Section 11.2.7 of the JAX-RS 2.1 spec states,
"Note that if JSON-B and JSON-P are both supported in the same
environment, entity providers for JSON-B take precedence over
those for JSON-P for all types except JsonValue and its sub-types."

The sub-types of JsonValue are JsonArray, JsonNumber, JsonObject,
JsonString, JsonStructure. Resteasy's JSON-P providers currently
supports this.

Currently I don't see that we manage the builtin providers by priority and
and with the requirement above we may need to. We need to made sure the
JSON-P providers are checked before the JSON-B provider. In addition
currently a JSON-B object must be annotated with NoJackson so that our
Jackson implementation does not process the object first.