Where can I find tutorial/documentation for uploading files using EE6 JAX-RS?

[sboscarine]

Is there a way in EE6 to have JAX-RS upload files? Where can I go for a tutorial or documentation?

I've found tutorials for doing it in Jersey and RESTEasy.  I'd prefer to do it just using core EE6 (AS7.1/EAP6.0.1) if that's feasible. 

[nickarls]

http://www.mkyong.com/webservices/jax-rs/file-upload-example-in-resteasy/

As long as your code only references the api classes you are really doing it with "plain EE" since there will always be an implementation under the hood