log4j警告信息如下：

log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

解决方法：

直接用第二种方法就行

https://blog.csdn.net/qq_34474324/article/details/98874675

log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).