自动装配的XStreamMarshaller丢失unknownFieldsToIgnore设置

Question

我们在Spring Boot应用程序中定义了一个XStreamMarshaller作为@Bean。

@SpringBootApplication
public class MyApplication extends WebMvcConfigurerAdapter {
    // ...

    @Bean
    public XStreamMarshaller xStreamMarshaller() {
        XStreamMarshaller xStreamMarshaller = new XStreamMarshaller();
        Class<?>[] annotatedClasses = { MyAnnotatedClass.class };
        xStreamMarshaller.setAnnotatedClasses(annotatedClasses);
        NameCoder nameCoder = new XmlFriendlyNameCoder();
        xStreamMarshaller.setNameCoder(nameCoder);
        xStreamMarshaller.getXStream().ignoreUnknownElements();

        return xStreamMarshaller;
    }
}

它自动装入JUnit测试：

@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
@ContextConfiguration(classes = { MyApplication.class })
public class MyAnnotatedClassTest {
    @Autowired
    private XStreamMarshaller xStreamMarshaller;

    // ...
}

在调试器中检查它时，构造它时xStreamMarshaller.xstream.fieldAliasingMapper.unknownFieldsToIgnore = [.*]

检查自动装配的实例（具有相同的对象ID）时，xStreamMarshaller.xstream.fieldAliasingMapper.unknownFieldsToIgnore = []

为什么它会丢失unknownFieldsToIgnore设置以及如何强制保留该设置？

修改

Per @indyaah，我已将bean定义移到：

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = { "my.application" })
public class MvcConfiguration extends WebMvcConfigurerAdapter {
    // ...

    @Bean
    public XStreamMarshaller xStreamMarshaller() {
        XStreamMarshaller xStreamMarshaller = new XStreamMarshaller();
        Class<?>[] annotatedClasses = { MyAnnotatedClass.class };
        xStreamMarshaller.setAnnotatedClasses(annotatedClasses);
        NameCoder nameCoder = new XmlFriendlyNameCoder();
        xStreamMarshaller.setNameCoder(nameCoder);
        xStreamMarshaller.getXStream().ignoreUnknownElements();

        return xStreamMarshaller;
    }
}

并使我的Spring Boot Application文件非常薄：

@SpringBootApplication
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

这仍然具有与重构之前相同的行为。