Caused by: org.mybatis.spring.MyBatisSystemException:
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: No timezone mapping entry for ‘shanghai’
异常分析与解决办法：这里的问题很明显是设置timezone=‘shanghai’ 出现了问题！！只要改成timezone=‘Asia/Shanghai’或者timezone='GMT%2B8’即可。