oauth2 出现 cannot be cast to .security.oauth2.provider.authentication.OAuth2AuthenticationDetails

一、问题背景

在使用oauth2获取用户登录信息的时候,如果用户未登录,就会出现 org.springframework.security.web.authentication.WebAuthenticationDetails cannot be cast to org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetails;

问题如下:
二、原因
问题出现在以下两句代码：
Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
OAuth2AuthenticationDetails details = (OAuth2AuthenticationDetails)

oauth2 出现 cannot be cast to .security.oauth2.provider.authentication.OAuth2AuthenticationDetails最先出现在Python成神之路。