9 Replies Latest reply on Feb 15, 2017 7:21 AM by gprade

    @Inject CDI Wildfly 10 with interfaces doesn`t seem to work like it used to in previous versions of JBoss AS7

    amostech
    amostech Aug 3, 2016 11:50 PM

      Good evening,

      I finally decided to move to Wildfly 10 in order to get hands on the new features of Java EE 7 and all the cool stuff that has been developed in this project. But it turns out that I bumped into a problem that is kind of making me feel confused about the ways things work here.

       

      The problem:

           Caused by: org.jboss.weld.exceptions.DeploymentException: WELD-001408: Unsatisfied dependencies for type FriendRequestDaoImpl with qualifiers @Default

       

      The cause:

           Whenever I try to inject a bean that implements an interface this error occurs.

       

      Example that works:

       

      @Stateless
public class FriendRequestDaoImpl extends GenericDaoImpl<FriendRequest> {

    @Inject
    private EntityManager em;
    
    public FriendRequestDaoImpl() {
    }
    
  public List<FriendRequest> findFriendRequestByReceiver(Long receiverId) {
     // IMPLEMENTATION OF METHOD...     
  }
    
}

      Example that won't work and generate the exception I mentioned above:

       

       

      @Stateless
public class FriendRequestDaoImpl extends GenericDaoImpl<FriendRequest> implements FriendRequestDao {

    @Inject
    private EntityManager em;
    
    public FriendRequestDaoImpl() {
  }
    
  public List<FriendRequest> findFriendRequestByReceiver(Long receiverId) {
     // IMPLEMENTATION OF METHOD...     
  }
    
}

       

       

      You see? The only difference between the example that works and the one that doesn`t is that the latter implements the FriendRequestDao interface which has the following structure:

       

      @Local
public interface FriendRequestDao extends GenericDao<FriendRequest> {

 /** Specializations...*/
   public List<FriendRequest> findFriendRequestByReceiver(Long receiverId);
}

       

      The GenericDao interface is as follows:

       

      
public interface GenericDao<T> {

  T register(T t);

  void delete(Object id);

  T find(Object id);

  T update(T t);

}

       

      It seems to me that when the Inheritance structure gets a little complicated WELD cannot understand how to instantiate the beans anymore, would that make sense?

       

      Do I correctly understand the way CDI and injection is supposed to work in Wildfly 10? I am pretty sure this structure used to work back when we used JBoss AS 7 and Java EE6.

       

      Thank you very much! =)

      Arthur