If a JAX-RS implementation is bundled it can break JAX-RS for other deployments

The JAX-RS API uses a service loader pattern to locate the actual implementation, which is then cached in static values.

Unfortunately the TCCL is used, which results in the deployments CL to be used to load the impl. This means that if a JAX-RS impl is bundled, it's classes will be used for all deployments, rather than using resteasy.