Remove org.apache.logging.log4j dependencies

[arichiardi]

From my (limited) experience 😄 with Java log, it looks like the org.apache.logging.log4j dependencies are only necessary at runtime.

It makes sense, the logger is a Java service and it is resolved at runtime, version and all. For instance in my project I have:

                [org.apache.logging.log4j/log4j-api "2.6.2" :scope "runtime"]
                [org.apache.logging.log4j/log4j-core "2.6.2" :scope "runtime"]
                [org.apache.logging.log4j/log4j-jcl "2.6.2" :scope "runtime"]
                [org.apache.logging.log4j/log4j-jul "2.6.2" :scope "runtime"]
                [org.apache.logging.log4j/log4j-1.2-api "2.6.2" :scope "runtime"]
                [org.apache.logging.log4j/log4j-slf4j-impl "2.6.2" :scope "runtime"]  

See the :scope? Everything is working fine. For this reason I would suggest to patch project.clj, remove the deps and let the app using your lib decide the implementation to hook.