"Use of the SLF4J adapter (log4j-to-slf4j-2.0.jar) together with the SLF4J bridge (log4j-slf4j-impl-2.0.jar) should never be attempted as it will cause events to endlessly be routed between SLF4J and Log4j 2."
Log4j Provider Using SLF4J – Log4j to SLF4J Adapter - Apache Log4j to SLF4J Adapter https://logging.apache.org/log4j/2.3.x/log4j-to-slf4j/