Question

我遇到Spring和CrudRepository的问题，我的代码没有编译我有这个错误

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我的代码：

Application.java

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [person.repository.PersonRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1373) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1119) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:813) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
... 18 common frames omitted

PersonRepository.java

package person.application;
        @SpringBootApplication 
    public class Application {

        private static final Logger log = LoggerFactory.getLogger(Application.class);

        public static void main(String[] args) {
            SpringApplication.run(Application.class);
        }

        @Bean
        public CommandLineRunner demo(PersonRepository repository) {
            return (args) -> {
                // save a couple of customers
                repository.save(new Client(1,"keke","boy","kekeboy","ee","r","","","","",""));
             };
         }

    }

Person.java

package person.repository;

@Repository
public interface PersonRepository extends CrudRepository<Client, Long> {

    List<Client> findBylastname(String lastName);

}

configuration.xml文件

@Entity
public class Client {

}

你能帮我吗？

Answer 1

接口不需要@Repository。删除它并添加以下

<repositories base-package="person.repository" />

看看这里

Repositories >>

Answer 2

Spring boot建议您将主应用程序类放在其他类之上的根包中。 @EnableAutoConfiguration注释通常放在您的主类上，并隐式为某些项定义基础search package。例如，如果您正在编写JPA应用程序，则@EnableAutoConfiguration带注释的类的包将用于搜索@Entity或@Repository项。因此，我建议您将项目结构更改为以下内容：

com
 +- example
     +- myproject
         +- Application.java (annotated with @SpringBootApplication)
         |
         +- model
         |   +- Client.java
         |
         +- repository
         |   +- ClientRepository.java
         |   +- PersonRepository.java
         |
         +- service
         |   +- ClientService.java
         |

使用此结构，您不需要configuration.xml，因此您可以安全地删除它。在spring boot documentation中阅读有关此主题的更多信息。另外，请确保您的类路径中有spring-boot-starter-data-jpa。

Answer 3

你的PersonRepository实现在哪里？如果你有，你应该添加注释让接口知道它是注入的。

错误是“预计至少有一个bean”意味着他们找不到它〜

Answer 4

在class Comment(EmbeddedDocument): created = DateTimeField() text = StringField() class Post(Document): comments = EmbeddedDocumentListField(Comment) ... def add_or_replace_comment(self, comment): existing = self.comments.filter(created=comment.created) if existing.count() == 0: self.comments.create(comment) else: existing.update(comment)课程中添加@EnableJpaRepositories(basePackages = {"person.repository"})注释。此批注用于启用JPA存储库。默认情况下，它将扫描Spring Data存储库的带注释配置类的包。您也可以使用Application.java
指定
无需在@EnableJpaRepositories(basePackageClasses=PersonRepository.class)课程中指定@Repository。＃{1}}＃1中的注释会将其标识为PersonRepository。
只需删除@EnableJpaRepositories文件即可。这不是必需的。

Spring：创建bean时出错

4 个答案: