Spring Boot中JPA存储库“没有符合条件的bean类型”

Question

我正在用Spring Boot实现Rest API。因为我的实体类来自另一个包，所以我必须用注释EntityScan来指定它。另外，我使用EnableJParepositories来指定定义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Autowired。

//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，我从它为seqServiceBean创建了一个Bean类。在SeqServiceBean中，我对JPA存储库进行了描述：

// 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。和排位赛bean有什么关系？

Answer 1

您在enableJParepositories中扫描了错误的包。没有org.mdacc.rists.chub.ws.repository包。所以，改用这个：

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

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