build.sbt파일에 아래의 구문을 넣는다(sbt-assembly를 사용하는 경우만 가능함)

assemblyExcludedJars in assembly := { 
  val cp = (fullClasspath in assembly).value
  cp filter {_.data.getName == "slf4j-api-1.7.20.jar"}
}

*참고 : https://github.com/sbt/sbt-assembly#merge-strategy

-------------------------오류내용 -------------------------

C:devworkspacesda-commonbuildlibssda-common-2.0.0-SNAPSHOT.jar:org/slf4j/helpers/SubstituteLoggerFactory.class

C:Usersgooper.ivy2cacheorg.slf4jslf4j-apijarsslf4j-api-1.7.20.jar:org/slf4j/helpers/SubstituteLoggerFactory.class

        at sbtassembly.Assembly$.applyStrategies(Assembly.scala:140)

        at sbtassembly.Assembly$.x$1$lzycompute$1(Assembly.scala:25)

        at sbtassembly.Assembly$.x$1$1(Assembly.scala:23)

        at sbtassembly.Assembly$.stratMapping$lzycompute$1(Assembly.scala:23)

        at sbtassembly.Assembly$.stratMapping$1(Assembly.scala:23)

        at sbtassembly.Assembly$.inputs$lzycompute$1(Assembly.scala:67)

        at sbtassembly.Assembly$.inputs$1(Assembly.scala:57)

        at sbtassembly.Assembly$.apply(Assembly.scala:83)

        at sbtassembly.Assembly$$anonfun$assemblyTask$1.apply(Assembly.scala:240)

        at sbtassembly.Assembly$$anonfun$assemblyTask$1.apply(Assembly.scala:237)

        at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)

        at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)

        at sbt.std.Transform$$anon$4.work(System.scala:63)

        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)

        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)

        at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)

        at sbt.Execute.work(Execute.scala:237)

        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)

        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)

        at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)

        at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)

        at java.util.concurrent.FutureTask.run(FutureTask.java:266)

        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

        at java.util.concurrent.FutureTask.run(FutureTask.java:266)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

        at java.lang.Thread.run(Thread.java:745)

[error] (*:assembly) deduplicate: different file contents found in the following:

[error] C:devworkspacesda-commonbuildlibssda-common-2.0.0-SNAPSHOT.jar:org/slf4j/LoggerFactory.class

[error] C:Usersgooper.ivy2cacheorg.slf4jslf4j-apijarsslf4j-api-1.7.20.jar:org/slf4j/LoggerFactory.class

[error] deduplicate: different file contents found in the following:

[error] C:devworkspacesda-commonbuildlibssda-common-2.0.0-SNAPSHOT.jar:org/slf4j/helpers/BasicMDCAdapter.class

[error] C:Usersgooper.ivy2cacheorg.slf4jslf4j-apijarsslf4j-api-1.7.20.jar:org/slf4j/helpers/BasicMDCAdapter.class

[error] deduplicate: different file contents found in the following:

[error] C:devworkspacesda-commonbuildlibssda-common-2.0.0-SNAPSHOT.jar:org/slf4j/helpers/BasicMarker.class

[error] C:Usersgooper.ivy2cacheorg.slf4jslf4j-apijarsslf4j-api-1.7.20.jar:org/slf4j/helpers/BasicMarker.class

[error] deduplicate: different file contents found in the following:

[error] C:devworkspacesda-commonbuildlibssda-common-2.0.0-SNAPSHOT.jar:org/slf4j/helpers/SubstituteLogger.class

[error] C:Usersgooper.ivy2cacheorg.slf4jslf4j-apijarsslf4j-api-1.7.20.jar:org/slf4j/helpers/SubstituteLogger.class

[error] deduplicate: different file contents found in the following:

[error] C:devworkspacesda-commonbuildlibssda-common-2.0.0-SNAPSHOT.jar:org/slf4j/helpers/SubstituteLoggerFactory.class

[error] C:Usersgooper.ivy2cacheorg.slf4jslf4j-apijarsslf4j-api-1.7.20.jar:org/slf4j/helpers/SubstituteLoggerFactory.class

[error] Total time: 34 s, completed 2016. 8. 11 오후 1:51:31