CDI Ambiguous dependencies

Question

I have a @SessionScoped @Named bean with a @Producer method for a user object:

@Named @SessionScoped
public class UserBean implements Serializable
{
  //...
  @Named @Produces @LoggedIn @SessionScoped
  public MyUser getCurrentUser() {return user;}
}

This works fine in my setup (JBoss-7.1.1-Final) and it's no problem to access the user fields from JSF pages with #{currentUser.name}. The qualifier is org.jboss.seam.security.annotations.LoggedIn. Now I want to @Inject this user in a field in another @Named Bean:

@Named
public class FavBean implements Serializable
{   
  private @Inject @LoggedIn MyUser currentUser;
}

This gives me the error:

org.jboss.weld.exceptions.DeploymentException:
WELD-001409 Ambiguous dependencies for type [MyUser] with qualifiers [@Default] at
  injection point [[field] @Inject @LoggedIn test.FavBean.currentUser].
Possible dependencies [[Managed Bean [class test.ejb.MyUser] with qualifiers
  [@Any @Default],
Producer Method [MyUser] with qualifiers [@Any @Default] declared as [[method]
  @Named @Produces @LoggedIn @SessionScoped public test.UserBean.getCurrentUser()]]]

I don't understand the first dependency Managed Bean [class test.ejb.MyUser] This class is a simple @Entity and deployed in an ebb.jar in a EAR. As a workaround I'm currently injecting the UserBean get the user from there.

Answer 1

This is because CDI searches for beans by type and your entity and the producer method return the same type. That's why it is ambiguous.

You need to define a new qualifier and annotate it with your producer method.

@Qualifier
@Retention(RUNTIME)
@Target({METHOD, FIELD, PARAMETER, TYPE})
public @interface CurrentUser {
}

Add this annotation to your producer method:

@Named @Produces @CurrentUser @LoggedIn @SessionScoped
public MyUser getCurrentUser() {return user;}