Question

I have an interface

public interface ParentService{}

And Two Implementation Class

@Service("child1service")    
public class Child1 implements ParentService{}

@Service("child2service")
public class Child2 implements ParentService{}

Now my Controller

public class ServeChild1Controller extendds AbstractController{

 @Autowired
 public ServeChild1Controller(@Qualifier("child1service") ParentService child1service){
 super(child1service)
  } 

Similarly there is ServeChild2Controller..

So when i run I get the following error

Error for ServeChild1Controller: No unique bean of type [com.service.ParentService] is defined: expected single matching bean but found 2 child1service, child2service

Am trying to read more about these Annotations but not able to resolve it ..
Any pointers will be of help
Thanks

Answer 1

In order to use a specific instance you need to provide Annotate the service with @Qualifier(id) and in the constructor anotate the parameter with @Qualifier again, as follows:

@Service("child1service")
@Qualifier("child1service")
public class Child1 implements ParentService{}

@Service("child2service")
@Qualifier("child2service")
public class Child2 implements ParentService{}

And you constructor:

public class ServeChild1Controller extendds AbstractController{

    @Autowired
    public ServeChild1Controller(@Qualifier("child1service") ParentService child1service){
        super(child1service)
    }

}