Because there is no defined standard format for serializing collections in XML or even text plain. And JAX-RS specification is not the right place to do so.
Hope this helps you at least understand the underlying problem,
Marek
> On 17 Dec 2014, at 15:08, Tomaz Majerhold <tomaz.majerhold_at_arnes.si> wrote:
>
> I can't understand why Coolection is not in default entity providers, Collection is widely use in Java.
>
> Regards, Tomaz