log4j

Java常用日志框架介绍（转）

https://www.cnblogs.com/junzi2099/p/7553376.html

Log4j、Log4j 2、Logback、SFL4J、JUL、JCL的比较

https://www.cnblogs.com/junzi2099/p/7930268.html

slf4j boud to log4j
Component
|
| log to Apache Commons Logging
V
jcl-over-slf4j.jar--(redirect)-->slf4j-api---->slf4j-log4j12---->log4j