Spray microservice assembly deduplicate - scala

Question

I'm using this template to develop a microservice:
http://www.typesafe.com/activator/template/activator-service-container-tutorial
My sbt file is like this:
import sbt._
import Keys._
name := "activator-service-container-tutorial"
version := "1.0.1"
scalaVersion := "2.11.6"
crossScalaVersions := Seq("2.10.5", "2.11.6")
resolvers += "Scalaz Bintray Repo" at "https://dl.bintray.com/scalaz/releases"
libraryDependencies ++= {
val containerVersion = "1.0.1"
val configVersion = "1.2.1"
val akkaVersion = "2.3.9"
val liftVersion = "2.6.2"
val sprayVersion = "1.3.3"
Seq(
"com.github.vonnagy" %% "service-container" % containerVersion,
"com.github.vonnagy" %% "service-container-metrics-reporting" % containerVersion,
"com.typesafe" % "config" % configVersion,
"com.typesafe.akka" %% "akka-actor" % akkaVersion exclude ("org.scala-lang" , "scala-library"),
"com.typesafe.akka" %% "akka-slf4j" % akkaVersion exclude ("org.slf4j", "slf4j-api") exclude ("org.scala-lang" , "scala-library"),
"ch.qos.logback" % "logback-classic" % "1.1.3",
"io.spray" %% "spray-can" % sprayVersion,
"io.spray" %% "spray-routing" % sprayVersion,
"net.liftweb" %% "lift-json" % liftVersion,
"com.typesafe.akka" %% "akka-testkit" % akkaVersion % "test",
"io.spray" %% "spray-testkit" % sprayVersion % "test",
"junit" % "junit" % "4.12" % "test",
"org.scalaz.stream" %% "scalaz-stream" % "0.7a" % "test",
"org.specs2" %% "specs2-core" % "3.5" % "test",
"org.specs2" %% "specs2-mock" % "3.5" % "test",
"com.twitter" %% "finagle-http" % "6.25.0",
"com.twitter" %% "bijection-util" % "0.7.2"
)
}
scalacOptions ++= Seq(
"-unchecked",
"-deprecation",
"-Xlint",
"-Ywarn-dead-code",
"-language:_",
"-target:jvm-1.7",
"-encoding", "UTF-8"
)
crossPaths := false
parallelExecution in Test := false
assemblyJarName in assembly := "santo.jar"
mainClass in assembly := Some("Service")
The project compiles fine!
But when I run assembly, the terminal show me this:
[error] (*:assembly) deduplicate: different file contents found in the following:
[error] /path/.ivy2/cache/io.dropwizard.metrics/metrics-core/bundles/metrics-core-3.1.1.jar:com/codahale/metrics/ConsoleReporter$1.class
[error] /path/.ivy2/cache/com.codahale.metrics/metrics-core/bundles/metrics-core-3.0.1.jar:com/codahale/metrics/ConsoleReporter$1.class
What options do I have to fix it?
Thanks

Answer 1

The issue as it seems transitive dependency of the dependency is resulting with two different versions of metrics-core. The best thing to do would be to used the right library dependency so that you end up with a single version of this library. Please use https://github.com/jrudolph/sbt-dependency-graph , if it is difficult to figure out dependencies.
If it is not possible to get to a single version then you would most likely to go down exclude route . I assume, this only work, if there is compatibility between the all required versions.