Support for Enum type

[CoreFloDev]

Hi,

I would like to know if there is a support for enum type with the library

@AutoValue
public abstract class Facility implements Parcelable {

    public enum Codes {
        @SerializedName("CPF") FREE,
        @SerializedName("COP") CHARGEABLE,
        @SerializedName("CPP") CHARGEABLE_ONSITE
    }

    @SerializedName("code")
    public abstract Codes code();

    @SerializedName("legend")
    public abstract String legend();

    @NonNull
    public static TypeAdapter<Facility> typeAdapter(Gson gson) {
        return new AutoValue_Facility.GsonTypeAdapter(gson);
    }
}

According to this answer http://stackoverflow.com/a/18851314 on stackoverflow, this is a valid syntax for Gson, but when I try it I get a null pointer exception.

Thanks

[CoreFloDev]

My bad, I forgot the @nullable annotation on the code() method because I don't have the entire list of enum value