Question

I am using an abstract class to localize my models to different languages. This is the inheritance chain that I have set up:

//Base model, contains localized fields
public class Restaurant extends LocalizedModel<LocalizedRestaurantData>{

...

}

//Abstract class to support localized fields for all my models
@XmlRootElement
public abstract class LocalizedModel<T extends LocalizedData> {

    private T en;

    public T getEn() {
        return en;
    }
    public void setEn(T en) {
        this.en = en;
    }
    ...
}

//Implementation of the localized fields for the restaurant class.
@XmlRootElement
public class LocalizedRestaurantData extends LocalizedData{

    protected String name;
    protected String address;
    ...
}

This all works fine in my Jersey JSON web service, except for one thing: All the instances of the localized property en contain an extra field type:

Restaurant JSON:

{
"en": {
        "type": "localizedRestaurantData",
        "address": "1234 Main St.",
        "name": "Tacos Folie"
    },
 ...
}

This type field is undesired and undesirable especially since it seems to be also required by Jackson when parsing an object. I’ve added @JsonIgnoreProperties({"type"}) in my code without success.

Answer 1

After multiple attempts and soliciting help on both the Jackson and the Jersey mailing list, the solution I found is:

My JERSEY context was implementing ContextResolver<JSONJAXBContext>. That needs to be changed to ContextResolver<JacksonJsonProvider> to use the pure JSON parser.

Secondly, the JacksonJsonProvider needs to configured as follows:

JacksonJsonProvider jjp = new JacksonJsonProvider();
jjp.configure(Feature.WRITE_NULL_MAP_VALUES, false);
jjp.configure(Feature.WRITE_NULL_PROPERTIES, false);

And used as the context.

Finally, the following method needs to be overriden as follows in the ContextResolver:

@Override
    public Set<Object> getSingletons() {
      Set<Object> s = new HashSet<Object>();
      JacksonJsonProvider jjp = new JacksonJsonProvider();
      jjp.configure(Feature.WRITE_NULL_MAP_VALUES, false);
      jjp.configure(Feature.WRITE_NULL_PROPERTIES, false);
      s.add(jjp);
      return s;
    }