I thought we had all finally settled on JAX-RS, which (along with recent Servlet versions) means that writing RESTful web services in Java is almost as easy and lack-of-boilerplatey as Ruby/Python/anything else you can think of. There's still a question of wrapping it up nicely, but Dropwizard and even Spring will do a nice job of that, these days (and I'm sure there are others). I just can't see myself writing to a totally different (non-standard) set of APIs when we finally have a standard that works really well.