I want to avoid creating a new org.jboss.resteasy.client.jaxrs.ResteasyClient 3.0.9when my Service method gets called; so I want to set it as member variable in the Service class. Therefore, I'd want to know if ResteasyClient threadsafe.
No. By default, the ResteasyClient is not thread safe because of its underlying HTTP dependencies. RESTEasy Client Proxy Overhead? has a way to create a client in a threadsafe way.