解决异常Error creating bean with name ‘xxxxxController‘: Unsatisfied dependency expressed through field

今天来聊一下常见的异常，异常信息如下图所示：

错误信息如下：

Error creating bean with name 'helloController': Unsatisfied dependency expressed through field 'userService'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean 'com.cloud.xp.manager.service.UserService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

大家可以看到黑体部分的信息，意思是创建helloController这个bean出错了，嵌套异常是userService不满足依赖，容器里面没有com.cloud.xp.manager.service.UserService 的实例，

好了，也就是说我们的userService对象不存在,导致注入的时候失败了，然后抛出了Error creating bean with name 'helloController这个异常，好了，既然是userService这个对象的问题，那么我们就首先来分析，userService对象是怎么添加到容器里的，首先我想到的就是注解，这个时候我们可以先检查一下UserService这个接口的实现类上又没加上Service注解，

看，为了制造这个异常，我把这个注解注释掉了，好了，打开这个注解就可以了。可能大家都知道这个注解的作用，但是总会经常忘掉，看到一大堆异常，又暂时找不到哪里有问题，所以这里小编提醒各位，编码一定要细心点哈。

至于其他的问题，就要仔细检查自己的配置文件里和service相关的配置是不是写错了。

对了，表现层的注解也不要忘了，不然会导致同样的悲剧哈

如果有类似的问题欢迎一起交流讨论

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