Disable Jackson mapper for a particular annotation

Question

With Jackson, it\'s easy to disable all annotations for a given ObjectMapper. Is there a way to only disable one given annotation?

// disable al         


        

Answer 1

This the best I've come across. I think I saw it on the Jackson user group forums somewhere.

Essentially it makes a custom annotation introspector, which returns null if it sees that it has a specific annotation (in this case JsonTypeInfo)

JacksonAnnotationIntrospector ignoreJsonTypeInfoIntrospector = new JacksonAnnotationIntrospector() {
            @Override
            protected TypeResolverBuilder<?> _findTypeResolver(
                    MapperConfig<?> config, Annotated ann, JavaType baseType) {
                if (!ann.hasAnnotation(JsonTypeInfo.class)) {
                    return super._findTypeResolver(config, ann, baseType);
                }
                return null;
            }
        };

        mapper.setAnnotationIntrospector(ignoreJsonTypeInfoIntrospector);

Answer 2

This solution worked for me. Check this for more info

 private static final JacksonAnnotationIntrospector IGNORE_ENUM_ALIAS_ANNOTATIONS = new JacksonAnnotationIntrospector() {

    @Override
    protected <A extends Annotation> A _findAnnotation(final Annotated annotated, final Class<A> annoClass) {
        if (!annotated.hasAnnotation(JsonEnumAliasSerializer.class)) {
            return super._findAnnotation(annotated, annoClass);
        }
        return null;
    }
};

And my custom annotation:

@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotationsInside
@JsonSerialize(using = JsonEnumSerializer.class)
public @interface JsonEnumAliasSerializer {
}

And ObjectMapper:

    final ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.setAnnotationIntrospector(IGNORE_ENUM_ALIAS_ANNOTATIONS);

Answer 3

I think it's a better idea to override findPropertiesToIgnore method like this:

    JacksonAnnotationIntrospector ignoreJsonTypeInfoIntrospector = new JacksonAnnotationIntrospector() {
        @Override
        public String[] findPropertiesToIgnore(AnnotatedClass ac) {
            ArrayList<String> ret = new ArrayList<String>();
            for (Method m : ac.getRawType().getMethods()) {
                if(ReflectionUtils.isGetter(m)){
                    if(m.getAnnotation(Transient.class) != null)
                        ret.add(ReflectionUtils.getPropertyName(m));

                }
            };
            return ret.toArray(new String[]{});
        }
    };
    objectMapper = new ObjectMapper();
    objectMapper.setAnnotationIntrospector(ignoreJsonTypeInfoIntrospector);