How to persist a new entity containing multiple identical instances of another unpersisted entity with spring-boot and JPA?

Question

Overview:

I\'m building a spring-boot application which, in part, retrieves some entities from an external REST service and compares it to previous vers

Answer 1

After days of search, I finally solved this in my spring boot project.

Add follwing blocks in the application.yaml file:

  jpa:
    properties:
      hibernate:
        enable_lazy_load_no_trans: true
        event:
          merge:
            entity_copy_observer: allow