通用mapper打jar包报错Failed to obtain JDBC Connection；nested exception is com.mysql.jdbc.exceptions.jdbc4._failed to obtain jdbc connection; nested exception

作者：我家小花儿 | 2024-08-13 21:58:45

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failed to obtain jdbc connection; nested exception is com.mysql.cj.jdbc.exce

最近自己搭建springboot的demo案例，正准备将案例打成jar包的时候提示报错

org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server

根据错误提示和自己尝试解决方式如下：

因引入通用mapper，在pom.xml中就不再引用jdbc和mybatis的依赖包，但是自己打jar包的时候mysql的数据库连接服务未启动，所以连接jdbc失败，所以重新开启mysql连接即可解决

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