Why does IntelliJ IDEA debugger jump to wrong Scala version library? - scala

Question

I am using IntelliJ IDEA 13.1.2 with the Scala plugin version 0.36.431 on Windows 7 with sbt 0.13.1.
The following project definition build.sbt has no references to any Scala version other than 2.9.3.
import sbt._
import Keys._
import AssemblyKeys._
import NativePackagerKeys._
name := "simplews"
version := "0.1.0-SNAPSHOT"
val sparkVersion = "0.8.1-incubating"
scalaVersion := "2.9.3"
val akkaVersion = "2.0.5"
libraryDependencies ++= Seq(
"org.apache.spark" % "spark-core_2.9.3" % sparkVersion % "compile->default" withSources(),
"org.apache.spark" % "spark-examples_2.9.3" % sparkVersion % "compile->default" withSources(),
"org.apache.spark" % "spark-tools_2.9.3" % sparkVersion % "compile->default" withSources(),
"org.scalatest" % "scalatest_2.9.3" % "1.9.2" % "test" withSources(),
"org.apache.spark" % "spark-repl_2.9.3" % sparkVersion % "compile->default" withSources(),
"org.apache.kafka" % "kafka" % "0.7.2-spark",
"com.thenewmotion.akka" % "akka-rabbitmq_2.9.2" % "0.0.2" % "compile->default" withSources(),
"com.typesafe.akka" % "akka-actor" % akkaVersion % "compile->default" withSources(),
"com.typesafe.akka" % "akka-testkit" % akkaVersion % "compile->default" withSources(),
"com.rabbitmq" % "amqp-client" % "3.0.1" % "compile->default" withSources(),
"org.specs2" % "specs2_2.9.3" % "1.12.4.1" % "compile->default" withSources(),
"com.nebhale.jsonpath" % "jsonpath" % "1.2" % "compile->default" withSources(),
"org.mockito" % "mockito-all" % "1.8.5",
"junit" % "junit" % "4.11"
)
packagerSettings
packageArchetype.java_application
resolvers ++= Seq(
"Apache repo" at "https://repository.apache.org/content/repositories/releases",
"Cloudera repo" at "https://repository.cloudera.com/artifactory/repo/org/apache/kafka/kafka/0.7.2-spark/",
"akka rabbitmq" at "http://nexus.thenewmotion.com/content/repositories/releases-public",
"Local Repo" at Path.userHome.asFile.toURI.toURL + "/.m2/repository",
Resolver.mavenLocal
)
However as seen in the screenshot the debugger has jumped to scala 2.10.2. Note: the debugger is correctly going to 2.9.3 for some other debugging.
Here is project/plugins.sbt:
resolvers += "sbt-plugins" at "http://scalasbt.artifactoryonline.com/scalasbt/sbt-plugin-releases"
addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "0.7.0-RC2")
addSbtPlugin("com.github.mpeltonen" % "sbt-idea" % "1.6.0")
addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.11.2")
EDIT In order to reproduce it is necessary to do a mvn local install on one or two libraries that are not available in any public repo.
mvn org.apache.maven.plugins:maven-install-plugin:2.5.1:install-file -Dfile=c:\shared\kafka-0.7.2-spark.jar -DgroupId=org.apache.kafka -DartifactId=kafka -Dversion=0.7.2-spark -Dpackaging=jar
I had in any case not considered someone (om-nom-nom !) would attempt an exact reproduction - so had also omitted otherwise extraneous items like mergeStrategy and assemblyKeys.
A fully independent reproducible setup may be a bit in coming - I have been under rather quite heavy demands here.