java - How to use spring Repository without @Id?

Question

I'm using spring CrudRepository throughout my application. Now I want to also create one for an @Entity that does not have an @Id. Is that possible at all?

//probably ID is always required?
public interface Repository<T, ID extends Serializable>

Answer 1

JPA requires that every entity has an ID. So no, entity w/o an ID is not allowed.

Every JPA entity must have a primary key.

from JPA spec

You may want to read more about how JPA handles a case when there's no id on the DB side from here (see 'No Primary Key').