I know that RESTEasy 3.x uses JAX-RS 2.0. Which versions of RESTEasy correspond to JAX-RS 1.0, 1.1 and 1.1.1?
According to Bill's blog (Bill Burke is one of the main RESTEasy creators):
There is no JAXRS 1.1.1 specification as per JSR 311, though surprisingly you can find JAXRS 1.1.1 API with updates to JAXRS 1.1. API.