Currently I am working on a POC for Spring Data Rest. Trying to get workable JSONout of a repository.
I have an Entity Class (NewTask)
@Entity
@Tab
Spring Data REST can only return data for which the repository is registered for. In the other question that you reference, you'll notice that they created a custom repository specifically for the type that they needed. This isn't a bug in SDR, it's just how it functions. It also keeps it RESTful.
So in your case, SDR can only return NewTask or collections of NewTask.