我是CAS中OAuth客户端支持的创建者。实际上， Google2Provider 中存在一个错误：默认的 scope 为null。使用适当的设置器设置实际范围： setScope（最终Google2Scope范围）以解决问题...

I'm the creator of the OAuth client support in CAS. In fact, there was a bug in the Google2Provider : the default scope is null. Set a real scope using the appropriate setter : setScope(final Google2Scope scope) to fix the problem...