Is it possible to set ETags using JAX-RS without resorting to Response objects?

Question

In one of the few questions (with answers) I have found on SO regarding JAX-RS and caching, the answer to generating ETags (for caching) is by setting some values on the Respons

Answer 1

You might consider using a Response Filter for that. I developed a smell library doing exactly what you are looking for: https://github.com/tobilarscheid/jaxrs-etag-filter