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我使用ResourceBundle接口创建了一个类，如下所示。这个类依赖于另一个类。ResourceBundle的实现类（如下所示的问卷源）总是有null作为依赖项。无论我使用setter还是构造函数注入。有人能帮我解决这个问题吗？我这里缺少一些配置。

@Component
public class QuestionnaireSource extends ResourceBundle {

    private final QuestionnaireCache questionnaireCache;

    private static final Object lockObject = new Object();

    @Override
    protected Object handleGetObject(String key) {
//        Gets an object for the given key from this resource bundle.
//        Returns null if this resource bundle does not contain an object for the given key 0
        Object value = null;
        try {
            value = getString(key, LocaleContextHolder.getLocale());
        } catch (Exception ignored) {
        }
        return value;
    }

    public Questionnaire getString(String key, Locale locale) {
        Locale l = safeLocale(locale);
        return getResources(l).get(key);
    }

    private Locale safeLocale(Locale l) {
        if (l.getLanguage().equalsIgnoreCase("DE")) {
            return Locale.GERMAN;
        } else {
            return Locale.ENGLISH;
        }
    }

    protected Map<String, Questionnaire> getResources(Locale locale) {
        synchronized (lockObject) {
            return questionnaireCache.getQuestionnaireCache().get(locale.getLanguage().toUpperCase());
        }
    }

    @Override
    public Enumeration<String> getKeys() {
        return null;
    }

    public QuestionnaireSource(QuestionnaireCache questionnaireCache) {
        super();
        this.questionnaireCache = questionnaireCache;
    }
}

• • 更新：**我发现即使是resourceBundle中简单的依赖注入也会失败。
• • UPdate2：**我在主类中使用的方法如下：

//        ResourceBundle test here
    System.out.println("Test here for resource bundle");
    Locale locale = new Locale("de", "DE");
    ResourceBundle bundle = ResourceBundle.getBundle("com.app.util.QuestionnaireSource", locale);
    System.out.println(bundle.getString("some.test.string"));

• • 更新3**

我写了一个简单的例子来表达这种情况：

• • 某些服务类别**

@Service
public class SomeServiceTest {

    public String testMethod(){
        return "test here and complete";
    }
}

• • 资源包的一些示例实现**

@Component
public class MyResourceBundle extends ResourceBundle  {

    private final SomeServiceTest someServiceTest;

    @Autowired
    public MyResourceBundle(SomeServiceTest someServiceTest) {
        this.someServiceTest = someServiceTest;
    }

    @Override
    protected Object handleGetObject(String key) {
        if(key.equals("test"))
            return "test";
        return null;
    }

    @Override
    public Enumeration<String> getKeys() {
        return null;
    }
}

• • 主要. java**

main(){
//        ResourceBundle test here
        System.out.println("Test here for resource bundle");
        Locale locale = new Locale("de", "DE");
        ResourceBundle bundle = ResourceBundle.getBundle("com.app.util.MyResourceBundle", locale);
        System.out.println(bundle.getString("test"));

}

• • Update4：**我修改了https://www.baeldung.com/spring-inject-bean-into-unmanaged-objects文章中提到的类的注解，但是SomeServiceTest类的依赖注入仍然是空的。修改如下所示。
• • 某个服务测试. java**

@Service
public class SomeServiceTest {

    public String testMethod(){
        return "test here and complete";
    }
}

• • 我的资源包. java**

@Configurable
public class MyResourceBundle extends ResourceBundle  {

    @Autowired
    private  SomeServiceTest someServiceTest;

    public MyResourceBundle() {
    }

    @Override
    protected Object handleGetObject(String key) {
        if(key.equals("test"))
            return someServiceTest.testMethod();
        return null;
    }

    @Override
    public Enumeration<String> getKeys() {
        return null;
    }
}

SomeServiceTest类仍为空。