diff --git a/main/src/main/java/sbt/internal/MetaBuildLoader.java b/main/src/main/java/sbt/internal/MetaBuildLoader.java
index 86286456f..253165605 100644
--- a/main/src/main/java/sbt/internal/MetaBuildLoader.java
+++ b/main/src/main/java/sbt/internal/MetaBuildLoader.java
@@ -92,7 +92,7 @@ public final class MetaBuildLoader extends URLClassLoader {
     final TestInterfaceLoader interfaceLoader = new TestInterfaceLoader(interfaceURL, topLoader);
     final File[] siJars = scalaProvider.jars();
     final URL[] lib = new URL[1];
-    final URL[] scalaRest = new URL[siJars.length - 1];
+    final URL[] scalaRest = new URL[Math.max(0, siJars.length - 1)];
 
     {
       int i = 0;
@@ -108,6 +108,7 @@ public final class MetaBuildLoader extends URLClassLoader {
         i += 1;
       }
     }
+    assert lib[0] != null : "no scala-library.jar";
     final ScalaLibraryClassLoader libraryLoader = new ScalaLibraryClassLoader(lib, interfaceLoader);
     final FullScalaLoader fullScalaLoader = new FullScalaLoader(scalaRest, libraryLoader);
     return new MetaBuildLoader(rest, fullScalaLoader, libraryLoader, interfaceLoader);
diff --git a/sbt/src/sbt-test/dependency-management/pom-advanced/test b/sbt/src/sbt-test/dependency-management/pom-advanced/test
index 7d6449de8..1fb460f11 100644
--- a/sbt/src/sbt-test/dependency-management/pom-advanced/test
+++ b/sbt/src/sbt-test/dependency-management/pom-advanced/test
@@ -1,11 +1,10 @@
 # write the default pom.  The only repositories should be Scala Tools Releases and Snapshots
-> checkPom https://oss.sonatype.org/content/repositories/releases/ https://oss.sonatype.org/content/repositories/snapshots/
+> checkPom https://scala-ci.typesafe.com/artifactory/scala-integration/ https://scala-ci.typesafe.com/artifactory/scala-pr-validation-snapshots/ https://oss.sonatype.org/content/repositories/releases/ https://oss.sonatype.org/content/repositories/snapshots/
 
 # include file:// repositories.  The generated repositories section should include the local Maven repository as well
 $ touch repo.all
-> checkPom https://oss.sonatype.org/content/repositories/releases/ https://oss.sonatype.org/content/repositories/snapshots/ file://*.m2/repository/
+> checkPom https://scala-ci.typesafe.com/artifactory/scala-integration/ https://scala-ci.typesafe.com/artifactory/scala-pr-validation-snapshots/ https://oss.sonatype.org/content/repositories/releases/ https://oss.sonatype.org/content/repositories/snapshots/ file://*.m2/repository/
 
-# include file:// repositories.  The generated repositories section should include the local Maven repository as well
 $ delete repo.all
 $ touch repo.none
 > checkPom
diff --git a/sbt/src/test/scala/sbt/RunFromSourceMain.scala b/sbt/src/test/scala/sbt/RunFromSourceMain.scala
index 927ccc6c3..67d00c322 100644
--- a/sbt/src/test/scala/sbt/RunFromSourceMain.scala
+++ b/sbt/src/test/scala/sbt/RunFromSourceMain.scala
@@ -115,7 +115,7 @@ object RunFromSourceMain {
   private def scalaHome(bootDirectory: File, scalaVersion: String): File = {
     val log = sbt.util.LogExchange.logger("run-from-source")
     val scalaHome0 = bootDirectory / s"scala-$scalaVersion"
-    if ((scalaHome0 / "lib").exists) scalaHome0
+    if ((scalaHome0 / "lib" / "scala-library.jar").exists) scalaHome0
     else {
       log.info(s"""scalaHome ($scalaHome0) wasn't found""")
       val fakeboot = bootDirectory / "fakeboot"
@@ -129,17 +129,30 @@ object RunFromSourceMain {
         val lm = {
           import sbt.librarymanagement.ivy.IvyDependencyResolution
           val ivyConfig = InlineIvyConfiguration().withLog(log)
-          IvyDependencyResolution(ivyConfig)
+          IvyDependencyResolution(
+            ivyConfig.withResolvers(
+              ivyConfig.resolvers ++ Seq(
+                "scala-ea" at "https://scala-ci.typesafe.com/artifactory/scala-integration/",
+                "scala-pr" at "https://scala-ci.typesafe.com/artifactory/scala-pr-validation-snapshots/",
+              )
+            )
+          )
         }
-        val Name = """(.*)(\-[\d|\.]+)\.jar""".r
+        val Name = """(.*)(?:\-[\d.]+)\.jar""".r
+        val BinPre = """(.*)(?:\-[\d.]+)-(?:bin|pre)-.*\.jar""".r
         val module = "org.scala-lang" % "scala-compiler" % scalaVersion
         lm.retrieve(module, scalaModuleInfo = None, scalaHome1Temp, log) match {
+          case Left(w) => throw w.resolveException
           case Right(_) =>
-            (scalaHome1Temp ** "*.jar").get foreach { x =>
-              val Name(head, _) = x.getName
-              IO.copyFile(x, scalaHome1Lib / (head + ".jar"))
+            val jars = (scalaHome1Temp ** "*.jar").get
+            assert(jars.nonEmpty, s"no jars for scala $scalaVersion")
+            jars.foreach { f =>
+              val name = f.getName match {
+                case Name(name)   => name
+                case BinPre(name) => name
+              }
+              IO.copyFile(f, scalaHome1Lib / s"$name.jar")
             }
-          case Left(w) => sys.error(w.toString)
         }
       }
       scalaHome1
diff --git a/sbt/src/test/scala/sbt/internal/scriptedtest/ScriptedLauncher.java b/sbt/src/test/scala/sbt/internal/scriptedtest/ScriptedLauncher.java
index dbb623942..fa4ef4efd 100644
--- a/sbt/src/test/scala/sbt/internal/scriptedtest/ScriptedLauncher.java
+++ b/sbt/src/test/scala/sbt/internal/scriptedtest/ScriptedLauncher.java
@@ -32,6 +32,7 @@ import xsbti.ComponentProvider;
 import xsbti.CrossValue;
 import xsbti.GlobalLock;
 import xsbti.Launcher;
+import xsbti.MavenRepository;
 import xsbti.Predefined;
 import xsbti.PredefinedRepository;
 import xsbti.Repository;
@@ -335,8 +336,15 @@ public class ScriptedLauncher {
                 private final ScalaProvider sp = this;
                 private final String scalaOrg = "org.scala-lang";
                 private final Repository[] repos =
-                    new PredefinedRepository[] {
-                      () -> Predefined.Local, () -> Predefined.MavenCentral
+                    new Repository[] {
+                      (PredefinedRepository) () -> Predefined.Local,
+                      (PredefinedRepository) () -> Predefined.MavenCentral,
+                      newMavenRepo(
+                          "scala-ea",
+                          "https://scala-ci.typesafe.com/artifactory/scala-integration/"),
+                      newMavenRepo(
+                          "scala-pr",
+                          "https://scala-ci.typesafe.com/artifactory/scala-pr-validation-snapshots/")
                     };
                 private final Launcher launcher =
                     new Launcher() {
@@ -544,4 +552,22 @@ public class ScriptedLauncher {
     } catch (final IOException e) {
     }
   }
+
+  private static MavenRepository newMavenRepo(final String id, final String url) {
+    return new MavenRepository() {
+      @Override
+      public String id() {
+        return id;
+      }
+
+      @Override
+      public URL url() {
+        try {
+          return new URL(url);
+        } catch (MalformedURLException e) {
+          throw new RuntimeException(e);
+        }
+      }
+    };
+  }
 }