org.springframework.security.authentication.InternalAuthenticationServiceException: Index: 0, Size:

SpringSecurity使用MySQL数据库进行认证，MySQL中带中文的用户认证报此错误

org.springframework.security.authentication.InternalAuthenticationServiceException: Index: 0, Size: 0Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

MySQL的url未配置中文即转换

url: jdbc:mysql://localhost:3306/usertest?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8

在url后面添加 

&useUnicode=true&characterEncoding=utf-8

即可