java项目连mysql时报错Unknown character set index for field '255' received from

Question

java项目连mysql时报错：java.sql.SQLException: Unknown character set index for field '255' received from server.mysql版本8.0.12，jar包mysql-connector-java-8.0.12.jarmysql编码都是utf8:
建立连接的url也指定了utf8:
url = "jdbc:mysql://localhost:3306/xxx?useUnicode=true&characterEncoding=utf8";请问是什么原因啊

Answer 1

https://blog.csdn.net/qq_38674645/article/details/81105266
版本问题

Answer 2

但是我的jar包是官网最新的了啊

Answer 3

但是我的jar包是官网最新的了啊