How to use generics with JpaRepository of spring data jpa

Question

//generic repo
public interface MyGenericRepo extends JpaRepository<GenericEntity,Integer> { }

//entity
class Place extends GenericEntity {
    private Event event;
}

//entity
class Event extends GenericEntity{  }

//entity
class Offer extends GenericEntity
{
    private Place place;
}

//entity
class User extends GenericEntity {
    private Place place;
}

what should I take in GenericEntity and how to create a ModelManager to save and load entities

yes its similar but how to create service please – Feroz Mujawar Jun 11 '18 at 09:48 — Feroz Mujawar, Jun 11 '18 at 09:48

score 3 · Answer 1 · answered Jun 11 '18 at 09:23

3

If you wan't create your own repository interface with Integer as a key. You have to difine:

@NoRepositoryBean
public interface MyGenericRepo<T> extends JpaRepository<T, Integer> {
}

annotation @NoRepositoryBean is needed to avoid creation of Repository implementation. You can read more on https://stackoverflow.com/a/11585811/3058413.

After it you should difive interface for each entity:

public interface PlaceRepository extends MyGenericRepo<Place> {

}

Spring data automatically will create implementation of this repostory.

answered Jun 11 '18 at 09:23

eugene-karanda

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i dont want to create repository per entity – Feroz Mujawar Jun 11 '18 at 10:50
You cannot generify entity class cause spring won't be able to terminate with entity it must use. – eugene-karanda Jun 11 '18 at 10:59
if any example please – Feroz Mujawar Jun 11 '18 at 11:49

How to use generics with JpaRepository of spring data jpa

1 Answers1