自动接线错误弹簧答案

【问题标题】：Autowired error spring自动接线错误弹簧
【发布时间】：2014-08-11 08:12:27
【问题描述】：

我是春天的新手。以前我曾经使用 spring-context xml 配置自动布线。现在我的项目我们直接使用注解来注入bean。

当我尝试自动连接 Mongo 存储库时出现以下异常。

下面是示例代码。

StagingDocumentServiceImpl：

@Service
public class StagingDocumentServiceImpl implements StagingDocumentService {

private static final Logger logger = Logger.getLogger(StagingDocumentServiceImpl.class);
@Autowired
private StagingDocumentRepository stagingDocumentRepository;

/**
 * 
 */
@Override
@Transactional(readOnly = false)
public List<String> saveRawData(Tuple twitter) {

    List<String> tweetIDs = new ArrayList<String>();
    System.out.println("Twitter information get passed.." + twitter);
    Status tweets = (Status) twitter
            .getValueByField(TopologyConstants.TWEETSPOUT_OUT_FIELD);
    //try{
    CIPPayload twitterPayload = DataCaptureTwitterUtil
            .getrawJSONPayloadFromTwitterResponse(tweets);
    String parentID = null;
    System.out.println("twitterPayload"+twitterPayload);
    String tweetParentId = twitterPayload.getContent().getParentContentId();
    /*if (StringUtils.isNotBlank(tweetParentId)) {
        DBObject queryObject = new BasicDBObject();
        queryObject.put("content.id", tweetParentId);
        DBObject resultedData = stagingDocumentRepository.fi
        if (resultedData == null) {
            parentID = getOriginalTweet(tweetParentId);
            tweetIDs.add(parentID);
        }

    }*/

    Test test = stagingDocumentRepository.save(twitterPayload);

    System.out.println("test-->"+test);


    return tweetIDs;
}

StagingDocumentRepository：

 public interface StagingDocumentRepository extends
  MongoRepository<CIPPayload, Serializable> {

 }

问题是我确实知道如何使用 @bean 注释进行配置。

我尝试过如下配置。

毕竟下面的答案我已经改变了配置如下。

但是改变它也不起作用。

@Configuration
public class AppConfig {
    @Bean
    @Bean
    public StagingDocumentRepository stagingDocumentRepository(){
        return new StagingDocumentRepository() {

            @Override
            public <S extends CIPPayload> S save(S entity) {
                // TODO Auto-generated method stub
                return null;
            }

            @Override
            public CIPPayload findOne(Serializable id) {
                // TODO Auto-generated method stub
                return null;
            }

            @Override
            public Iterable<CIPPayload> findAll(Iterable<Serializable> ids) {
                // TODO Auto-generated method stub
                return null;
            }

            @Override
            public boolean exists(Serializable id) {
                // TODO Auto-generated method stub
                return false;
            }

            @Override
            public void deleteAll() {
                // TODO Auto-generated method stub

            }

            @Override
            public void delete(Iterable<? extends CIPPayload> entities) {
                // TODO Auto-generated method stub

            }

            @Override
            public void delete(CIPPayload entity) {
                // TODO Auto-generated method stub

            }

            @Override
            public void delete(Serializable id) {
                // TODO Auto-generated method stub

            }

            @Override
            public long count() {
                // TODO Auto-generated method stub
                return 0;
            }

            @Override
            public Page<CIPPayload> findAll(Pageable pageable) {
                // TODO Auto-generated method stub
                return null;
            }

            @Override
            public <S extends CIPPayload> List<S> save(Iterable<S> entites) {
                // TODO Auto-generated method stub
                return null;
            }

            @Override
            public List<CIPPayload> findAll(Sort sort) {
                // TODO Auto-generated method stub
                return null;
            }

            @Override
            public List<CIPPayload> findAll() {
                // TODO Auto-generated method stub
                return null;
            }
        };
}

输出：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'stagingDocumentServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.biomorf.cip.datacapture.repository.payload.StagingDocumentRepository com.biomorf.cip.datacapture.processing.serviceImpl.StagingDocumentServiceImpl.stagingDocumentRepository; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.biomorf.cip.datacapture.repository.payload.StagingDocumentRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:703) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760) ~[spring-context-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) ~[spring-context-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:691) [spring-boot-1.1.4.RELEASE.jar:1.1.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320) [spring-boot-1.1.4.RELEASE.jar:1.1.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:952) [spring-boot-1.1.4.RELEASE.jar:1.1.4.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:941) [spring-boot-1.1.4.RELEASE.jar:1.1.4.RELEASE]
    at com.biomorf.cip.datacapture.Application.main(Application.java:32) [classes/:na]
       Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.biomorf.cip.datacapture.repository.payload.StagingDocumentRepository com.biomorf.cip.datacapture.processing.serviceImpl.StagingDocumentServiceImpl.stagingDocumentRepository; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.biomorf.cip.datacapture.repository.payload.StagingDocumentRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    ... 15 common frames omitted
       Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.biomorf.cip.datacapture.repository.payload.StagingDocumentRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1103) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:963) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480) ~[spring-beans-4.0.6.RELEASE.jar:4.0.6.RELEASE]

【问题讨论】：

您是否在 bean 配置文件中声明了 StagingDocumentRepository？
没有。我确实知道该怎么做。我以前在 spring-context 文件中做。我确实知道如何使用@Bean 注解进行注入。
试着把它放在你的@Bean, @Qualifier("stagingDocumentRepository")
这是我配置的 @Bean @Qualifier("stagingDocumentRepository") public StagingDocumentRepository stagingDocumentRepository(){ }
Solution to the problem 这个错误主要是由于文件夹结构造成的

标签： java spring autowired spring-data-mongodb

【解决方案1】：

应该是这样的：

@Respository
public interface StagingDocumentRepository extends
MongoRepository<CIPPayload, Serializable> {

}

然后：

@Configuration
@EnableMongoRepositories
public class ThisIsAnAppConfigClass{

   @Bean 
   public StagingDocumentRepository stagingDocumentRepository(){
      return new StagingDocumentRepository();
   }

}

【讨论】：

【解决方案2】：

错误信息

No qualifying bean of type [com.biomorf.cip.datacapture.repository.payload.StagingDocumentRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency.

告诉你 spring 没有找到可以注入到你的 StagingDocumentServiceImpl 中的 StagingDocumentRepository bean。

你应该确保你定义了一个StagingDocumentRepository bean。为此，您可以使用多种方式。

使用像 Arno_Geismar 在他的回答中显示的 xml 配置
使用组件扫描功能并使用扫描的注释（例如@Repository）注释StagingDocumentRepository。
使用 Java config 定义 bean（如下所示）

Java 配置：

@Bean
public StagingDocumentRepository stagingDocumentRepository() {
  return new StagingDocumentRepository(..);
}

【讨论】：

【解决方案3】：

尝试在你的 spring config.xml 文件中定义它

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd">

<bean class="path.to.your.stagingdocumentrepository" id="StagingDocumentRepository" />

</beans>

没有xml的等价物是这样的：

@Configuration
public class ThisIsAnAppConfigClass{

   @Bean 
   public StagingDocumentRepository stagingDocumentRepository(){
      return new StagingDocumentRepository();
   }
}

【讨论】：

@Arno_Gesmar 我已根据您的建议编辑了我的配置。但仍然遇到同样的异常。
使用 @Repository 注释您的 StagingDocumentRepository
@Arno_Gesmar 很抱歉每次都给您带来麻烦。我也添加了存储库，但结果仍然相同
@Arno_Gesmar 在我得到更改后无法在 ThisIsAnAppConfigClass 类中实例化 StagingDocumentRepository 类型。我想我必须重写 mongo 存储库方法
你应该有一个实现接口的具体类。然后你的方法： public StagingDocumentRepository stagingDocumentRepository(){ return new StagingDocumentRepositoryImpl(); } 应该返回实现

【解决方案4】：

你的问题是它返回一个空值。

@Bean
@Qualifier("stagingDocumentRepository")
public StagingDocumentRepository stagingDocumentRepository() {
  return new StagingDocumentRepository(..);
}

【讨论】：

【解决方案5】：

尝试使用@repository 或@EnableMongoRepositories

【讨论】：

【解决方案6】：

您需要了解，在使用 Spring Data 时，指定的存储库的实现由 Spring Data 提供。您应该不提供任何此类实现。

如果您正确配置了 Spring Data，则 StagingDocumentRepository 的实现将由 Spring Data 提供。

Spring 报告不存在 StagingDocumentRepository 类型的 bean，这意味着您没有正确设置 Spring Data Mongo。

您的 Java 配置如下所示：

@Configuration
@EnableMongoRepositories("package.under.which.repositories.reside")
public class YourConfig {

    //whatever beans you need
}

您的存储库确实不需要需要包含任何额外的注释以供 Spring Data 获取。它只是：

public interface StagingDocumentRepository extends
  MongoRepository<CIPPayload, Serializable> {

}

【讨论】：