1.Error setting driver on UnpooledDataSource
具体：Exception
in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error updating database.
Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause:
java.lang.ClassNotFoundException: Cannot find class:
com.mysql.jdbc.Driver
原因：该问题出现的原因是jdbc.properties文件里driver后面有空格，所以注意properties里的空格