Spring自定义限定符不起作用

Question

我试图在Spring中处理自定义限定符（4.2.4.RELEASE）。

我有一个界面：

    public interface CompactDisc {
    public void play();
}

和3个实现：

@Component
@Beatles
public class SgtPeppers implements CompactDisc {
    private String title = "Sgt. Pepper's Lonely Hearts Club Band";
    private String artist = "The Beatles";
    public void play() {
        System.out.println("Playing " + title + " by " + artist);
    }
}

@Component
@Metallica
@Metallica1986
public class MasterOfPuppets implements CompactDisc {
    @Override
    public void play() {
        System.out.println("Playing Master Of Puppets by Metallica");
    }
}

@Component
@Metallica
@Metallica1997
public class Fuel implements CompactDisc {
    @Override
    public void play() {
        System.out.println("Fuel by Metallica");
    }
}

我还创建了4个自定义限定符：

@Target({ElementType.CONSTRUCTOR, ElementType.FIELD,
        ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Qualifier
public @interface Beatles {
}

@Target({ElementType.CONSTRUCTOR, ElementType.FIELD,
        ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Qualifier
public @interface Metallica {
}


@Target({ElementType.CONSTRUCTOR, ElementType.FIELD,
        ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Qualifier
public @interface Metallica1986 {
}

@Target({ElementType.CONSTRUCTOR, ElementType.FIELD,
        ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Qualifier
public @interface Metallica1997 {
}

测试类：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = CDPlayerConfig.class)
public class CDPlayerTest {

    @Autowired
    @Metallica
    @Metallica1997
    private CompactDisc cd;

    @Test
    public void cdShouldNotBeNull() {
        assertNotNull(cd);
        cd.play();
    }
}

配置文件：

@Configuration
@ComponentScan
public class CDPlayerConfig {
}

但是当我运行它时，我看到了：

  

org.springframework.beans.factory.NoUniqueBeanDefinitionException：没有   定义[my.spring.CompactDisc]类型的限定bean：expected   单个匹配的bean但发现3：fuel，masterOfPuppets，sgtPeppers

为什么限定词对我不起作用？