If we have a resource class like this:

public class UserResource {
 private long id;
 private long accountId;
 private String name;
}

If we want to populate id and name fields from JSON and accountId from request param, this doesn't work:

@Post("/accounts/{user.accountId}
@Consumes("application/json")
public void addUser(User user) {
//user.getAccountId() will be null
}

I believe that we should deserialize the class from the JSON and if there is any path param, we should override the value in the deserialized resource.