SpringSecurity启动时报错"Field userDetailsService in…"

错误详细信息：Field userDetailsService in com.rqz.security.config.WebSecurityConfig required a bean of type ‘org.springframework.security.core.userdetails.UserDetailsService’ that could not be found.

原因：因为导包导入的是**org.springframework.security.core.userdetails.UserDetailsService;**这个包，导致我自定义的UserDetailsService接口找不到

解决方法：

在自定义的UserDetailsService内继承org.springframework.security.core.userdetails.UserDetailsService这个接口

public interface UserDetailsService extends org.springframework.security.core.userdetails.UserDetailsService {}