Declare @Inject as concrete implementation of @Produces returned interface

Question

Is there any way to inject a concrete implementation of @Produces returned interface?

SomeClassImpl implements SomeClass {
    public Integer iField;
}

Producer class:

@Produces
public SomeClass produceChild(){
    SomeClassImpl impl = new SomeClassImpl();
    impl.iField = 17;
    return impl;
}

Consumer class:

@Inject SomeClassImpl classImpl;

EDIT

The attempt to @Inject SomeClassImpl doesn't force container to use the @Produces method that returns super-type SomeClass.

Why it is possible to inject child-type via @Inject parent-type (without Producer), but no variants inject child-type via @Produces parent-type ?

Use [qualifiers](https://docs.oracle.com/javaee/6/tutorial/doc/gjbck.html) if you have more than one implementation of an interface — ares, May 15 '16 at 14:14
See [this answer](http://stackoverflow.com/questions/22982422/cdi-ambiguous-dependency-with-produces-why). — blacktide, May 15 '16 at 14:24
In regards to your edit, because your `@Produces` method produces a `SomeClass` instance, not a `SomeClassImpl` instance, which could return any implementation of `SomeClass`, not just `SomeClassImpl` instances. You can fix it by injecting `SomeClass` (not the implementation) and using a qualifier, or by modifying your `@Produces` method to return `SomeClassImpl`. — blacktide, May 15 '16 at 19:31
I got it, thanks, but i need to inject exactly SomeClassImpl type via Produces method. If its not possible - tell me please "This is not possible!" =)) — uptoyou, May 15 '16 at 19:39

score 1 · Accepted Answer · answered May 15 '16 at 22:16

1

You can use @Typed to control what the valid types are for your bean. https://docs.jboss.org/cdi/api/1.0/javax/enterprise/inject/Typed.html

answered May 15 '16 at 22:16

John Ament

1 Answers1