一、因为@Autowired写成了@overide

[java]No qualifying bean of type 解决方法 - vickylinj - 博客园 (cnblogs.com)

二、是因为注入的ServiceIml类上没有加@Service注解

三、没有扫描包

(5条消息) NoSuchBeanDefinitionException：No qualifying bean of type 解决方法_杜仁栋的专栏-CSDN博客

(5条消息) 关于SpringBoot bean无法注入的问题（与文件包位置有关）改变自动扫描的包_爱笑的博客-CSDN博客

四、java程序编写时，当bean文件中有多个类而使用@Autowired时未进行指定就会出现这个错误

(5条消息) no qualifying bean of type bean的解决方法_牧濑_红莉栖的博客-CSDN博客

五、因为Redis报错导致这个错误

(5条消息) Springboot RedisTemplate 报No qualifying bean of type... 不能按类型装配注入_wangyuanjun008的博客-CSDN博客

最全面经及答案(已700+收藏量)：

(5条消息) 2021年5月最新面经答案总结(Java基础、数据库、JVM、计网、计操、集合、多线程、Spring)_万小猿的博客-CSDN博客

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