Trying to cross compile a project to Scala 2.11 fails with "error while loading Object, Missing dependency 'object scala in compiler mirror'"

Question

I'm trying to compile my project to Scala 2.10 and 2.11 so that I can release versions for both scala versions, but every time I try to do it it fails with the following message:

#( 04/26/14@ 7:40 )( mauricio@Mauricios-MacBook-Pro ):~/projects/scala/[email protected]✔
   sbt compile
[info] Loading project definition from /Users/mauricio/projects/scala/postgresql-netty/project
[info] Set current project to db-async-base (in build file:/Users/mauricio/projects/scala/postgresql-netty/)
[info] Compiling 61 Scala sources and 1 Java source to /Users/mauricio/projects/scala/postgresql-netty/db-async-common/target/scala-2.11/classes...
[error] error while loading Object, Missing dependency 'object scala in compiler mirror', required by /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/rt.jar(java/lang/Object.class)
scala.reflect.internal.MissingRequirementError: object scala in compiler mirror not found.
    at scala.reflect.internal.MissingRequirementError$.signal(MissingRequirementError.scala:17)
    at scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:18)
    at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:53)
    at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:66)
    at scala.reflect.internal.Mirrors$RootsBase.getPackage(Mirrors.scala:173)
    at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackage$lzycompute(Definitions.scala:161)
    at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackage(Definitions.scala:161)
    at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackageClass$lzycompute(Definitions.scala:162)
    at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackageClass(Definitions.scala:162)
    at scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1375)
    at scala.tools.nsc.Global$Run.<init>(Global.scala:1278)
    at xsbt.CachedCompiler0$$anon$2.<init>(CompilerInterface.scala:113)
    at xsbt.CachedCompiler0.run(CompilerInterface.scala:113)
    at xsbt.CachedCompiler0.run(CompilerInterface.scala:99)
    at xsbt.CompilerInterface.run(CompilerInterface.scala:27)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:102)
    at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:48)
    at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41)
    at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply$mcV$sp(AggressiveCompile.scala:99)
    at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply(AggressiveCompile.scala:99)
    at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply(AggressiveCompile.scala:99)
    at sbt.compiler.AggressiveCompile.sbt$compiler$AggressiveCompile$$timed(AggressiveCompile.scala:166)
    at sbt.compiler.AggressiveCompile$$anonfun$3.compileScala$1(AggressiveCompile.scala:98)
    at sbt.compiler.AggressiveCompile$$anonfun$3.apply(AggressiveCompile.scala:143)
    at sbt.compiler.AggressiveCompile$$anonfun$3.apply(AggressiveCompile.scala:87)
    at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:39)
    at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:37)
    at sbt.inc.IncrementalCommon.cycle(Incremental.scala:99)
    at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:38)
    at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:37)
    at sbt.inc.Incremental$.manageClassfiles(Incremental.scala:65)
    at sbt.inc.Incremental$.compile(Incremental.scala:37)
    at sbt.inc.IncrementalCompile$.apply(Compile.scala:27)
    at sbt.compiler.AggressiveCompile.compile2(AggressiveCompile.scala:157)
    at sbt.compiler.AggressiveCompile.compile1(AggressiveCompile.scala:71)
    at sbt.compiler.AggressiveCompile.apply(AggressiveCompile.scala:46)
    at sbt.Compiler$.apply(Compiler.scala:75)
    at sbt.Compiler$.apply(Compiler.scala:66)
    at sbt.Defaults$.sbt$Defaults$$compileTaskImpl(Defaults.scala:743)
    at sbt.Defaults$$anonfun$compileTask$1.apply(Defaults.scala:735)
    at sbt.Defaults$$anonfun$compileTask$1.apply(Defaults.scala:735)
    at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
    at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:42)
    at sbt.std.Transform$$anon$4.work(System.scala:64)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
    at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:18)
    at sbt.Execute.work(Execute.scala:244)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
    at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:160)
    at sbt.CompletionService$$anon$2.call(CompletionService.scala:30)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
[error] (db-async-common/compile:compile) scala.reflect.internal.MissingRequirementError: object scala in compiler mirror not found.
[error] Total time: 2 s, completed Apr 26, 2014 7:43:49 PM

My build file looks like this:

import sbt._
import Keys._

object ProjectBuild extends Build {

  val commonName = "db-async-common"
  val postgresqlName = "postgresql-async"
  val mysqlName = "mysql-async"

  lazy val root = Project(
    id = "db-async-base",
    base = file("."),
    settings = Configuration.baseSettings,
    aggregate = Seq(common, postgresql, mysql)
  )

  lazy val common = Project(
    id = commonName,
    base = file(commonName),
    settings = Configuration.baseSettings ++ Seq(
      name := commonName,
      libraryDependencies := Configuration.commonDependencies
    )
  )

  lazy val postgresql = Project(
    id = postgresqlName,
    base = file(postgresqlName),
    settings = Configuration.baseSettings ++ Seq(
      name := postgresqlName,
      libraryDependencies ++= Configuration.implementationDependencies
    )
  ) aggregate (common) dependsOn (common)

  lazy val mysql = Project(
    id = mysqlName,
    base = file(mysqlName),
    settings = Configuration.baseSettings ++ Seq(
      name := mysqlName,
      libraryDependencies ++= Configuration.implementationDependencies
    )
  ) aggregate (common) dependsOn (common)

}

object Configuration {

  val commonVersion = "0.2.13"
  val projectScalaVersion = "2.11.0"

  val specs2Dependency = "org.specs2" %% "specs2" % "2.3.11" % "test"
  val logbackDependency = "ch.qos.logback" % "logback-classic" % "1.0.13" % "test"

  val commonDependencies = Seq(
    "org.slf4j" % "slf4j-api" % "1.7.5",
    "joda-time" % "joda-time" % "2.3",
    "org.joda" % "joda-convert" % "1.5",
    "io.netty" % "netty-all" % "4.0.18.Final",
    "org.javassist" % "javassist" % "3.18.1-GA",
    specs2Dependency,
    logbackDependency
  )

  val implementationDependencies = Seq(
    specs2Dependency,
    logbackDependency
  )

  val baseSettings = Defaults.defaultSettings ++ Seq(
    scalacOptions :=
      Opts.compile.encoding("UTF8")
        :+ Opts.compile.deprecation
        :+ Opts.compile.unchecked
        :+ "-feature"
    ,
    scalacOptions in doc := Seq("-doc-external-doc:scala=http://www.scala-lang.org/archives/downloads/distrib/files/nightly/docs/library/"),
    scalaVersion := projectScalaVersion,
    crossScalaVersions := Seq(projectScalaVersion, "2.10.4"),
    javacOptions := Seq("-source", "1.6", "-target", "1.6", "-encoding", "UTF8"),
    organization := "com.github.mauricio",
    version := commonVersion,
    parallelExecution := false,
    publishArtifact in Test := false,
    publishMavenStyle := true,
    pomIncludeRepository := {
      _ => false
    },
    publishTo <<= version {
      v: String =>
        val nexus = "https://oss.sonatype.org/"
        if (v.trim.endsWith("SNAPSHOT"))
          Some("snapshots" at nexus + "content/repositories/snapshots")
        else
          Some("releases" at nexus + "service/local/staging/deploy/maven2")
    },
    pomExtra := (
      <url>https://github.com/mauricio/postgresql-async</url>
        <licenses>
          <license>
            <name>APACHE-2.0</name>
            <url>http://www.apache.org/licenses/LICENSE-2.0</url>
            <distribution>repo</distribution>
          </license>
        </licenses>
        <scm>
          <url>[email protected]:mauricio/postgresql-netty.git</url>
          <connection>scm:git:[email protected]:mauricio/postgresql-netty.git</connection>
        </scm>
        <developers>
          <developer>
            <id>mauricio</id>
            <name>Maurício Linhares</name>
            <url>https://github.com/mauricio</url>
          </developer>
        </developers>
      )
  )

}

And if you'd like to pull the source to check it's at this branch on Github.

Any info on trying to fix this would be very helpful.

Rockfish

Answer 1

The problem is very simple, in your Build.scala, you did almost all right, but in commons project you had overridden default commonDependencies. By default it contains dependency to scala-library.

This piece of code

lazy val common = Project(
    id = commonName,
    base = file(commonName),
    settings = Configuration.baseSettings ++ Seq(
      name := commonName,
      libraryDependencies := Configuration.commonDependencies // #1
    )
  )

at the element marked as #1 should have

libraryDependencies ++= Configuration.commonDependencies

Ps. I've sent you a pull request with the fix.

Trichiasis

Thanks, I'll check it out and come back here! – Healey

@MaurícioLinhares any news on this one - did it help? – Trichiasis

Now it builds, but when I execute sbt publish-local it only publishes the 2.10 version, doesn't build the 2.11 one. – Healey

Ignore me, forgot it had to be sbt + publish-local, now it's all working. Thanks for the PR and for figuring out the actual issue! – Healey

Answer 2

I was getting this error when trying to use the Oracle Java 9 jvm on Ubuntu with sbt. Using the Java 8 jvm worked for me, though.

Thurmond

Ha! Fixed it for me – Ulm

Answer 3

I think you answered before your questions Multimodule project build with SBT breaks with weird error

In this build add a line "org.scala-lang" % "scala-library" % projectScalaVersion,:

 val commonDependencies = Seq(
    ..
    "org.joda" % "joda-convert" % "1.5",
    "org.scala-lang" % "scala-library" % projectScalaVersion,
    "io.netty" % "netty-all" % "4.0.18.Final",
    ...
  )

Windage

I checked both branches and in current "org.scala-lang" % "scala-library" % projectScalaVersion is missing. I tried to build with this line with success. – Windage

I forked and added line to build: postgresql-async – Windage

Answer 4

In Build.scala I would add autoScalaLibrary := true:

lazy val common = Project(
    id = commonName,
    base = file(commonName),
    settings = Configuration.baseSettings ++ Seq(
      ...
      autoScalaLibrary := true,
      ...
    )
  )

Mccullum

Answer 5

This problem was solved for me when using intellij, by closing the project and reimporting it, and selecting sbt as the build system in settings.

Why oh why did I choose SBT?? Now I'm stuck with a very brittle build system. Thank God that atleast intellij does it right.

sbt version: 0.13.15

scala version: 2.12.1

Innsbruck