如果配置了數據源不能連接，報這個

{

? ? "timestamp": "2018-12-05T02:54:43.951+0000",

? ? "status": 500,

? ? "error": "Internal Server Error",

? ? "message": "nested exception is org.apache.ibatis.exceptions.PersistenceException: \r\n### 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.\r\n### The error may exist in com/imooc/mapper/UsersMapper.java (best guess)\r\n### The error may involve com.imooc.mapper.UsersMapper.selectOne\r\n### The error occurred while executing a query\r\n### 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.",

}

就去檢查數據源配置信息

導入org.mybatis.spring.annotation.MapperScan服務器報和你一樣的錯，換成tk.mybatis.spring.annotation.MapperScan，服務器響應超級慢，然后最后報個500

在項目中搜索BaseInsertProvider 這個類，發現只有

tk.mybatis.spring.annotation.MapperScan

這個包中有，改為導入該類。

把SpringBoot的Application啟動類的@MapperScan注解導入包換成import org.mybatis.spring.annotation.MapperScan;試一下