Spring PropertySourcesPlaceholderConfigurer不对@Value使用自定义PropertySource

我一直在尝试获取在Spring Application中运行的自定义PropertySource的非常基本的示例。

这是我的PropertySource：

public class RemotePropertySource extends PropertySource{
    public RemotePropertySource(String name, Object source) {
        super(name, source);
    }

    public RemotePropertySource(String name) {
        super(name);
    }

    public Object getProperty(String s) {
        return "foo"+s;
    }
}

它通过ApplicationContextInitializer添加到ApplicationContext中：

public class RemotePropertyApplicationContextInitializer implements ApplicationContextInitializer<GenericApplicationContext> {
    public void initialize(GenericApplicationContext ctx) {
        RemotePropertySource remotePropertySource = new RemotePropertySource("remote");
        ctx.getEnvironment().getPropertySources().addFirst(remotePropertySource);
        System.out.println("Initializer registered PropertySource");
    }
}

现在，我创建了一个简单的单元测试，以查看PropertySource是否正确使用：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = RemotePropertySourceTest.ContextConfig.class, initializers = RemotePropertyApplicationContextInitializer.class)
public class RemotePropertySourceTest {

    @Autowired
    private UnderTest underTest;

    @Autowired
    Environment env;

    @Test
    public void testContext() {
        assertEquals(env.getProperty("bar"),"foobar");
        assertEquals(underTest.getFoo(),"footest");
    }


    @Component
    protected static class UnderTest {
        private String foo;

        @Autowired
        public void setFoo(@Value("test")String value){
            foo=value;
        }

        public String getFoo(){
            return foo;
        }
    }

    @Configuration
    @ComponentScan(basePackages = {"test.property"})
    protected static class ContextConfig {
        @Bean
        public static PropertySourcesPlaceholderConfigurer propertyConfigurer() {
            PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
            return configurer;
        }

    }
}

通过环境访问该值可以得到正确的结果（“ foobar”），但是使用@ Value-Annotation失败。据我在文档中阅读的内容，Configuration中的PropertySourcesPlaceholderConfigurer应该会自动从环境中提取PropertySource，但显然不会。我有什么想念的吗？

我知道最好通过环境显式访问属性，但是现有应用程序经常使用@ Value-Annotations。

任何帮助是极大的赞赏。谢谢！