I have about 30 tables that I need to fill from an XML file. And I want to use JPA for that purpose.
Now I have 30 classes annotated with @Entity
, config that scans entities and repositories;
Also I have:
@Repository
public interface MyRepository extends JpaRepository<MyEntity1, Long> {
}
And (some controller):
@Autowired
public MyRepository myRepository;
...
...
MyEntity1 entity = new MyEntity(...);
myRepository.save(entity);
It works fine with one @Entity
but should I define 30 repositories for that?
I thought I could do something like this:
@Repository
public interface MyRepository<T> extends JpaRepository<T, Long> {
}
and then:
@Autowired
public MyRepository<MyEntity1> myRepository1;
@Autowired
public MyRepository<MyEntity2> myRepository2;
but that gave an error:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myRepository1': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class java.lang.Object
Unfortunately you can't do this and you will have to write 30 separate repositories. You can however write generic repositories when the entities share a single table inheritance. (See the answer to Using generics in Spring Data JPA repositories )
What your code is trying to do is make a repository where the shared inheritance is on the class Object which isn't an @Entity hence the exception.
Also an additional minor note, you don't need to annotate your repositories with @Repository. Spring data automatically registers these as beans if it is configured correctly.
Try this approach:
Base class for all entities :
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class BaseEntity {
@Id
@GeneratedValue(strategy = GenerationType.TABLE)
private Long id;
}
Entities :
@Entity
public class Entity1 extends BaseEntity {
private String name;
}
@Entity
public class Entity2 extends BaseEntity {
private String name;
}
A common repo :
public interface BaseEntityRepo extends JpaRepository<BaseEntity, Long> {
}
Usage :
public class BaseEntityRepoTest extends BaseTest {
@Autowired
private BaseEntityRepo repo;
@Test
public void baseEntityTest() throws Exception {
BaseEntity entity1 = new Entity1("entity1");
BaseEntity entity2 = new Entity2("entity2");
repo.save(entity1);
repo.save(entity2);
List<BaseEntity> entities = repo.findAll();
assertThat(entities).hasSize(2);
entities.forEach(System.out::println);
}
}
As far as I am aware what you are trying is not possible. Spring Data JPA needs an interface per Entity type for its repositories, Because Spring Data JPA will be creating the query implementations .
So it is advised that you have a Repository per Entity as it will allow you to add complex findByXXX
methods in the future also.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.