Herança e a DAO | Java e JPA: consultas avançadas, performance e modelos complexos

Oi Herbert,

Usando herança é bem comum ver algo assim:

public interface BaseDao<EntityType extends Object>
{
   public Serializable save(EntityType entity) throws DataAccessException,
        HibernateException;

   public void merge(EntityType entity) throws DataAccessException,
        HibernateException;

   public void flush() throws DataAccessException,HibernateException;
}

@Repository
public abstract class BaseDaoImpl<EntityType extends Object> implements BaseDao<EntityType>{
 // Implementation for baseDao methods 
}

 @Repository
public class EmpDaoImpl extends BaseDaoImpl<Employee> implements EmpDao{
 // Implementation
}