Spring Boot中JPA存储库“没有合格类型bean”

Question

我正在用Spring Boot实现Rest API。由于我的实体类来自另一个包的包，所以我必须使用注释entityscan来指定。此外，我使用enableJparepositories指定定义JPA存储库的包。下面是我的项目的样子：

//Application.java

@Configuration
@EnableAutoConfiguration
@ComponentScan
@EntityScan("org.mdacc.rists.cghub.model")
@EnableJpaRepositories("org.mdacc.rists.cghub.ws.repository") 

在我的controller类中，我有一个SeqService对象自动连线。

//SeqController.java

@Autowired private SeqService seqService;

@RequestMapping(value = "/api/seqs", method = GET, produces = APPLICATION_JSON_VALUE)
public ResponseEntity<List<SeqTb>> getSeqs() {
    List<SeqTb> seqs = seqService.findAll();
    return new ResponseEntity<List<SeqTb>>(seqs, HttpStatus.OK);
}

seqservice是一个接口，我通过它为seqserviceBean创建了一个Bean类。在seqServiceBean中，我自动连接了JPA存储库：

// SeqServiceBean.java

@Autowired private SeqRepository seqRepository;

@Override
public List<SeqTb> findAll() {
    List<SeqTb> seqs = seqRepository.findAll();
    return seqs;
}

//SeqRepository.java

@Repository
public interface SeqRepository extends JpaRepository<SeqTb, Integer> {

    @Override
    public List<SeqTb> findAll();

    public SeqTb findByAnalysisId(String analysisId);
}

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.mda.rists.cghub.ws.repository.SeqRepository] 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:1373) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1119) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]

我不明白这个错误。跟排位bean有什么关系？

Answer 1

您扫描了enablejparepositories中的错误包。没有org.mdacc.rists.cghub.ws.repository包。因此，请改用以下内容：

@EnableJpaRepositories("org.mda.rists.cghub.ws.repository") 

Spring Boot不需要任何特定的代码布局来工作，然而，有一些最佳实践会对您有所帮助。查看spring boot文档中关于构造代码的最佳实践。