我的服务bean在构造函数中设置了两个公共字段：

@Service
public class MyService {
    private static final Logger log = LoggerFactory.getLogger(MyService.class);

    public Boolean nativeHome;
    public String url;

    @Autowired
    public MyService(
            @Value("${homepage.native}") Boolean nativeHome,
            @Value("${homepage.url}") String url) {
        this.nativeHome = nativeHome;
        this.url = url;
        log.debug(this.nativeHome + ""); // not null
        log.debug(this.url); // not null
    }
}

此bean通过其构造函数注入控制器组件：

@RestController
public class MyController {
    private static final Logger log = LoggerFactory.getLogger(MyController.class);

    private MyService myService;

    @Autowired
    public MyController(MyService myService) {
        this.myService = myService;
        log.debug(this.myService.nativeHome + ""); // null
        log.debug(this.myService.url); // null 
    }
}

spring引导日志以及logger调试消息表明，这两个字段在servicebean中设置正确，但它们是错误的 null 在控制器bean中：

15:47:44.397 [main] DEBUG c.r.spring.service.MyService.<init>(40) - false
15:47:44.397 [main] DEBUG c.r.spring.service.MyService.<init>(41) - http://...
[...]
15:47:46.160 [main] DEBUG c.r.s.controller.MyController.<init>(34) - null
15:47:46.160 [main] DEBUG c.r.s.controller.MyController.<init>(35) - null

如果我将这两个字段声明为 private 并在控制器中使用getter，则这两个字段不是 null 不再。为什么会这样？
我带来了完整的项目设置的完整性，即使它可能不相关的问题。
Spring版本：5.2.8.0
春根 applicationContext.xml ```

<context:annotation-config />

<aop:aspectj-autoproxy />

<context:component-scan base-package="c.r.spring">
    <context:exclude-filter type="regex" expression="c\.r\.spring\.controller.*"/>
</context:component-scan>

<import resource="classpath:spring/spring-jdbc.xml" />

<mvc:annotation-driven>
    <mvc:path-matching trailing-slash="true" />
</mvc:annotation-driven>

<mvc:default-servlet-handler />

<mvc:cors>
    <mvc:mapping path="/**"
        allowed-origins="http://devel.r.com:3000"
        allowed-methods="GET, POST, PUT, DELETE, OPTIONS"
        allowed-headers="Authorization, Content-Type"
        exposed-headers="Access-Control-Allow-Origin"
        allow-credentials="true" />
</mvc:cors>

<context:component-scan base-package="c.r.spring.controller" />

<bean
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/spring/views/" />
    <property name="suffix" value=".jsp" />
</bean>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring/applicationContext.xml</param-value>
</context-param>

<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>