No qualifying bean of type 'com.atguigu.pojo.Calc' available: expected at least 1 bean which qualifies as autowire candidate
时间: 2023-08-25 09:13:32 浏览: 44
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相关问题
No qualifying bean of type 'com.sj.service.BookService' available: expected at least 1 bean which qualifies as autowire candidate.
"No qualifying bean of type 'com.sj.service.BookService' available: expected at least 1 bean which qualifies as autowire candidate." 这个错误通常是由于Spring容器在注入时找不到符合自动装配要求的bean引起的。这可能是由于以下原因导致的:
1. 没有正确配置bean:请确保你在Spring配置文件中正确地配置了'com.sj.service.BookService'类的bean。你可以使用@Component或@Service等注解来标记该类,并确保配置了@ComponentScan以扫描该类所在的包。
2. 依赖注入类型不匹配:确保你的依赖注入注解(@Autowired)匹配了正确的类型。检查你的注入注解是否在'com.sj.service.BookService'类的属性上,并且确保注入的类型是正确的。
3. 编译错误或类路径问题:如果以上步骤都正确,那么可能是由于编译错误或类路径问题导致的。检查你的项目是否已正确编译,并确保'com.sj.service.BookService'类位于正确的类路径下。
总结来说,如果你遇到了"No qualifying bean of type 'com.sj.service.BookService' available: expected at least 1 bean which qualifies as autowire candidate."的错误,你应该检查你的配置文件、依赖注入类型和类路径是否正确。如果还是无法解决问题,你可以检查是否存在编译错误或其他相关问题。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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No qualifying bean of type 'com.xxx' available: expected at least 1 bean which qualifies as autowire
报错信息"No qualifying bean of type 'com.xxx' available: expected at least 1 bean which qualifies as autowire candidate"表示没有符合自动装配条件的类型为'com.xxx'的bean可用。
根据报错信息中提到的入口方法"org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1356)",我们可以看到问题出现在AServiceImpl的构造函数中,其中的最后一个入参是String类型。
解决该问题的方式有三种:
1. 使用@Autowired注解对属性或者方法进行Bean的注入。然而,从Spring 4.0开始,不再推荐使用属性注入模式,因为它会隐藏一些可能导致代码出错的隐患。
2. 使用@RequiredArgsConstructor(onConstructor =@_(@Autowired))注解,这样默认会通过@Autowired注入Bean。
3. 使用@RequiredArgsConstructor(onConstructor_={@Lazy})注解,对Bean进行懒加载处理。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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