Deploy multiple springboot modules under tomcat at the same time, only one module generates logback log files

Specific scene:

　　Multiple projects are deployed under the same tomcat. Since the jars between each project are roughly the same, in order to reduce space consumption and facilitate the management of jars, I adopt a unified management method of jars, and put common jars in the tomcat container layer for loading ( load) to achieve unified management of jars.

question:

　　Multiple projects start normally under tomcat, but only the first project generates logback log files.

Solution:

　　Put the logback-core, logback-classic, and slf4j-api jars back into each project.