SpringBoot CRUD 存储库无法自动装配 [英] SpringBoot CRUD Repository fail to Autowire

问题描述

我正在使用 SpringBoot 和 JPA.我收到一个无法完成的 @Autowired 错误.

I'm working with SpringBoot and JPA. I'm getting an error with an @Autowired that could not be completed.

这是我的主要课程:

package com;

@SpringBootApplication
@EnableJpaRepositories(basePackages="com.repository")
public class InitBatch implements CommandLineRunner {

    @Autowired
    private Batch batch;

    @Autowired
    private CareDao careDAO;


    @Override
    public void run(String... args) throws Exception {
        careDAO.setMessageSource(messageSource());      
        batch.processFiles();   
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(InitBatch.class, args).close();
        System.out.println("Finish");
    }


    @Bean
    public ReloadableResourceBundleMessageSource messageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();

        messageSource.setBasename("file:/config/instances");
        messageSource.setCacheSeconds(100);
        return messageSource;
    }   
}

这是我失败的课程:

package com.logger.impl;

@Configuration
@ComponentScan({"com.repository"})

@Component
public class RequestLoggerImpl implements RequestLogger {

    @Autowired
    private RequestLogDao requestLogDao;

}

这是 RequestLogDao 类:

package com.repository;
public interface RequestLogDao extends CrudRepository<RequestLog, Integer> {

}

这是错误信息:

创建名为requestLoggerImpl"的 bean 时出错:注入自动装配的依赖项失败；

Error creating bean with name 'requestLoggerImpl': Injection of autowired dependencies failed;

无法自动装配字段:private com.repository.RequestLogDao com.logger.impl.RequestLoggerImpl.requestLogDao;嵌套异常是 org.springframework.beans.factory.NoSuchBeanDefinitionException:未找到类型为 [com.repository.RequestLogDao] 的合格 bean 依赖项:预计至少有 1 个 bean 有资格作为此依赖项的自动装配候选者.依赖注解:{@org.springframework.beans.factory.annotation.Autowired(required=true)}

Could not autowire field: private com.repository.RequestLogDao com.logger.impl.RequestLoggerImpl.requestLogDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.repository.RequestLogDao] 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)}

我就是不知道为什么它不能自动装配.我曾尝试在我的主类中添加 @EnableJpaRepositories ，但这不起作用.有什么建议吗?提前致谢！

I just can't find out why it can't autowire. I have tried adding @EnableJpaRepositories in my main class, but this did not work. Any suggestions? Thanks in advance!

推荐答案

对于你的请求记录器，首先移除配置和组件扫描

For your request logger, remove the configuration and component scan first

package com.logger.impl;

@Component
public class RequestLoggerImpl implements RequestLogger {

    @Autowired
    private RequestLogDao requestLogDao;

}

既然你已经放置了一个@Configuration，我假设你需要一个配置类，这样你就可以像这样创建一个:

Since you've placed a @Configuration, i assume you will need a config class so you can create one like this:

@Configuration
@EnableJpaRepositories(basePackages = {"com.repository"}
public class MyConfiguration {
    // possibly your Bean declarations here
    // like dataSource, transactionManager etc.. related to your jpa repo
    // as needed
}

在此处记下您的基础包；因为它将用于:

Take note of your base package here; as it will be used for:

package com.repository;

@Repository
public interface RequestLogDao extends CrudRepository<RequestLog, Integer> {
    // ...
}

终于在你的主课上

@SpringBootApplication // scan base packages for autowiring as needed
public class InitBatch implements CommandLineRunner {
    // ...
}

最后检查您的依赖项.

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