sbt exclusion slf4j not working

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I have a third party dependency in my play project. That third party library has eventual dependency ( not direct ) on an slf4j implementation.

I am getting duplicate binding error for slf4j. 

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:~/.ivy2/cache/ch.qos.logback/logback-classic/jars/logback-classic-1.1.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/~/.ivy2/cache/com.orgname.platform/platform-logging-client/jars/platform-logging-client-2.5.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]

I tried following things but can get rid of the error.

"com.orgname.platform" % "platform-metric-client" % "1.0.4" excludeAll(
    ExclusionRule(organization = "org.slf4j"))

I also tried following exclusion

"com.orgname.platform" % "platform-metric-client" % "1.0.4" exclude("org.slf4j","slf4j-jdk14)

and also this one

 "com.orgname.platform" % "platform-metric-client" % "1.0.4" exclude("org.slf4j","slf4j-log4j12)

Since I was not able to remove the slf4j from third party dependency I, tired to remove the play dependency on slf4j, by modifying projcts/plugin.sbt

addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.4.6" exclude("org.slf4j", "slf4j-simple"))

How should I go about getting rid of this warning. how does this warning impact the logging? Which logging implementation would be used the Scala implementation?

sbt playframework slf4j scala
4 Answers

Both answers provided by @YourBestBet and @goozez are correct if your goal is to exclude the dependency from the project.

In my project , I had multiple dependencies that included slf4j and they conflicted with each other.

An easy fix (but tedious depending on the number of dependencies you have) is to exclude it from the conflicting dependency manually instead of removing it entirely from the project as you might need it. 

  "org.elasticsearch" % "elasticsearch" % esVersion exclude("org.slf4j", "*"),
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