Mysql与JDBC版本兼容性问题

一、报错信息

mybaits查询报错：

Tue Oct 20 15:46:34 CST 2020
There was an unexpected error (type=Internal Server Error, status=500).nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: 
Failed to obtain JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
### The error may exist in file [D:projectmybatis	argetclassesmapperTruckInfoMapper.xml] 
### The error may involve com.example.mybatis.cache.dao.mapper.TruckInfoMapper.getTruckInfo 
### The error occurred while executing a query 
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: 
Failed to obtain JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.

二、问题排查

　　从报错信息上预测是JDBC连接获取失败导致。因此，首先查询mysql版本和jdbc版本。

1、查询mysql版本

 Mysql版本为8.0.19。

2、查询JDBC版本

 JDBC版本为5.1.39。

3、问题结论

　　Mysql与JDBC版本不一致，兼容性问题导致JDBC连接获取失败。

三、解决方案

1、升级JDBC版本，5.1.39--->8.0.12。
2、修改数据库驱动，  driver-class-name: com.mysql.cj.jdbc.Driver