I have 2 classes (B,C) extends class A.

@Service
public class A  extends AbstratClass<Modele>{

    @Autowired
    A(MyClass  br) {
        super(br);
    }


@Service
public class B  extends A{

  @Autowired
  B (MyClass  br) {
     super(br);
  }



@Service
public class C  extends A{

  @Autowired
  C (MyClass  br) {
     super(br);
  }

But i have this message:

No unique bean of type [A] ] is defined: expected single matching bean but found 2: [A, B, moveModeleMarshaller]

I really cant get why i have this message & how to resolve even after reading Spring documentation.

Thanks in advance.