[1] JAX-RS uses annotations, introduced in Java SE 5, to simplify the development and deployment of web service clients and endpoints.

A notable feature of being an official part of Java EE is that no configuration is necessary to start using JAX-RS.

They include: In addition, it provides further annotations to method parameters to pull information out of the request.

The main targets are (among others) a common client API and support for Hypermedia following the HATEOAS-principle of REST.

Main new supported features include server-sent events, reactive clients, and JSON-B.