How can I use JSR-299 CDI to inject (not annotated) beans from external libraries?
Examples:
Interface X and its implementations come from a third party lib. How can I decide which implementation to use?
class A {
@Inject
private X x;
}
What if I had several classes using the X interface but different implementations?
class A {
@Inject
private X x; // should be XDefaultImpl
}
class B {
@Inject
private X x; // should be XSpecialImpl
}
Use producers:
public class ClassInABeanArchive {
@Produces @SpecialX public X createSpecialX() {
return new XSpecialImpl();
}
@Produces @DefaultX public X createDefaultX() {
return new XDefaultImpl();
}
}
You will have to define the @SpecialX and @DefaultX qualifiers. and use them together with @Inject:
@Qualifier
@Retention(..)
@Target(..)
public @interface SpecialX {}
If you don't need to differentiate two implementations, skip the qualifiers part.