Question

Why do I need to release the ClientResponse with:

 response.releaseConnection();

Is there an advantage? Why doesnt RestEasy handle this?

Sometimes I have to release it, sometimes I havnt – whats the condition?

Answer 1

Resteasy will release the connection under the covers. The only
counterexample is the case in which the response is an instance of
InputStream, which must be closed explicitly.

You can read more about this in the RESTEasy documentation.