Using `s3-support` from mill

[xeppaka]

Trying to use s3-support from mill and getting exception: java.lang.ClassNotFoundException: com.amazonaws.services.s3.AmazonS3.

The build.sc looks like:

import mill._
import scalalib._
import coursier.maven.MavenRepository
import $ivy.`io.get-coursier:s3-support:0.2.0`
import $ivy.`com.amazonaws:aws-java-sdk-s3:1.12.506`

coursier.s3support.s3.Setup.setup()

case object Versions {
  val catsVersion = "2.9.0"
  val catsEffectVersion = "3.5.0"
}

case object Dependencies {
  import Versions._

  val common = ivy"tech.xeppaka::common:0.41.0"
  val catsCore = ivy"org.typelevel::cats-core:$catsVersion"
  val catsEffect = ivy"org.typelevel::cats-effect:$catsEffectVersion"
}

object `effects-app-001` extends RootModule with SbtModule {
  def scalaVersion = "2.13.11"
  def ivyDeps =
    Agg(Dependencies.catsCore, Dependencies.catsEffect, Dependencies.common)

  def repositoriesTask = T.task {
    super.repositoriesTask() ++ Seq(
      MavenRepository(
        "s3://bucket-with-artifacts/m2/releases"
      )
    )
  }
}

I think the problem is that Thread.currentThread().getContextClassLoader() is used to load AmazonS3 class. Could you consider using getClass().getClassLoader() or accept a ClassLoader as parameter to coursier.s3support.s3.Setup.setup() instead?

There is also good info on stackoverflow regarding class loader: https://stackoverflow.com/questions/1771679/difference-between-threads-context-class-loader-and-normal-classloader