一开始用的MySQL8.0版本
解决办法：
将mysql改为5.1.6
- SQLException connection localhost 错误 createsqlexception connection localhost错误 connection localhost错误failed 39 sqlexception localhost password hikaridatasource sqlexception connection hikaripool sqlexception connection exception interrupt mysql localhost 39 connect jdbctemplate sqlexception connection errorcode quot sqlexception connection errorcode connection the localhost actions localhost connect server mysql