Question

我有使用存储库的Web应用程序

public interface UserRepository extends JpaRepository<User, Long> {
    User findByUsername(String username);
}

我的应用程序配置是：

@SpringBootApplication
@EntityScan("ru.dev.avtonomki.model")
@ComponentScan("ru.dev.avtonomki")
@EnableAutoConfiguration
public class Application {
   public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
   }
}

当运行sprint-boot时我遇到了问题：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Could not resolve matching constructor (hint: specify index/type/name arguments for simple parameters to avoid type ambiguities)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:240)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1193)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1095)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getSingletonFactoryBeanForTypeCheck(AbstractAutowireCapableBeanFactory.java:923)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryBean(AbstractAutowireCapableBeanFactory.java:804)
at org.springframework.beans.factory.support.AbstractBeanFactory.isTypeMatch(AbstractBeanFactory.java:558)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:432)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:395)
at org.springframework.beans.factory.BeanFactoryUtils.beanNamesForTypeIncludingAncestors(BeanFactoryUtils.java:220)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1267)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101)

Answer 1

您必须使用@Repository注释您的存储库，如此

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    User findByUsername(String username);
}

从Spring 2.5开始，这个注释也作为@Component的特化，允许通过类路径扫描自动检测实现类。

如何修复BeanCreationException问题？

1 个答案: