Spring 启动两个对象映射器 bean

Question

我想在我的 Spring boot 项目中创建两个 Hibernate 感知对象映射器 bean。

一个 bean 强制延迟加载，另一个 bean 强制延迟加载设置为 false。我的bean定义如下:

我创建了一个 HibernateAwareObjectMapper类(class)

public class HibernateAwareObjectMapper extends ObjectMapper {
}

和

@Configuration
public class CrewuiserCorebeans extends WebMvcConfigurerAdapter {

@Bean
public PasswordEncoder passwordEncoder() {
    return new BCryptPasswordEncoder();
}

@Bean
public ObjectMapper defaultObjectMapper() {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    Hibernate5Module hibernate5Module = new Hibernate5Module();
    hibernate5Module.configure(Hibernate5Module.Feature.FORCE_LAZY_LOADING, true);
    objectMapper.registerModule(hibernate5Module);
    return objectMapper;
}

@Bean
public HibernateAwareObjectMapper hibernateAwareObjectMapper() {
    HibernateAwareObjectMapper objectMapper = new HibernateAwareObjectMapper();
    objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    Hibernate5Module hibernate5Module = new Hibernate5Module();
    hibernate5Module.configure(Hibernate5Module.Feature.FORCE_LAZY_LOADING, false);
    objectMapper.registerModule(hibernate5Module);
    return objectMapper;
}


@Override
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
    argumentResolvers.add(new UserContextResolver());
}

}

当我运行应用程序时，出现以下错误:

Parameter 0 of method mappingJackson2HttpMessageConverter in org.springframework.boot.autoconfigure.web.JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration required a single bean, but 2 were found:
- defaultObjectMapper: defined by method 'defaultObjectMapper' in class path resource [com/crewuiser/core/configuration/CrewuiserCorebeans.class]
- hibernateAwareObjectMapper: defined by method 'hibernateAwareObjectMapper' in class path resource [com/crewuiser/core/configuration/CrewuiserCorebeans.class]

org.springframework.boot.autoconfigure.web.JacksonHttpMessageConvertersConfiguration在 jar 里，所以我不能添加 @Qualifier注解。

请帮忙，如果我在这里遗漏了什么。我怎样才能让它工作？

Answer 1

我找到了解决办法。

我加了 @Primary到其中一个 bean 并使用 @Qualifier在我的其他类中，非主要 bean 需要 @Autowired .

@Bean
@Primary
public ObjectMapper defaultObjectMapper() {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    return objectMapper;
}

在我的服务课上。

@Autowired
public OrganisationService(OrganisationValidator organisationValidator, OrganisationAuthority organisationAuthority,
                           OrganisationHelper organisationHelper, OrganisationRepository organisationRepository,
                           @Qualifier("hibernateAwareObjectMapper") ObjectMapper hibernateAwareObjectMapper) {}