MySQL 换成 8.0后，Java JDBC jar包版本过低
需升级jar包----->mysql-connector-java-5.1.46.jar或者更高，根据mysql版本决定
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Unknown initial character set index '255' received from server. Initial client character set can be
【java报错】Unknown character set index for field '224' received from server.
Exception in thread "main" java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
docker自制jar包镜像运行容器报（The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.）
The last packet successfully received from the server was 8 milliseconds ago.
Communications link failure，The last packet successfully received from the server was *** millisecon
window下mysql character_set_server修改不生效问题
mysql如何更改character-set-server默认为latin1
解决问题 “You don't have permission to access /index.html on this server.”