Logstash 6 includes both 2.6.2 and 2.8.2 for slf4j


#1

When I start logstash 6.0.0-rc1 after upgrading from 5.6.2 it complains that there are two bindings in the path

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/share/logstash/logstash-core/lib/org/apache/logging/log4j/log4j-slf4j-impl/2.6.2/log4j-slf4j-impl-2.6.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-input-kafka-8.0.2/vendor/jar-dependencies/runtime-jars/log4j-slf4j-impl-2.8.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]

(system) #2

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