Cross compile to 2.12

.travis.yml

@@ -8,6 +8,6 @@ before_script:
   - tar -xvf protobuf-2.6.1.tar.gz
   - cd protobuf-2.6.1 && ./configure && make && sudo make install && sudo ldconfig && cd ..
 script:
-  - sbt clean buffered-config-test:test invalid-config-test:test coverage test coverageReport && sbt coverageAggregate
+  - sbt clean +buffered-config-test:test +invalid-config-test:test coverage +test +coverageReport && sbt coverageAggregate
 after_success:
   - sbt coveralls

build.sbt

@@ -4,14 +4,15 @@ import sbtprotobuf.ProtobufPlugin
 val akkaVersion = "2.4.16"
 val akkaHttpVersion = "10.0.1"
 val sprayVersion = "1.3.4"
-val kamonVersion = "0.6.3"
+val kamonVersion = "0.6.7"
 
 lazy val commonSettings = Seq(
   homepage := Some(url("https://monsantoco.github.io/kamon-prometheus")),
   organization := "com.monsanto.arch",
   organizationHomepage := Some(url("http://engineering.monsanto.org")),
   licenses := Seq("BSD New" → url("http://opensource.org/licenses/BSD-3-Clause")),
   scalaVersion := "2.11.8",
+  crossScalaVersions := Seq("2.11.8", "2.12.2"),
   scalacOptions ++= Seq(
     "-deprecation",
     "-unchecked",
@@ -71,7 +72,6 @@ lazy val library = (project in file("library"))
     description := "Kamon module to export metrics to Prometheus",
     libraryDependencies ++= Seq(
       "io.kamon"               %% "kamon-core"               % kamonVersion,
-      "io.spray"               %% "spray-routing"            % sprayVersion     % "provided",
       "com.typesafe.akka"      %% "akka-actor"               % akkaVersion,
       "com.typesafe.akka"      %% "akka-http"                % akkaHttpVersion  % "provided",
       "com.typesafe"            % "config"                   % "1.3.1",
@@ -82,10 +82,15 @@ lazy val library = (project in file("library"))
       "com.typesafe.akka" %% "akka-slf4j"        % akkaVersion      % testConfigs,
       "com.typesafe.akka" %% "akka-testkit"      % akkaVersion      % "test",
       "org.scalatest"     %% "scalatest"         % "3.0.1"          % testConfigs,
-      "io.kamon"          %% "kamon-akka"        % kamonVersion     % "test",
-      "io.spray"          %% "spray-testkit"     % sprayVersion     % "test",
+      "io.kamon"          %% "kamon-akka-2.4"    % kamonVersion     % "test",
       "org.scalacheck"    %% "scalacheck"        % "1.13.4"         % "test"
     ),
+    libraryDependencies ++= {
+      if (scalaBinaryVersion.value == "2.11") Seq(
+        "io.spray" %% "spray-routing" % sprayVersion % "provided",
+        "io.spray" %% "spray-testkit" % sprayVersion % "test"
+      ) else Seq.empty
+    },
     dependencyOverrides ++= Set(
       "com.typesafe.akka"      %% "akka-actor"    % akkaVersion,
       "org.scala-lang"          % "scala-library" % scalaVersion.value,
@@ -105,13 +110,14 @@ lazy val demo = (project in file("demo"))
   .enablePlugins(DockerPlugin)
   .settings(
     commonSettings,
+    crossScalaVersions := Seq("2.11.8"),
     aspectjSettings,
     noPublishing,
     name := "kamon-prometheus-demo",
     description := "Docker image containing a demonstration of kamon-prometheus in action.",
     libraryDependencies ++= Seq(
-      "io.kamon"          %% "kamon-spray"          % kamonVersion,
       "io.kamon"          %% "kamon-system-metrics" % kamonVersion,
+      "io.kamon"          %% "kamon-spray"          % kamonVersion,
       "io.spray"          %% "spray-can"            % sprayVersion,
       "com.monsanto.arch" %% "spray-kamon-metrics"  % "0.1.3"
     ),
@@ -191,6 +197,7 @@ lazy val ghPagesSettings =
   )
 
 lazy val `kamon-prometheus` = (project in file("."))
+  .enablePlugins(CrossPerProjectPlugin)
   .disablePlugins(sbtassembly.AssemblyPlugin)
   .aggregate(library, demo)
   .settings(

library/src/main/scala/com/monsanto/arch/kamon/prometheus/PrometheusSettings.scala

@@ -3,7 +3,7 @@ package com.monsanto.arch.kamon.prometheus
 import com.typesafe.config.{Config, ConfigFactory}
 import kamon.util.ConfigTools.Syntax
 
-import scala.collection.JavaConversions
+import scala.collection.JavaConverters._
 import scala.concurrent.duration.FiniteDuration
 
 /** A settings object used for configuring how the extension should behave.
@@ -22,11 +22,10 @@ class PrometheusSettings(config: Config) {
 
   /** The subscriptions that determine which metrics the extension will publish to Prometheus. */
   val subscriptions: Map[String, List[String]] = {
-    import JavaConversions.asScalaBuffer
 
     val subs: Config = prometheusConfig.getConfig("subscriptions")
     subs.firstLevelKeys.map { category ⇒
-      category → subs.getStringList(category).toList
+      category → subs.getStringList(category).asScala.toList
     }.toMap
   }
 

project/plugins.sbt

@@ -4,11 +4,11 @@ addSbtPlugin("io.spray" % "sbt-revolver" % "0.8.0")
 
 addSbtPlugin("com.typesafe.sbt" % "sbt-aspectj" % "0.10.6")
 
-addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.3")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.3" exclude("org.apache.maven", "maven-plugin-api"))
 
 addSbtPlugin("se.marcuslonnberg" % "sbt-docker" % "1.4.0")
 
-addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.3.5")
+addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.5.0")
 
 addSbtPlugin("me.lessis" % "bintray-sbt" % "0.3.0")
 
@@ -22,6 +22,8 @@ addSbtPlugin("org.scoverage" % "sbt-coveralls" % "1.1.0")
 
 addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.3.3")
 
+addSbtPlugin("com.eed3si9n" % "sbt-doge" % "0.1.5")
+
 dependencyOverrides ++= Set(
   "com.typesafe.sbt" % "sbt-site" % "0.8.2"
 )