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This is caused by API classes from org.slf4j which depend on implementation classes from org.slf4j.impl module.
Romain Pelisse <belaran> updated the status of jira JBEAP-3411 to Closed
As discussed on JBEAP-3411, this circular dependency is required. There is no plan to fix upstream (at least not quite soon) and thus no ground to backport it and fix it into 6.4.x. Therefore I'm closing this issue (but of course if you feel I'm wrong to do so, please reopen it).