No qualifying bean of type 'com.frankxulei.service.UserService' ava...

原文链接： https://yq.aliyun.com/articles/688175

Java Spring MVC 5 使用MyBatis连接池异常：
错误信息：
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.frankxulei.service.UserService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}

at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1501)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1099)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1060)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:809)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:715)
... 45 more

原因分析：
控制器里使用了Autowired依赖注入，但是没有找到 依赖'com.frankxulei.service.UserService' 。
这里是代码：
public class UsersController {

@Autowired
private UserService userService;

解决办法：
依赖上加入名称即可，或者修改XML也行。
@Service("userService")
public class UserService {