Could not get JDBC Connection

[yuezhao-zy]

Could not get JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!

The error may exist in com/system/mapper/UserloginMapper.xml

The error may involve com.system.mapper.UserloginMapper.selectByExample

The error occurred while executing a query

可以帮忙解释下这是为啥吗？

[zou-Jack]

报错是数据库的问题，检查项目里面写了数据库账户密码的配置文件，是不是跟你的数据库账号密码一样？

[yuezhao-zy]

谢谢，已经解决了。是jdbc-connector jar包的版本与我的mysql不一致，我更新了一下jar就可以连接了。谢谢啦！