无法使用 @Lookup 注释在单例 bean 中的原型范围内自动装配 bean

我创建了下面的类和接口，但原型 bean 构造函数没有被调用。我正在使用 @Lookup 来创建原型作用域 bean。

public interface IProtoTypeBean {}

@Component
@Scope(value = "prototype")
public class ProtoTypeBean implements IProtoTypeBean {

    public ProtoTypeBean() {
        super();
        System.out.println("ProtoTypeBean");
    }
}

@Component
public class SingleTonBean {

    IProtoTypeBean protoTypeBean = getProtoTypeBean();

    @Lookup
    public ProtoTypeBean getProtoTypeBean(){
        return null;
    }

    public static void main(String[] args) {
        ApplicationContext ctx = new AnnotationConfigApplicationContext(SingleTonBean.class);
        SingleTonBean s1 = ctx.getBean(SingleTonBean.class);
        IProtoTypeBean p1 = s1.protoTypeBean;
        SingleTonBean s2 = ctx.getBean(SingleTonBean.class);
        IProtoTypeBean p2 = s2.protoTypeBean;
        System.out.println("singelton beans " + (s1 == s2));

        // if ProtoTypeBean constructor getting called 2 times means diff objects are getting created
    }

}