Why is SBT unable to resolve my dependency?

ivy, maven, sbt

Solution

As I explained in the ticket you opened, what's happening is that Ivy is finding the `pom.xml` file in a particular resolver (in this case maven-central) but is unable to find the jar file there. This leads ivy to give up completely on resolution rather than just marking that resolver as bad and moving on.

What you need to do is ensure that the "good" resolvers you want are ordered before your "bad" resolvers. You can see the ordered list of resovlers sbt is going to use via the `show fullResolvers` command. Here's an example:

> show fullResolvers
[info] ArrayBuffer(Raw(ProjectResolver(inter-project, mapped: )), URLRepository(typesafe-ivy-releases,Patterns(ivyPatterns=List(http://repo.typesafe.com/typesafe/ivy-releases/[organisation]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]), artifactPatterns=List(http://repo.typesafe.com/typesafe/ivy-releases/[organisation]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]), isMavenCompatible=false, descriptorOptional=false, skipConsistencyCheck=false)), URLRepository(sbt-plugin-releases,Patterns(ivyPatterns=List(http://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/[organisation]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]), artifactPatterns=List(http://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/[organisation]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]), isMavenCompatible=false, descriptorOptional=false, skipConsistencyCheck=false)), FileRepository(local,FileConfiguration(true,None),Patterns(ivyPatterns=List(${ivy.home}/local/[organisation]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]), artifactPatterns=List(${ivy.home}/local/[organisation]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]), isMavenCompatible=false, descriptorOptional=false, skipConsistencyCheck=false)), public: http://repo1.maven.org/maven2/)

Unfortunately, this output is just unreadable for humans right now. (Please open a ticket for the `export` command to support `fullResolvers`, and I can improve the debugging in the future). However, we can do some poor man's debugging, add this to `build.sbt`:

val exportFullResolvers = taskKey[Unit]("debug resolvers")

exportFullResolvers := {
  for {
   (resolver,idx) <- fullResolvers.value.zipWithIndex
  } println(s"${idx}.  ${resolver.name}")
}

Now, you can run this task inside your sbt build to figure out/toy with resolver orderings:

> exportFullResolvers
0.  inter-project
1.  typesafe-ivy-releases
2.  sbt-plugin-releases
3.  local
4.  public
[success] Total time: 0 s, completed Feb 26, 2014 6:10:07 PM

You'll want to modify the resolvers such that inter-project comes first, but "public" (maven central) comes after the jboss resolver. You can modify the resovlers inline in build.sbt via:

fullResolvers := {
  val previous = fullResolvers.value
  previous.sortWith { (lhs, rhs) =>  ??? /* You define something here */ }
}

Problem

Original source