Log4d:Error:Could not instantiate class[com.mapgis.util.tools.JDBCExtAppender]

https://blog.csdn.net/gikieng/article/details/47150567  https://blog.alswl.com/2018/03/sql-server-migration-1/  https://www.xuebuyuan.com/zh-hant/1922708.html

log4j:Error could not instantiate appender named "DB"

https://bbs.csdn.net/topics/390465887?page=1

找不到类？？？

监控：https://www.cnblogs.com/2008nmj/p/10986148.html

https://forums.developer.amazon.com/questions/176510/could-not-instantiate-class-lambdaappender-on-ask.html