One thing most RESTful applications and / or frameworks do really miss is HATEOAS. This most hard to understand concept of the REST architectural pattern changes the way distributed applications are built fundamentally, and is hard to find in real-life applications. As a JAX-RS expert group member I really am disappointed to see that spec lead Oracle has not yet filled this gap, and possible won’t fill it for even longer looking at the Jersey progress.
I really am glad that Java pro Kai TÖDTER chimes in and shows examples of benefits (and possibly drawbacks?) of real Hypermedia Applications in his session at JavaLand 2016.
This is a required course of the REST 101! 😉