Currently getting exceptions due to abstract class references (Variant):

Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of org.jboss.aerogear.unifiedpush.api.Variant, problem: abstract types either need to be mapped to concrete types, have custom deserializer, or be instantiated with additional type information

Given Matthias' jackson2 PR, we should be able to handle this with Jackson type info annotations