"考虑在配置中定义“com.example.conferencedemo.services.SessionService”类型的 bean"
[英]Consider defining a bean of type 'com.example.conferencedemo.services.SessionService' in your configuration
问题描述
I am trying to implement as of enterprise level, there they have folders like Repository<\/strong> , Service<\/strong> , ServiceImpl<\/strong>
我正在尝试实现企业级，它们有像Repository<\/strong> ， Service<\/strong> ， ServiceImpl<\/strong>这样的文件夹
- In Services they have interface with method declaration在服务中，它们具有与方法声明的接口<\/li>
- In ServiceImpl they have class implementing the interface of services在 ServiceImpl 他们有实现服务接口的类<\/li>
- In Repository they have all Repository interfaces在存储库中，它们具有所有存储库接口<\/li>
- BeanInjection is a class where we have all repositories and service classes and interfaces with @Autowired<\/strong> annotation. BeanInjection 是一个类，我们在其中拥有所有存储库和服务类以及带有@Autowired<\/strong>注释的接口。<\/li>
- When I tried to implement "@Autowired" to service class getting this Error.当我尝试对服务类实施“@Autowired”时出现此错误。<\/li>
- Tried this no help link<\/a>试过这个没有帮助的链接<\/a><\/li>
- Tried this no help but getting loop error link<\/a>试过这个没有帮助，但得到循环错误链接<\/a><\/li><\/ol>Controller.java<\/strong>控制器.java<\/strong>
public class SessionController extends BeanInjectionService { @GetMapping public ResponseEntity<List<Session>> list(){ LOGGER.info("Request received to view the sessions"); List<Session> sessions = sessionService.findAll(); LOGGER.info("Successfully fetched all the sessions"); return new ResponseEntity<>(sessions, HttpStatus.OK); }<\/code><\/pre>SessionService.java(Interface)<\/strong> SessionService.java（接口）<\/strong>
public interface SessionService { List<Session> findAll(); }<\/code><\/pre>SessionServiceImpl.java(Class)<\/strong> SessionServiceImpl.java(类)<\/strong>
public class SessionServiceImpl extends BeanInjectionService implements SessionService { @Override public List<Session> findAll(){ return sessionRepository.findAll(); }<\/code><\/pre>BeanInjectionService.java(Class)<\/strong> BeanInjectionService.java(类)<\/strong>
public class BeanInjectionService { @Autowired public SessionRepository sessionRepository; **\/\/ Error Showing here while starting application \/\/ Consider defining a bean of type 'com.example.conferencedemo.services.SessionService' in your configuration.** @Autowired public SessionService sessionService; @Autowired public SpeakerRepository speakerRepository; @Autowired public SpeakerService speakerService; }<\/code><\/pre>SessionRepository.java(Interface)<\/strong> SessionRepository.java（接口）<\/strong>
public interface SessionRepository extends JpaRepository<Session,Long> { }<\/code><\/pre>Thanks in advance<\/strong>提前致谢<\/strong>
"
1 个解决方案
解决方案1
0 已采纳 2022-02-07 08:40:27
I find using BeanInjectionService<\/code> a little weird, but I'll answer around it.我发现使用BeanInjectionService<\/code> ，但我会回答它。
Unless you add@Service<\/code> onSessionServiceImpl<\/code> , you can't autowire it.除非您在SessionServiceImpl<\/code>上添加@Service<\/code> ，否则您无法自动装配它。<\/li>Circular dependency<\/strong> - If you do step 1, it will create a circular dependency becauseSessionServiceImpl<\/code> needs its superclass object(BeanInjectionService<\/code> ) to be created first.循环依赖<\/strong>- 如果您执行第 1 步，它将创建循环依赖，因为SessionServiceImpl<\/code>需要首先创建其超类对象（BeanInjectionService<\/code> ）。ButBeanInjectionService<\/code> cannot be created unless it finds an object ofSessionServiceImpl<\/code> .但是除非找到SessionServiceImpl<\/code>的对象，否则无法创建BeanInjectionService<\/code> 。<\/li>To break the circular dependency, you have only one option.要打破循环依赖，您只有一种选择。 Don't extendBeanInjectionService<\/code> .不要扩展BeanInjectionService<\/code> 。Rather, autowireSessionRepository<\/code> directly intoSessionServiceImpl<\/code> .相反， SessionRepository<\/code>直接自动连接到SessionServiceImpl<\/code>中。<\/li><\/ol>@Service public class SessionServiceImpl implements SessionService { @Autowired private SessionRepository sessionRepository; @Override public List<Session> findAll(){ return sessionRepository.findAll(); } }<\/code><\/pre>"
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.