Autowired环境PropertySourcesPlaceholder始终为空

Question

@Configuration
@ComponentScan
@PropertySource("classpath:tests.properties")
public class SomeConfig {

    @Value("${platformVersion}")
    private String platformVersion;

    @Resource
    private Environment environment;

    @Bean
    public static PropertySourcesPlaceholderConfigurer propertyConfig() {
       return new PropertySourcesPlaceholderConfigurer();
    }
}

platformVersion和environment始终为空。在日志中：添加[class path resource[tests.properties]]PropertySource以最低的搜索优先级。我看到stackoverflow上的其他帖子（Autowired Environment是空的），我不想去实现EnvironmentAware。为环境而将私人改为公共并不能解决问题。任何其他想法都欢迎！