springboot-jpa | springboot-jpa with docker | Continuous Deployment library

You can not use Collection, Map, Array or enumeration as @JsonBackReference .

Refer the link : https://fasterxml.github.io/jackson-annotations/javadoc/2.2.0/com/fasterxml/jackson/annotation/JsonBackReference.html.

Try interchanging @JsonBackReference and @JsonManagedReference. It should work.

You cannot override the id in an inheritance hierarchy.

So the primary key @Id is always defined in the parent class.

Yes, ok I forgot the slash in the endpoint

this.mvc.perform(get("/items").accept(MediaType.APPLICATION_JSON)).andExpect(status().isOk());

simple comment instead of downvote would suffice imho

I am junior with REST , but my advice would be : Create CartServices class . Controller only to transfer data to Services. Use @transactional annotations. It is hard to read . I wrote very similar Application : IF you want to check : https://github.com/justassub/ShopProject/tree/master/RESTserver/src/main/java/lt/it/akademija Sorry , it was my first application and not everything was in english. BUT IT IS VERY SIMILAR - only Cart - users.

When you wrote :

You can just remove the reference back to the Cart completely and make the complete relationship go just in one direction by dropping the mappedBy="cart" part from the @OneToMany annotation.

If you still want the cart_id in the item you can set it using java code on the Cart.

Of course, all this begs the question: Why do you want this behavior which is very un-JPA-ish. If you create another question stating your original question/concern it seems likely that there is something to learn about JPA.