underlying serializer -- otherwise that instance can not be
re-configured with annotations. This may be what is happening in your
case.
It may be worthwhile to have a look at `StdDelegatingSerializer` to
see how it handles this.

-+ Tatu +-

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[Rj Ewing]

The problem was I didn't implement ResolvableSerializer. 

null properties weren't being serialized, but now they are.

Thanks,
RJ