Now we have multiple REST annotations to be added on method parameters (@Part, Field, @Path) and more to come (@QueryParam, @QueryMap). But we do not have a dedicated annotation for the request body. Currently we are assuming that if the one method parameter not annotated with anything is the request body. This is complicated in the validation and generation code, and also confusing in the client-side annotated code.

We should have a dedicated @Body annotation and require annotations on all method parameter in REST methods.