使用Java Config配置Spring Data JPA定制存储库impl

Question

I'm using Spring Boot and Spring Data JPA. I want to create a custom repository method, as described in the reference. I need a reference to the EntityManager in the custom method. When the CustomRepositoryImpl class has an @Autowired/@Inject field, it works fine. What I would like to do is to have this bean configured using JavaConfig. Is this possible? My attempts have been failing so far, here is my code:

public interface CustomerRepositoryCustom {

    void resetAll();
}

public class CustomerRepositoryImpl implements CustomerRepositoryCustom {

    //    @Inject
    private EntityManager em;

    public CustomerRepositoryImpl(EntityManager em) {
        this.em = em;
    }

    @Transactional
    @Override
    public void resetAll() {
        // some code
    }
}

In my @SpringBootApplication class, which is by definition a @Configuration class, I have a @Bean definition like this one:

@Bean
public CustomerRepositoryCustom customerRepositoryCustom(EntityManager em) {
    return new CustomerRepositoryImpl(em);
}

This doesn't work, this method is completely ignored, and I get the following exception:

Caused by: java.lang.NoSuchMethodException: test.CustomerRepositoryImpl.<init>()

ie Spring Data doesn't look at the @Bean definition, it just tries to create the custom repo bean itself with the default constructor, which doesn't exist.

Is it possible to instruct Spring Data to use the @Bean method?

Answer 1

The issue I think is the name of the bean, it should be named customerRepositoryImpl which in the case of JavaConfig it is not, if you change the javaconfig to this, it should work:

@Bean
public CustomerRepositoryCustom customerRepositoryImpl(EntityManager em) {
    return new CustomerRepositoryImpl(em);
}

Answer 2

Have you tried?

@Repository
class MyCustomerRepo implements CrudRepository<User,Long>, CustomerRepositoryCustom{
}
class CustomerRepositoryCustomImpl implements CustomerRepositoryCustom{
private EntityManager em;

@Inject
public CustomerRepositoryImpl(EntityManager em) {
    this.em = em;
}

@Transactional
@Override
public void resetAll() {
    // some code
}
}

also remove your @bean definition

edit:

@autowired
EntityManager em;

@Bean
public CustomerRepositoryCustom customerRepositoryCustom() {
    return new CustomerRepositoryImpl(em);
}