解决报错
This application has no explicit mapping for /error, so you are seeing this as a fallback. Tue Jan 07 21:06:43 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. Attempted reconnect 3 times. Giving up. ### The error may exist in com/imooc/mapper/StuMapper.java (best guess) ### The error may involve com.imooc.mapper.StuMapper.selectByPrimaryKey ### 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. Attempted reconnect 3 times. Giving up.
检查数据库名 密码 端口无误后
修改包的版本
将
<version>5.1.41</version>
改为
<version>5.1.47</version>
重新运行项目 报错解决 可以调接口
{"id":1001,"name":"test","age":20}
原文：https://www.cnblogs.com/guangzhou11/p/12163768.html