Included jars seem to conflict with Confluence's

[max-allan-surevine]

These jars seem to cause problems, because Confluence already has newer versions of them :
jcl-over-slf4j-1.7.5.jar jul-to-slf4j-1.7.5.jar slf4j-api-1.7.5.jar log4j-over-slf4j-1.7.5.jar
I have no idea of the impact on removing them!