Log4j configuration is correct, but logs cannot be printed on the console

I recently worked on a project and encountered a problem. I am dizzy! Log4j configuration is correct, but logs cannot be printed on the console! It was initially considered a configuration problem because the project was managed using Maven, and the package issue was not taken into account! I haven't found the reason for this for a long time! It's always the next step in debug mode to find the wrong location! It is a pain. The key is to deploy it on a test machine. You cannot do this! A bug has been found for you, and you do not know where to locate it! Oh, my God! Yes, but do you want to tell me where the error is ?! After a lot of unremitting efforts!

Slf4j-log4j12.jar package missing! Search online! It turns out to be really rare! I don't know how the architect can get rid of it? Let us call this development a pain! Share it!