Question

我的组件定义如下

@Component("myBo")
public class MyBO {

    @Autowired
    JpaRepository<MyData, Long> repository;

Spring数据接口：

public interface MyDataRepository extends JpaRepository<MyData, Long> {

Entitymanager定义：

    @Bean(name = "entityManagerFactory")
public LocalContainerEntityManagerFactoryBean entityManagerFactory( EntityManagerFactoryBuilder builder, @Qualifier("dmDs") final DataSource dmDs) {

    LocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBean = builder.dataSource(dmDs).packages(new String[]{"my.packages"}).build();
    return localContainerEntityManagerFactoryBean;

}

我的测试因此错误而失败

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myBO': Unsatisfied dependency expressed through field 'repository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.data.jpa.repository.JpaRepository<MyData, java.lang.Long>' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}    
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588)    

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.data.jpa.repository.JpaRepository<MyData, java.lang.Long>' available: expected at least 1 bean which qualifies as autowire candidate.

而以下工作正常。需要帮助来理解这种行为。

@Component
public class MyBO {

@Autowired
JpaRepository<MyData, Long> repository;

谢谢

Answer 1

您不应该按原样自动装配JpaRepository<MyData, Long>。您应该扩展它并创建自己的界面，如下所示。

public interface MyRepository extends JpaRepository<MyData, Long> {
}

您无法直接自动装配JpaRepository的原因是因为它使用NoRepositoryBean注释进行了注释，并且无法创建它的实例。始终建议扩展基本repo类并创建自己的接口。

P.S：不要忘记在要创建的这些repo接口上启用Jpa存储库。否则你将无法自动装配它们。

与xml配置中的相似。

<jpa:repositories base-package="com.acme.repositories"/>

使用定义的值连接@Component时的Spring NoSuchBeanDefinitionException

1 个答案: