diff --git a/.travis.yml b/.travis.yml
index b0026deac..d180a58ff 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,7 +26,9 @@ env:
     - SBT_CMD="scripted java/* package/* reporter/* run/* project-load/*"
     - SBT_CMD="scripted project/*1of2"
     - SBT_CMD="scripted project/*2of2"
-    - SBT_CMD="scripted source-dependencies/*"
+    - SBT_CMD="scripted source-dependencies/*1of3"
+    - SBT_CMD="scripted source-dependencies/*2of3"
+    - SBT_CMD="scripted source-dependencies/*3of3"
     - SBT_CMD="scripted tests/*"
     - SBT_CMD="repoOverrideTest:scripted dependency-management/*"
 
diff --git a/build.sbt b/build.sbt
index 2be47d5f0..2affa420a 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,6 +1,7 @@
 import Util._
 import Dependencies._
 import Sxr.sxr
+import com.typesafe.tools.mima.core._, ProblemFilters._
 
 // ThisBuild settings take lower precedence,
 // but can be shared across the multi projects.
@@ -66,7 +67,7 @@ def testedBaseSettings: Seq[Setting[_]] =
 
 val mimaSettings = Def settings (
   mimaPreviousArtifacts := Set(
-    organization.value % moduleName.value % "1.0.0-RC3"
+    organization.value % moduleName.value % "1.0.0"
       cross (if (crossPaths.value) CrossVersion.binary else CrossVersion.disabled)
   )
 )
@@ -382,9 +383,18 @@ lazy val sbtProj = (project in file("sbt"))
     crossScalaVersions := Seq(baseScalaVersion),
     crossPaths := false,
     mimaSettings,
+    mimaBinaryIssueFilters ++= sbtIgnoredProblems,
   )
   .configure(addSbtCompilerBridge)
 
+lazy val sbtIgnoredProblems = {
+  Seq(
+    // Added more items to Import trait.
+    exclude[ReversedMissingMethodProblem]("sbt.Import.sbt$Import$_setter_$WatchSource_="),
+    exclude[ReversedMissingMethodProblem]("sbt.Import.WatchSource")
+  )
+}
+
 def scriptedTask: Def.Initialize[InputTask[Unit]] = Def.inputTask {
   val result = scriptedSource(dir => (s: State) => Scripted.scriptedParser(dir)).parsed
   // publishLocalBinAll.value // TODO: Restore scripted needing only binary jars.
diff --git a/main-command/src/main/scala/sbt/Watched.scala b/main-command/src/main/scala/sbt/Watched.scala
index d65a32708..08a1c5838 100644
--- a/main-command/src/main/scala/sbt/Watched.scala
+++ b/main-command/src/main/scala/sbt/Watched.scala
@@ -6,11 +6,12 @@ package sbt
 import BasicCommandStrings.ClearOnFailure
 import State.FailureWall
 import annotation.tailrec
+import java.io.File
 import java.nio.file.FileSystems
 
 import scala.concurrent.duration._
 
-import sbt.io.WatchService
+import sbt.io.{ AllPassFilter, NothingFilter, FileFilter, WatchService }
 import sbt.internal.io.{ Source, SourceModificationWatch, WatchState }
 import sbt.internal.util.AttributeKey
 import sbt.internal.util.Types.const
@@ -18,7 +19,7 @@ import sbt.internal.util.Types.const
 trait Watched {
 
   /** The files watched when an action is run with a preceeding ~ */
-  def watchSources(s: State): Seq[Source] = Nil
+  def watchSources(s: State): Seq[Watched.WatchSource] = Nil
   def terminateWatch(key: Int): Boolean = Watched.isEnter(key)
 
   /**
@@ -44,6 +45,30 @@ object Watched {
   val clearWhenTriggered: WatchState => String = const(clearScreen)
   def clearScreen: String = "\u001b[2J\u001b[0;0H"
 
+  type WatchSource = Source
+  object WatchSource {
+
+    /**
+     * Creates a new `WatchSource` for watching files, with the given filters.
+     *
+     * @param base          The base directory from which to include files.
+     * @param includeFilter Choose what children of `base` to include.
+     * @param excludeFilter Choose what children of `base` to exclude.
+     * @return An instance of `Source`.
+     */
+    def apply(base: File, includeFilter: FileFilter, excludeFilter: FileFilter): Source =
+      new Source(base, includeFilter, excludeFilter)
+
+    /**
+     * Creates a new `WatchSource` for watching files.
+     *
+     * @param base          The base directory from which to include files.
+     * @return An instance of `Source`.
+     */
+    def apply(base: File): Source =
+      apply(base, AllPassFilter, NothingFilter)
+  }
+
   private[this] class AWatched extends Watched
 
   def multi(base: Watched, paths: Seq[Watched]): Watched =
diff --git a/main-settings/src/main/scala/sbt/Append.scala b/main-settings/src/main/scala/sbt/Append.scala
index 4b2c1987f..bb50f52fa 100644
--- a/main-settings/src/main/scala/sbt/Append.scala
+++ b/main-settings/src/main/scala/sbt/Append.scala
@@ -6,6 +6,8 @@ import scala.annotation.implicitNotFound
 import sbt.internal.util.Attributed
 import Def.Initialize
 import reflect.internal.annotations.compileTimeOnly
+import sbt.internal.io.Source
+import sbt.io.{ AllPassFilter, NothingFilter }
 
 object Append {
   @implicitNotFound(
@@ -96,4 +98,11 @@ object Append {
       def appendValue(a: Seq[T], b: Option[T]): Seq[T] = b.fold(a)(a :+ _)
       def appendValues(a: Seq[T], b: Option[T]): Seq[T] = b.fold(a)(a :+ _)
     }
+  implicit def appendSource: Sequence[Seq[Source], Seq[File], File] =
+    new Sequence[Seq[Source], Seq[File], File] {
+      def appendValue(a: Seq[Source], b: File): Seq[Source] =
+        appendValues(a, Seq(b))
+      def appendValues(a: Seq[Source], b: Seq[File]): Seq[Source] =
+        a ++ b.map(new Source(_, AllPassFilter, NothingFilter))
+    }
 }
diff --git a/main/src/main/scala/sbt/BackgroundJobService.scala b/main/src/main/scala/sbt/BackgroundJobService.scala
index 58d3f25e1..7b7b30955 100644
--- a/main/src/main/scala/sbt/BackgroundJobService.scala
+++ b/main/src/main/scala/sbt/BackgroundJobService.scala
@@ -5,6 +5,7 @@ import sbt.util.Logger
 import Def.{ ScopedKey, Classpath }
 import sbt.internal.util.complete._
 import java.io.File
+import scala.util.Try
 
 abstract class BackgroundJobService extends Closeable {
 
@@ -24,6 +25,12 @@ abstract class BackgroundJobService extends Closeable {
   def shutdown(): Unit
   def jobs: Vector[JobHandle]
   def stop(job: JobHandle): Unit
+
+  def waitForTry(job: JobHandle): Try[Unit] = {
+    // This implementation is provided only for backward compatibility.
+    Try(waitFor(job))
+  }
+
   def waitFor(job: JobHandle): Unit
 
   /** Copies classpath to temporary directories. */
diff --git a/main/src/main/scala/sbt/Cross.scala b/main/src/main/scala/sbt/Cross.scala
index 599ece90d..8cd7720b7 100644
--- a/main/src/main/scala/sbt/Cross.scala
+++ b/main/src/main/scala/sbt/Cross.scala
@@ -3,7 +3,7 @@
  */
 package sbt
 
-import Keys._
+import Keys.{ version, _ }
 import sbt.internal.util.complete.{ DefaultParsers, Parser }
 import sbt.internal.util.AttributeKey
 import DefaultParsers._
@@ -18,6 +18,7 @@ import sbt.internal.CommandStrings.{
 }
 import java.io.File
 
+import sbt.internal.Act
 import sbt.internal.inc.ScalaInstance
 import sbt.io.IO
 import sbt.librarymanagement.CrossVersion
@@ -125,10 +126,13 @@ object Cross {
       case Left(cmd) => (resolveAggregates(x), cmd)
     }
 
+    val projCrossVersions = aggs map { proj =>
+      proj -> crossVersions(x, proj)
+    }
     // if we support scalaVersion, projVersions should be cached somewhere since
     // running ++2.11.1 is at the root level is going to mess with the scalaVersion for the aggregated subproj
-    val projVersions = (aggs flatMap { proj =>
-      crossVersions(x, proj) map { (proj.project, _) }
+    val projVersions = (projCrossVersions flatMap {
+      case (proj, versions) => versions map { proj.project -> _ }
     }).toList
 
     val verbose = if (args.verbose) "-v" else ""
@@ -136,19 +140,51 @@ object Cross {
     if (projVersions.isEmpty) {
       state
     } else {
-      // Group all the projects by scala version
-      val allCommands = projVersions.groupBy(_._2).mapValues(_.map(_._1)).toSeq.flatMap {
-        case (version, Seq(project)) =>
-          // If only one project for a version, issue it directly
-          Seq(s"$SwitchCommand $verbose $version $project/$aggCommand")
-        case (version, projects) if aggCommand.contains(" ") =>
-          // If the command contains a space, then the all command won't work because it doesn't support issuing
-          // commands with spaces, so revert to running the command on each project one at a time
-          s"$SwitchCommand $verbose $version" :: projects.map(project => s"$project/$aggCommand")
-        case (version, projects) =>
-          // First switch scala version, then use the all command to run the command on each project concurrently
-          Seq(s"$SwitchCommand $verbose $version",
-              projects.map(_ + "/" + aggCommand).mkString("all ", " ", ""))
+      // Detect whether a task or command has been issued
+      val allCommands = Parser.parse(aggCommand, Act.aggregatedKeyParser(x)) match {
+        case Left(_) =>
+          // It's definitely not a task, check if it's a valid command, because we don't want to emit the warning
+          // message below for typos.
+          val validCommand = Parser.parse(aggCommand, state.combinedParser).isRight
+
+          val distinctCrossConfigs = projCrossVersions.map(_._2.toSet).distinct
+          if (validCommand && distinctCrossConfigs.size > 1) {
+            state.log.warn(
+              "Issuing a cross building command, but not all sub projects have the same cross build " +
+                "configuration. This could result in subprojects cross building against Scala versions that they are " +
+                "not compatible with. Try issuing cross building command with tasks instead, since sbt will be able " +
+                "to ensure that cross building is only done using configured project and Scala version combinations " +
+                "that are configured.")
+            state.log.debug("Scala versions configuration is:")
+            projCrossVersions.foreach {
+              case (project, versions) => state.log.debug(s"$project: $versions")
+            }
+          }
+
+          // Execute using a blanket switch
+          projCrossVersions.toMap.apply(currentRef).flatMap { version =>
+            // Force scala version
+            Seq(s"$SwitchCommand $verbose $version!", aggCommand)
+          }
+
+        case Right(_) =>
+          // We have a key, we're likely to be able to cross build this using the per project behaviour.
+
+          // Group all the projects by scala version
+          projVersions.groupBy(_._2).mapValues(_.map(_._1)).toSeq.flatMap {
+            case (version, Seq(project)) =>
+              // If only one project for a version, issue it directly
+              Seq(s"$SwitchCommand $verbose $version $project/$aggCommand")
+            case (version, projects) if aggCommand.contains(" ") =>
+              // If the command contains a space, then the `all` command won't work because it doesn't support issuing
+              // commands with spaces, so revert to running the command on each project one at a time
+              s"$SwitchCommand $verbose $version" :: projects.map(project =>
+                s"$project/$aggCommand")
+            case (version, projects) =>
+              // First switch scala version, then use the all command to run the command on each project concurrently
+              Seq(s"$SwitchCommand $verbose $version",
+                  projects.map(_ + "/" + aggCommand).mkString("all ", " ", ""))
+          }
       }
 
       allCommands.toList ::: CrossRestoreSessionCommand :: captureCurrentSession(state, x)
diff --git a/main/src/main/scala/sbt/Defaults.scala b/main/src/main/scala/sbt/Defaults.scala
index d2153cc41..d4f5ba1f2 100755
--- a/main/src/main/scala/sbt/Defaults.scala
+++ b/main/src/main/scala/sbt/Defaults.scala
@@ -316,7 +316,9 @@ object Defaults extends BuildCommon {
                                      includeFilter in unmanagedSources,
                                      excludeFilter in unmanagedSources).value,
     watchSources in ConfigGlobal ++= {
-      val bases = unmanagedSourceDirectories.value
+      val baseDir = baseDirectory.value
+      val bases = unmanagedSourceDirectories.value ++ (if (sourcesInBase.value) Seq(baseDir)
+                                                       else Seq.empty)
       val include = (includeFilter in unmanagedSources).value
       val exclude = (excludeFilter in unmanagedSources).value
       bases.map(b => new Source(b, include, exclude))
@@ -388,14 +390,7 @@ object Defaults extends BuildCommon {
       val _ = clean.value
       IvyActions.cleanCachedResolutionCache(ivyModule.value, streams.value.log)
     },
-    scalaCompilerBridgeSource := {
-      if (ScalaInstance.isDotty(scalaVersion.value))
-        // Maintained at https://github.com/lampepfl/dotty/tree/master/sbt-bridge
-        ModuleID(scalaOrganization.value, "dotty-sbt-bridge", scalaVersion.value)
-          .withConfigurations(Some("component"))
-          .sources()
-      else ZincUtil.getDefaultBridgeModule(scalaVersion.value)
-    }
+    scalaCompilerBridgeSource := ZincUtil.getDefaultBridgeModule(scalaVersion.value)
   )
   // must be a val: duplication detected by object identity
   private[this] lazy val compileBaseGlobal: Seq[Setting[_]] = globalDefaults(
@@ -501,8 +496,8 @@ object Defaults extends BuildCommon {
     selectMainClass := mainClass.value orElse askForMainClass(discoveredMainClasses.value),
     mainClass in run := (selectMainClass in run).value,
     mainClass := pickMainClassOrWarn(discoveredMainClasses.value, streams.value.log),
-    runMain := runMainTask(fullClasspath, runner in run).evaluated,
-    run := runTask(fullClasspath, mainClass in run, runner in run).evaluated,
+    runMain := foregroundRunMainTask.evaluated,
+    run := foregroundRunTask.evaluated,
     copyResources := copyResourcesTask.value,
     // note that we use the same runner and mainClass as plain run
     bgRunMain := bgRunMainTask(exportedProductJars,
@@ -1166,14 +1161,14 @@ object Defaults extends BuildCommon {
     Def.inputTask {
       val handle = bgRunMain.evaluated
       val service = bgJobService.value
-      service.waitFor(handle)
+      service.waitForTry(handle).get
     }
   // run calls bgRun in the background and waits for the result.
   def foregroundRunTask: Initialize[InputTask[Unit]] =
     Def.inputTask {
       val handle = bgRun.evaluated
       val service = bgJobService.value
-      service.waitFor(handle)
+      service.waitForTry(handle).get
     }
   def runMainTask(classpath: Initialize[Task[Classpath]],
                   scalaRun: Initialize[Task[ScalaRun]]): Initialize[InputTask[Unit]] = {
@@ -1538,8 +1533,11 @@ object Defaults extends BuildCommon {
   lazy val configSettings
     : Seq[Setting[_]] = Classpaths.configSettings ++ configTasks ++ configPaths ++ packageConfig ++ Classpaths.compilerPluginConfig ++ deprecationSettings
 
-  lazy val compileSettings
-    : Seq[Setting[_]] = configSettings ++ (mainBgRunMainTask +: mainBgRunTask +: addBaseSources) ++ Classpaths.addUnmanagedLibrary
+  lazy val compileSettings: Seq[Setting[_]] =
+    configSettings ++
+      (mainBgRunMainTask +: mainBgRunTask +: addBaseSources) ++
+      Classpaths.addUnmanagedLibrary
+
   lazy val testSettings: Seq[Setting[_]] = configSettings ++ testTasks
 
   lazy val itSettings: Seq[Setting[_]] = inConfig(IntegrationTest)(testSettings)
@@ -2961,7 +2959,7 @@ trait BuildExtra extends BuildCommon with DefExtra {
    */
   def addSbtPlugin(dependency: ModuleID): Setting[Seq[ModuleID]] =
     libraryDependencies += {
-      val sbtV = (sbtBinaryVersion in update).value
+      val sbtV = (sbtBinaryVersion in pluginCrossBuild).value
       val scalaV = (scalaBinaryVersion in update).value
       sbtPluginExtra(dependency, sbtV, scalaV)
     }
diff --git a/main/src/main/scala/sbt/Keys.scala b/main/src/main/scala/sbt/Keys.scala
index d85a131fc..a011fd938 100644
--- a/main/src/main/scala/sbt/Keys.scala
+++ b/main/src/main/scala/sbt/Keys.scala
@@ -37,7 +37,7 @@ import sbt.internal.{
   LogManager
 }
 import sbt.io.{ FileFilter, WatchService }
-import sbt.internal.io.{ Source, WatchState }
+import sbt.internal.io.WatchState
 import sbt.internal.util.{ AttributeKey, SourcePosition }
 
 import sbt.librarymanagement.Configurations.CompilerPlugin
@@ -132,8 +132,8 @@ object Keys {
   val suppressSbtShellNotification = settingKey[Boolean]("""True to suppress the "Executing in batch mode.." message.""").withRank(CSetting)
   val pollInterval = settingKey[FiniteDuration]("Interval between checks for modified sources by the continuous execution command.").withRank(BMinusSetting)
   val watchService = settingKey[() => WatchService]("Service to use to monitor file system changes.").withRank(BMinusSetting)
-  val watchSources = taskKey[Seq[Source]]("Defines the sources in this project for continuous execution to watch for changes.").withRank(BMinusSetting)
-  val watchTransitiveSources = taskKey[Seq[Source]]("Defines the sources in all projects for continuous execution to watch.").withRank(CSetting)
+  val watchSources = taskKey[Seq[Watched.WatchSource]]("Defines the sources in this project for continuous execution to watch for changes.").withRank(BMinusSetting)
+  val watchTransitiveSources = taskKey[Seq[Watched.WatchSource]]("Defines the sources in all projects for continuous execution to watch.").withRank(CSetting)
   val watchingMessage = settingKey[WatchState => String]("The message to show when triggered execution waits for sources to change.").withRank(DSetting)
   val triggeredMessage = settingKey[WatchState => String]("The message to show before triggered execution executes an action after sources change.").withRank(DSetting)
 
diff --git a/main/src/main/scala/sbt/internal/DefaultBackgroundJobService.scala b/main/src/main/scala/sbt/internal/DefaultBackgroundJobService.scala
index b2680a729..ea08836a9 100644
--- a/main/src/main/scala/sbt/internal/DefaultBackgroundJobService.scala
+++ b/main/src/main/scala/sbt/internal/DefaultBackgroundJobService.scala
@@ -5,6 +5,7 @@ import java.util.concurrent.atomic.AtomicLong
 import java.io.Closeable
 import Def.{ ScopedKey, Setting, Classpath }
 import scala.concurrent.ExecutionContext
+import scala.util.Try
 import Scope.GlobalScope
 import java.io.File
 import sbt.io.{ IO, Hash }
@@ -18,6 +19,13 @@ import sbt.internal.util.{ Attributed, ManagedLogger }
 private[sbt] abstract class BackgroundJob {
   def humanReadableName: String
   def awaitTermination(): Unit
+
+  /** This waits till the job ends, and returns inner error via `Try`. */
+  def awaitTerminationTry(): Try[Unit] = {
+    // This implementation is provided only for backward compatibility.
+    Try(awaitTermination())
+  }
+
   def shutdown(): Unit
   // this should be true on construction and stay true until
   // the job is complete
@@ -132,15 +140,27 @@ private[sbt] abstract class AbstractBackgroundJobService extends BackgroundJobSe
 
   private def withHandle(job: JobHandle)(f: ThreadJobHandle => Unit): Unit = job match {
     case handle: ThreadJobHandle @unchecked => f(handle)
-    case dead: DeadHandle @unchecked        => () // nothing to stop or wait for
+    case _: DeadHandle @unchecked           => () // nothing to stop or wait for
     case other =>
       sys.error(
         s"BackgroundJobHandle does not originate with the current BackgroundJobService: $other")
   }
 
+  private def withHandleTry(job: JobHandle)(f: ThreadJobHandle => Try[Unit]): Try[Unit] =
+    job match {
+      case handle: ThreadJobHandle @unchecked => f(handle)
+      case _: DeadHandle @unchecked           => Try(()) // nothing to stop or wait for
+      case other =>
+        Try(sys.error(
+          s"BackgroundJobHandle does not originate with the current BackgroundJobService: $other"))
+    }
+
   override def stop(job: JobHandle): Unit =
     withHandle(job)(_.job.shutdown())
 
+  override def waitForTry(job: JobHandle): Try[Unit] =
+    withHandleTry(job)(_.job.awaitTerminationTry())
+
   override def waitFor(job: JobHandle): Unit =
     withHandle(job)(_.job.awaitTermination())
 
@@ -212,6 +232,9 @@ private[sbt] class BackgroundThreadPool extends java.io.Closeable {
     @volatile
     private var status: Status = Waiting
 
+    // This is used to capture exceptions that are caught in this background job.
+    private var exitTry: Option[Try[Unit]] = None
+
     // double-finally for extra paranoia that we will finishedLatch.countDown
     override def run() =
       try {
@@ -226,7 +249,11 @@ private[sbt] class BackgroundThreadPool extends java.io.Closeable {
               throw new RuntimeException("Impossible status of bg thread")
           }
         }
-        try { if (go) body() } finally cleanup()
+        try {
+          if (go) {
+            exitTry = Option(Try(body()))
+          }
+        } finally cleanup()
       } finally finishedLatch.countDown()
 
     private class StopListener(val callback: () => Unit, val executionContext: ExecutionContext)
@@ -269,6 +296,12 @@ private[sbt] class BackgroundThreadPool extends java.io.Closeable {
         result
       }
     override def awaitTermination(): Unit = finishedLatch.await()
+
+    override def awaitTerminationTry(): Try[Unit] = {
+      awaitTermination()
+      exitTry.getOrElse(Try(()))
+    }
+
     override def humanReadableName: String = taskName
     override def isRunning(): Boolean =
       status match {
diff --git a/notes/0.13.17/addSbtPlugin-cross.markdown b/notes/0.13.17/addSbtPlugin-cross.markdown
new file mode 100644
index 000000000..aba7194a4
--- /dev/null
+++ b/notes/0.13.17/addSbtPlugin-cross.markdown
@@ -0,0 +1,7 @@
+### Bug fixes
+
+- Fixes `addSbtPlugin` to use the correct version of sbt. [#3393][]/[#3397][] by [@dwijnand][]
+
+  [#3393]: https://github.com/sbt/sbt/issues/3393
+  [#3397]: https://github.com/sbt/sbt/pull/3397
+  [@dwijnand]: http://github.com/dwijnand
diff --git a/notes/1.0.1.markdown b/notes/1.0.1.markdown
new file mode 100644
index 000000000..63735dfac
--- /dev/null
+++ b/notes/1.0.1.markdown
@@ -0,0 +1,49 @@
+This is a hotfix release for sbt 1.0.x series.
+
+### Improvements
+
+- Various improves around watch source feature. See below.
+
+### Bug fixes
+
+- Fixes command support for cross building `+` command. The `+` added to sbt 1.0 traveres over the subprojects, respecting `crossScalaVersions`; however, it no longer accepted commands as arguments. This brings back the support for it. [#3446][3446] by [@jroper][@jroper]
+- Fixes `addSbtPlugin` to use the correct version of sbt during cross building. [#3442][3442] by [@dwijnand][@dwijnand]
+- Fixes `run in Compile` task not including `Runtime` configuration, by reimplementing `run` in terms of `bgRun`. [#3477][3477] by [@eed3si9n][@eed3si9n]
+- Shows `actual` as a potential option of `inspect` [#3335][3335] by [@Duhemm][@Duhemm]
+- Includes base directory to watched sources. [#3439][3439] by [@Duhemm][@Duhemm]
+- Adds an attempt to workaround intermittent `NullPointerException` arround logging. [util#121][util121] by [@eed3si9n][@eed3si9n]
+- Reverts a bad forward porting. [#3481][3481] by [@eed3si9n][@eed3si9n]
+
+### WatchSource
+
+The watch source feature went through a major change from sbt 0.13 to sbt 1.0 using NIO; however, it did not have clear migration path, so we are rectifying that in sbt 1.0.1.
+
+First, `sbt.WatchSource` is a new alias for `sbt.internal.io.Source`. Hopefully this is easy enough to remember because the key is named `watchSources`. Next, `def apply(base: File)` and `def apply(base: File, includeFilter: FileFilter, excludeFilter: FileFilter)` constructors were added to the companion object of `sbt.WatchSource`.
+
+For backward compatiblity, sbt 1.0.1 adds `+=` support (`Append` instance) from `File` to `Seq[WatchSource]`.
+
+So, if you have a directory you want to watch:
+
+    watchSources += WatchSource(sourceDirectory.value)
+
+If you have a list of files:
+
+    watchSources ++= (sourceDirectory.value ** "*.scala").get
+
+[#3438][3438] by [@Duhemm][@Duhemm]; [#3478][3478] and [io#74][io74] by [@eed3si9n][@eed3si9n]
+
+  [3335]: https://github.com/sbt/sbt/pull/3335
+  [3438]: https://github.com/sbt/sbt/pull/3438
+  [3478]: https://github.com/sbt/sbt/pull/3478
+  [3439]: https://github.com/sbt/sbt/pull/3439
+  [io74]: https://github.com/sbt/io/pull/74
+  [3442]: https://github.com/sbt/sbt/pull/3442
+  [3446]: https://github.com/sbt/sbt/pull/3446
+  [3477]: https://github.com/sbt/sbt/pull/3477
+  [3481]: https://github.com/sbt/sbt/pull/3481
+  [util121]: https://github.com/sbt/util/pull/121
+  [@eed3si9n]: https://github.com/eed3si9n
+  [@dwijnand]: http://github.com/dwijnand
+  [@jvican]: https://github.com/jvican
+  [@Duhemm]: https://github.com/Duhemm
+  [@jroper]: https://github.com/jroper
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 08fca951f..571b6b9be 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -12,8 +12,8 @@ object Dependencies {
   val baseScalaVersion = scala212
 
   // sbt modules
-  private val ioVersion = "1.0.0"
-  private val utilVersion = "1.0.0"
+  private val ioVersion = "1.0.1"
+  private val utilVersion = "1.0.1"
   private val lmVersion = "1.0.0"
   private val zincVersion = "1.0.0"
 
diff --git a/project/build.properties b/project/build.properties
index 12c38d389..94005e587 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.0.0-RC3
+sbt.version=1.0.0
diff --git a/sbt/src/main/scala/Import.scala b/sbt/src/main/scala/Import.scala
index 896271f17..b3ab3b9e1 100644
--- a/sbt/src/main/scala/Import.scala
+++ b/sbt/src/main/scala/Import.scala
@@ -50,6 +50,8 @@ trait Import {
   type RichFile = sbt.io.RichFile
   type SimpleFileFilter = sbt.io.SimpleFileFilter
   type SimpleFilter = sbt.io.SimpleFilter
+  type WatchSource = sbt.internal.io.Source
+  val WatchSource = sbt.internal.io.Source
 
   // sbt.util
   type AbstractLogger = sbt.util.AbstractLogger
diff --git a/sbt/src/sbt-test/actions/cross-multiproject/build.sbt b/sbt/src/sbt-test/actions/cross-multiproject/build.sbt
index 4d434aabd..117efa724 100644
--- a/sbt/src/sbt-test/actions/cross-multiproject/build.sbt
+++ b/sbt/src/sbt-test/actions/cross-multiproject/build.sbt
@@ -19,3 +19,5 @@ lazy val fooPlugin =(project in file("sbt-foo")).
     scalaVersion := "2.12.1",
     crossScalaVersions := Seq("2.12.1")
   )
+
+addCommandAlias("build", "compile")
diff --git a/sbt/src/sbt-test/actions/cross-multiproject/test b/sbt/src/sbt-test/actions/cross-multiproject/test
index ea4079cf0..154e71c2c 100644
--- a/sbt/src/sbt-test/actions/cross-multiproject/test
+++ b/sbt/src/sbt-test/actions/cross-multiproject/test
@@ -36,3 +36,13 @@ $ exists lib/target/scala-2.11
 # -$ exists lib/target/scala-2.12
 # -$ exists sbt-foo/target/scala-2.12
 # $ exists sbt-foo/target/scala-2.11
+
+> clean
+# Test legacy cross build with command support
+> + build
+
+# Uses the root project scala version config, which is only configured to build for Scala 2.12
+$ exists lib/target/scala-2.12
+-$ exists lib/target/scala-2.11
+$ exists sbt-foo/target/scala-2.12
+-$ exists sbt-foo/target/scala-2.11
diff --git a/sbt/src/sbt-test/compiler-project/run-test/build.sbt b/sbt/src/sbt-test/compiler-project/run-test/build.sbt
index 52cd6d1f6..1e2352020 100644
--- a/sbt/src/sbt-test/compiler-project/run-test/build.sbt
+++ b/sbt/src/sbt-test/compiler-project/run-test/build.sbt
@@ -1,6 +1,9 @@
+scalaVersion in ThisBuild := "2.12.3"
+
 libraryDependencies ++= Seq(
-	"com.novocode" % "junit-interface" % "0.5" % "test",
-	"junit" % "junit" % "4.8" % "test"
+	"com.novocode" % "junit-interface" % "0.5" % Test,
+	"junit" % "junit" % "4.8" % Test,
+  "commons-io" % "commons-io" % "2.5" % Runtime,
 )
 
 libraryDependencies += scalaVersion("org.scala-lang" % "scala-compiler" % _ ).value
diff --git a/sbt/src/sbt-test/compiler-project/run-test/src/main/scala/Foo.scala b/sbt/src/sbt-test/compiler-project/run-test/src/main/scala/Foo.scala
index 872ab523e..4f45a02cc 100644
--- a/sbt/src/sbt-test/compiler-project/run-test/src/main/scala/Foo.scala
+++ b/sbt/src/sbt-test/compiler-project/run-test/src/main/scala/Foo.scala
@@ -28,10 +28,11 @@ class Foo {
 		catch { case _: URISyntaxException => new File(url.getPath) }
 }
 
-object Test
-{
-	def main(args: Array[String])
-	{
+object Test {
+	def main(args: Array[String]): Unit = {
+		// test that Runtime configuration is included
+		Class.forName("org.apache.commons.io.ByteOrderMark")
+		
 		val foo = new Foo
 		args.foreach { arg =>  foo.eval(arg) == arg.toInt }
 	}
diff --git a/sbt/src/sbt-test/project/cross-plugins-defaults/build.sbt b/sbt/src/sbt-test/project/cross-plugins-defaults/build.sbt
index 8bd47a1e2..b1d361b5a 100644
--- a/sbt/src/sbt-test/project/cross-plugins-defaults/build.sbt
+++ b/sbt/src/sbt-test/project/cross-plugins-defaults/build.sbt
@@ -4,39 +4,38 @@ val buildCrossList = List("2.10.6", "2.11.11", "2.12.2")
 scalaVersion in ThisBuild := "2.12.2"
 crossScalaVersions in ThisBuild := buildCrossList
 
+addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.7.0")
+
 lazy val root = (project in file("."))
   .settings(
     sbtPlugin := true,
 
-    TaskKey[Unit]("check") := {
-      val crossV = (sbtVersion in pluginCrossBuild).value
-      val sv = projectID.value.extraAttributes("e:scalaVersion")
-      assert(sbtVersion.value startsWith baseSbt, s"Wrong sbt version: ${sbtVersion.value}")
-      assert(sv == "2.12", s"Wrong e:scalaVersion: $sv")
-      assert(scalaBinaryVersion.value == "2.12", s"Wrong Scala binary version: ${scalaBinaryVersion.value}")
-      assert(crossV startsWith "1.0.", s"Wrong `sbtVersion in pluginCrossBuild`: $crossV")
-
-      // crossScalaVersions in app should not be affected
-      val appCrossScalaVersions = (crossScalaVersions in app).value.toList
-      val appScalaVersion = (scalaVersion in app).value
-      assert(appCrossScalaVersions == buildCrossList, s"Wrong `crossScalaVersions in app`: $appCrossScalaVersions")
-      assert(appScalaVersion startsWith "2.12", s"Wrong `scalaVersion in app`: $appScalaVersion")
-    },
-
-    TaskKey[Unit]("check2") := {
-      val crossV = (sbtVersion in pluginCrossBuild).value
-      val sv = projectID.value.extraAttributes("e:scalaVersion")
-      assert(sbtVersion.value startsWith baseSbt, s"Wrong sbt version: ${sbtVersion.value}")
-      assert(sv == "2.10", s"Wrong e:scalaVersion: $sv")
-      assert(scalaBinaryVersion.value == "2.10", s"Wrong Scala binary version: ${scalaBinaryVersion.value}")
-      assert(crossV startsWith "0.13", s"Wrong `sbtVersion in pluginCrossBuild`: $crossV")
-
-      // ^^ should not affect app's crossScalaVersions
-      val appCrossScalaVersions = (crossScalaVersions in app).value.toList
-      val appScalaVersion = (scalaVersion in app).value
-      assert(appCrossScalaVersions == buildCrossList, s"Wrong `crossScalaVersions in app`: $appCrossScalaVersions")
-      assert(appScalaVersion startsWith "2.12", s"Wrong `scalaVersion in app`: $appScalaVersion")
-    }
+    TaskKey[Unit]("check") := mkCheck("2.12", "1.0").value,
+    TaskKey[Unit]("check2") := mkCheck("2.10", "0.13").value
   )
 
 lazy val app = (project in file("app"))
+
+def mkCheck(scalaBinV: String, sbtBinVer: String) = Def task {
+  val crossV = (sbtVersion in pluginCrossBuild).value
+  val crossBinV = (sbtBinaryVersion in pluginCrossBuild).value
+  val sv = projectID.value.extraAttributes("e:scalaVersion")
+  assert(sbtVersion.value startsWith baseSbt, s"Wrong sbt version: ${sbtVersion.value}")
+  assert(sv == scalaBinV, s"Wrong e:scalaVersion: $sv")
+  assert(scalaBinaryVersion.value == scalaBinV, s"Wrong Scala binary version: ${scalaBinaryVersion.value}")
+  assert(crossV startsWith sbtBinVer, s"Wrong `sbtVersion in pluginCrossBuild`: $crossV")
+
+  val ur = update.value
+  val cr = ur.configuration(Compile).get
+  val mr = cr.modules.find(mr => mr.module.organization == "com.eed3si9n" && mr.module.name == "sbt-buildinfo").get
+  val plugSv = mr.module.extraAttributes("scalaVersion")
+  val plugSbtV = mr.module.extraAttributes("sbtVersion")
+  assert(plugSv == scalaBinV, s"Wrong plugin scalaVersion: $plugSv")
+  assert(plugSbtV == sbtBinVer, s"Wrong plugin scalaVersion: $sbtBinVer")
+
+  // crossScalaVersions in app should not be affected, per se or after ^^
+  val appCrossScalaVersions = (crossScalaVersions in app).value.toList
+  val appScalaVersion = (scalaVersion in app).value
+  assert(appCrossScalaVersions == buildCrossList, s"Wrong `crossScalaVersions in app`: $appCrossScalaVersions")
+  assert(appScalaVersion startsWith "2.12", s"Wrong `scalaVersion in app`: $appScalaVersion")
+}
diff --git a/sbt/src/sbt-test/project/flatten/build.sbt b/sbt/src/sbt-test/project/flatten/build.sbt
index 819170f8e..bbe93fbcc 100644
--- a/sbt/src/sbt-test/project/flatten/build.sbt
+++ b/sbt/src/sbt-test/project/flatten/build.sbt
@@ -17,7 +17,10 @@ def unpackageSettings(name: String) = Seq(
   unmanagedSourceDirectories := (baseDirectory.value / name) :: Nil,
   excludeFilter in unmanagedResources := (includeFilter in unmanagedSources).value,
   unmanagedResourceDirectories := unmanagedSourceDirectories.value,
-  unpackage := IO.unzip(artifactPath in packageSrc value, baseDirectory.value / name)
+  unpackage := {
+    IO.unzip(artifactPath in packageSrc value, baseDirectory.value / name)
+    IO.delete(baseDirectory.value / name / "META-INF")
+  }
 )
 
 val unpackage = TaskKey[Unit]("unpackage")