Dao configuration for JPA and spring: Could not autowire field

[danilodelizia]

Hello,
I'm trying to configure a DAO structure in my application so I created a generic Dao interface:

public interface Dao<E, K> {
    public void persist(E entity);
    public void remove(E entity);
    public E findById(K id);
}

I implemented the Specific Dao for an entity:

public interface DaoRole extends Dao<Role, Integer>{
//some other specific DAO method for Role entity
}

Then I created a specific Dao implementation for JPA:

public abstract class JpaDao <E, K> implements Dao<E, K> {
	protected Class<E> entityClass;

	@PersistenceContext
	protected EntityManager entityManager;
 
	public JpaDao() {
		ParameterizedType genericSuperclass = (ParameterizedType) getClass().getGenericSuperclass();
		this.entityClass = (Class<E>) genericSuperclass.getActualTypeArguments()[0];
	}
 
	@Transactional
	public void persist(E entity) { entityManager.persist(entity); }
	public void remove(E entity) { entityManager.remove(entity); }
	public E findById(K id) { return entityManager.find(entityClass, id); }
}

And a the end my specific implementation for JPA DAO for Role entity:

@Repository
public class JpaDaoRole extends JpaDao<Role, Integer> implements DaoRole {
 	//implementation of the methos in DaoRole
}

So I created a Junit test to test the application that contains an autowired field:

@Autowired
public JpaDaoRole dr;

But when I launch the application I get an error:

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.windy.spring.JpaDaoRole] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

The strange thing is that if I implement all the methods in the JPADaoRole class everything works perfectly and the field can be autowired. I think the problem is caused by the Dao structure I'm using... any help on how to solve this problem?

Thanks in advance for your help.
Danilo

[danilodelizia]

I just found the solution.

I should have autowired the generic implementation:

@Autowired
public DaoRole dr;