RepositoryEntityController.patchItemResource(…) triggered an additional, unnecessary lookup of the original entity to be updated. However the resolution algorithm for PersistentEntityResource already checks the presence and rejects an invalid identifier with a ResourceNotFoundException.
PersistentEntityResource now carries a boolean flag to expose whether the entity is about to be created. That allows us to avoid the additional lookup in the method handling PUT requests, too.
Related tickets: DATAREST-441.
006c8b777a