diff --git a/main/src/main/scala/sbt/ScriptedPlugin.scala b/main/src/main/scala/sbt/ScriptedPlugin.scala
index f4822c3fb..35deb1104 100644
--- a/main/src/main/scala/sbt/ScriptedPlugin.scala
+++ b/main/src/main/scala/sbt/ScriptedPlugin.scala
@@ -8,7 +8,6 @@
 package sbt
 
 import java.io.File
-import java.lang.reflect.Method
 
 import sbt.Def._
 import sbt.Keys._
@@ -47,7 +46,7 @@ object ScriptedPlugin extends AutoPlugin {
     val scriptedParallelInstances = settingKey[Int](
       "Configures the number of scripted instances for parallel testing, only used in batch mode."
     )
-    val scriptedRun = taskKey[Method]("")
+    val scriptedRun = taskKey[ScriptedRun]("")
     val scriptedLaunchOpts =
       settingKey[Seq[String]]("options to pass to jvm launching scripted tasks")
     val scriptedDependencies = taskKey[Unit]("")
@@ -114,21 +113,8 @@ object ScriptedPlugin extends AutoPlugin {
       }
     }
 
-  private[sbt] def scriptedRunTask: Initialize[Task[Method]] = Def.taskDyn {
-    val fCls = classOf[File]
-    val bCls = classOf[Boolean]
-    val asCls = classOf[Array[String]]
-    val lfCls = classOf[java.util.List[File]]
-    val iCls = classOf[Int]
-
-    val clazz = scriptedTests.value.getClass
-    val method =
-      if (scriptedBatchExecution.value)
-        clazz.getMethod("runInParallel", fCls, bCls, asCls, fCls, asCls, lfCls, iCls)
-      else
-        clazz.getMethod("run", fCls, bCls, asCls, fCls, asCls, lfCls)
-
-    Def.task(method)
+  private[sbt] def scriptedRunTask: Initialize[Task[ScriptedRun]] = Def.task {
+    ScriptedRun.of(scriptedTests.value, scriptedBatchExecution.value)
   }
 
   private[sbt] final case class ScriptedTestPage(page: Int, total: Int)
@@ -191,21 +177,16 @@ object ScriptedPlugin extends AutoPlugin {
   private[sbt] def scriptedTask: Initialize[InputTask[Unit]] = Def.inputTask {
     val args = scriptedParser(sbtTestDirectory.value).parsed
     Def.unit(scriptedDependencies.value)
-    try {
-      val method = scriptedRun.value
-      val scriptedInstance = scriptedTests.value
-      val dir = sbtTestDirectory.value
-      val log = Boolean box scriptedBufferLog.value
-      val launcher = sbtLauncher.value
-      val opts = scriptedLaunchOpts.value.toArray
-      val empty = new java.util.ArrayList[File]()
-      val instances = Int box scriptedParallelInstances.value
-
-      if (scriptedBatchExecution.value)
-        method.invoke(scriptedInstance, dir, log, args.toArray, launcher, opts, empty, instances)
-      else method.invoke(scriptedInstance, dir, log, args.toArray, launcher, opts, empty)
-      ()
-    } catch { case e: java.lang.reflect.InvocationTargetException => throw e.getCause }
+    scriptedRun.value.run(
+      sbtTestDirectory.value,
+      scriptedBufferLog.value,
+      args,
+      sbtLauncher.value,
+      Fork.javaCommand((scripted / javaHome).value, "java").getAbsolutePath,
+      scriptedLaunchOpts.value,
+      new java.util.ArrayList[File](),
+      scriptedParallelInstances.value
+    )
   }
 
   private[this] def getJars(config: Configuration): Initialize[Task[PathFinder]] = Def.task {
diff --git a/main/src/main/scala/sbt/ScriptedRun.scala b/main/src/main/scala/sbt/ScriptedRun.scala
new file mode 100644
index 000000000..ea7d7054c
--- /dev/null
+++ b/main/src/main/scala/sbt/ScriptedRun.scala
@@ -0,0 +1,179 @@
+/*
+ * sbt
+ * Copyright 2011 - 2018, Lightbend, Inc.
+ * Copyright 2008 - 2010, Mark Harrah
+ * Licensed under Apache License 2.0 (see LICENSE)
+ */
+
+package sbt
+
+import java.io.File
+import java.lang.reflect.Method
+import scala.annotation.unused
+
+sealed trait ScriptedRun {
+  final def run(
+      resourceBaseDirectory: File,
+      bufferLog: Boolean,
+      tests: Seq[String],
+      launcherJar: File,
+      javaCommand: String,
+      launchOpts: Seq[String],
+      prescripted: java.util.List[File],
+      instances: Int,
+  ): Unit = {
+    try {
+      invoke(
+        resourceBaseDirectory,
+        bufferLog,
+        tests.toArray,
+        launcherJar,
+        javaCommand,
+        launchOpts.toArray,
+        prescripted,
+        instances,
+      )
+      ()
+    } catch { case e: java.lang.reflect.InvocationTargetException => throw e.getCause }
+  }
+
+  protected def invoke(
+      resourceBaseDirectory: File,
+      bufferLog: java.lang.Boolean,
+      tests: Array[String],
+      launcherJar: File,
+      javaCommand: String,
+      launchOpts: Array[String],
+      prescripted: java.util.List[File],
+      instances: java.lang.Integer,
+  ): AnyRef
+
+}
+
+object ScriptedRun {
+
+  def of(scriptedTests: AnyRef, batchExecution: Boolean): ScriptedRun = {
+    val fCls = classOf[File]
+    val bCls = classOf[Boolean]
+    val asCls = classOf[Array[String]]
+    val sCls = classOf[String]
+    val lfCls = classOf[java.util.List[File]]
+    val iCls = classOf[Int]
+
+    val clazz = scriptedTests.getClass
+    if (batchExecution)
+      try new RunInParallelV2(
+        scriptedTests,
+        clazz.getMethod("runInParallel", fCls, bCls, asCls, fCls, sCls, asCls, lfCls, iCls)
+      )
+      catch {
+        case _: NoSuchMethodException =>
+          new RunInParallelV1(
+            scriptedTests,
+            clazz.getMethod("runInParallel", fCls, bCls, asCls, fCls, asCls, lfCls, iCls)
+          )
+      }
+    else
+      try new RunV2(
+        scriptedTests,
+        clazz.getMethod("run", fCls, bCls, asCls, fCls, sCls, asCls, lfCls)
+      )
+      catch {
+        case _: NoSuchMethodException =>
+          new RunV1(scriptedTests, clazz.getMethod("run", fCls, bCls, asCls, fCls, asCls, lfCls))
+      }
+  }
+
+  private class RunV1(scriptedTests: AnyRef, run: Method) extends ScriptedRun {
+    override protected def invoke(
+        resourceBaseDirectory: File,
+        bufferLog: java.lang.Boolean,
+        tests: Array[String],
+        launcherJar: File,
+        @unused javaCommand: String,
+        launchOpts: Array[String],
+        prescripted: java.util.List[File],
+        @unused instances: java.lang.Integer,
+    ): AnyRef =
+      run.invoke(
+        scriptedTests,
+        resourceBaseDirectory,
+        bufferLog,
+        tests,
+        launcherJar,
+        launchOpts,
+        prescripted,
+      )
+  }
+
+  private class RunInParallelV1(scriptedTests: AnyRef, runInParallel: Method) extends ScriptedRun {
+    override protected def invoke(
+        resourceBaseDirectory: File,
+        bufferLog: java.lang.Boolean,
+        tests: Array[String],
+        launcherJar: File,
+        @unused javaCommand: String,
+        launchOpts: Array[String],
+        prescripted: java.util.List[File],
+        instances: Integer,
+    ): AnyRef =
+      runInParallel.invoke(
+        scriptedTests,
+        resourceBaseDirectory,
+        bufferLog,
+        tests,
+        launcherJar,
+        launchOpts,
+        prescripted,
+        instances,
+      )
+  }
+
+  private class RunV2(scriptedTests: AnyRef, run: Method) extends ScriptedRun {
+    override protected def invoke(
+        resourceBaseDirectory: File,
+        bufferLog: java.lang.Boolean,
+        tests: Array[String],
+        launcherJar: File,
+        javaCommand: String,
+        launchOpts: Array[String],
+        prescripted: java.util.List[File],
+        @unused instances: java.lang.Integer,
+    ): AnyRef =
+      run.invoke(
+        scriptedTests,
+        resourceBaseDirectory,
+        bufferLog,
+        tests,
+        launcherJar,
+        javaCommand,
+        launchOpts,
+        prescripted,
+      )
+  }
+
+  private class RunInParallelV2(scriptedTests: AnyRef, runInParallel: Method) extends ScriptedRun {
+    override protected def invoke(
+        resourceBaseDirectory: File,
+        bufferLog: java.lang.Boolean,
+        tests: Array[String],
+        launcherJar: File,
+        javaCommand: String,
+        launchOpts: Array[String],
+        prescripted: java.util.List[File],
+        instances: Integer,
+    ): AnyRef =
+      runInParallel.invoke(
+        scriptedTests,
+        resourceBaseDirectory,
+        bufferLog,
+        tests,
+        launcherJar,
+        javaCommand,
+        launchOpts,
+        prescripted,
+        instances,
+      )
+  }
+
+}
diff --git a/notes/1.6.0/configure-scripted-java-home.md b/notes/1.6.0/configure-scripted-java-home.md
new file mode 100644
index 000000000..f2ace91d8
--- /dev/null
+++ b/notes/1.6.0/configure-scripted-java-home.md
@@ -0,0 +1,14 @@
+[@kxbmap]: https://github.com/kxbmap
+
+[#6673]: https://github.com/sbt/sbt/pull/6673
+
+### Improvements
+
+- Make javaHome that forks scripted tests configurable. [#6673][] by [@kxbmap][]
+  - Normally scripted tests are forked using the JVM that is running sbt. If set `scripted / javaHome`, forked using it.
+  - Or use `java++` command before scripted.
+
+### Fixes with compatibility implications
+
+- Change type of `scriptedRun` task key from `TaskKey[java.lang.reflect.Method]` to `TaskKey[sbt.ScriptedRun]`
+  - `sbt.ScriptedRun` is a new interface for hiding substance of scripted invocation.
diff --git a/run/src/main/scala/sbt/Fork.scala b/run/src/main/scala/sbt/Fork.scala
index 9745c28a6..b2cb449d0 100644
--- a/run/src/main/scala/sbt/Fork.scala
+++ b/run/src/main/scala/sbt/Fork.scala
@@ -114,7 +114,7 @@ object Fork {
     (classpathOption, newOptions)
   }
 
-  private def javaCommand(javaHome: Option[File], name: String): File = {
+  private[sbt] def javaCommand(javaHome: Option[File], name: String): File = {
     val home = javaHome.getOrElse(new File(System.getProperty("java.home")))
     new File(new File(home, "bin"), name)
   }
diff --git a/sbt-app/src/sbt-test/project/scripted-java-home/build.sbt b/sbt-app/src/sbt-test/project/scripted-java-home/build.sbt
new file mode 100644
index 000000000..207694da1
--- /dev/null
+++ b/sbt-app/src/sbt-test/project/scripted-java-home/build.sbt
@@ -0,0 +1,23 @@
+lazy val scriptedJavaVersion = settingKey[Long]("")
+
+lazy val root = (project in file("."))
+  .enablePlugins(SbtPlugin)
+  .settings(
+    scriptedJavaVersion := {
+      val versions = discoveredJavaHomes.value
+        .map { case (jv, _) => JavaVersion(jv).numbers }
+        .collect {
+          case Vector(1L, ver, _*) => ver
+          case Vector(ver, _*)     => ver
+        }
+      if (versions.isEmpty) sys.error("No Java versions discovered")
+      else versions.max
+    },
+    commands += Command.command("setJavaVersion") { state =>
+      val extracted = Project.extract(state)
+      import extracted._
+      val jv = (currentRef / scriptedJavaVersion).get(structure.data).get
+      s"java++ $jv!" :: state
+    },
+    scriptedLaunchOpts += s"-Dscripted.java.version=${scriptedJavaVersion.value}"
+  )
diff --git a/sbt-app/src/sbt-test/project/scripted-java-home/changes/build.sbt b/sbt-app/src/sbt-test/project/scripted-java-home/changes/build.sbt
new file mode 100644
index 000000000..c72b1c31d
--- /dev/null
+++ b/sbt-app/src/sbt-test/project/scripted-java-home/changes/build.sbt
@@ -0,0 +1,13 @@
+lazy val check = taskKey[Unit]("check")
+
+lazy val root = (project in file("."))
+  .settings(
+    check := {
+      val version = sys.props("java.version").stripPrefix("1.").takeWhile(_.isDigit)
+      val expected = sys.props("scripted.java.version")
+      assert(
+        version == expected,
+        s"Expected Java version is '$expected', but actual is '$version'"
+      )
+    }
+  )
diff --git a/sbt-app/src/sbt-test/project/scripted-java-home/changes/test b/sbt-app/src/sbt-test/project/scripted-java-home/changes/test
new file mode 100644
index 000000000..15675b169
--- /dev/null
+++ b/sbt-app/src/sbt-test/project/scripted-java-home/changes/test
@@ -0,0 +1 @@
+> check
diff --git a/sbt-app/src/sbt-test/project/scripted-java-home/test b/sbt-app/src/sbt-test/project/scripted-java-home/test
new file mode 100644
index 000000000..c41dd3978
--- /dev/null
+++ b/sbt-app/src/sbt-test/project/scripted-java-home/test
@@ -0,0 +1,5 @@
+$ copy-file changes/build.sbt src/sbt-test/group/name/build.sbt
+$ copy-file changes/test src/sbt-test/group/name/test
+
+> setJavaVersion
+> scripted
diff --git a/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/RemoteSbtCreator.scala b/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/RemoteSbtCreator.scala
index 41044871f..b35b6a396 100644
--- a/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/RemoteSbtCreator.scala
+++ b/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/RemoteSbtCreator.scala
@@ -27,14 +27,22 @@ final class LauncherBasedRemoteSbtCreator(
     directory: File,
     launcher: File,
     log: Logger,
-    launchOpts: Seq[String] = Nil,
+    javaCommand: String,
+    launchOpts: Seq[String],
 ) extends RemoteSbtCreator {
-  def newRemote(server: IPC.Server) = {
+  def this(
+      directory: File,
+      launcher: File,
+      log: Logger,
+      launchOpts: Seq[String] = Nil,
+  ) = this(directory, launcher, log, "java", launchOpts)
+
+  def newRemote(server: IPC.Server): Process = {
     val launcherJar = launcher.getAbsolutePath
     val globalBase = "-Dsbt.global.base=" + (new File(directory, "global")).getAbsolutePath
     val scripted = "-Dsbt.scripted=true"
     val args = List("<" + server.port)
-    val cmd = "java" :: launchOpts.toList ::: globalBase :: scripted :: "-jar" :: launcherJar :: args ::: Nil
+    val cmd = javaCommand :: launchOpts.toList ::: globalBase :: scripted :: "-jar" :: launcherJar :: args ::: Nil
     val io = BasicIO(false, log).withInput(_.close())
     val p = Process(cmd, directory) run (io)
     val thread = new Thread() { override def run() = { p.exitValue(); server.close() } }
@@ -46,11 +54,21 @@ final class LauncherBasedRemoteSbtCreator(
 final class RunFromSourceBasedRemoteSbtCreator(
     directory: File,
     log: Logger,
-    launchOpts: Seq[String] = Nil,
+    javaCommand: String,
+    launchOpts: Seq[String],
     scalaVersion: String,
     sbtVersion: String,
     classpath: Seq[File],
 ) extends RemoteSbtCreator {
+  def this(
+      directory: File,
+      log: Logger,
+      launchOpts: Seq[String] = Nil,
+      scalaVersion: String,
+      sbtVersion: String,
+      classpath: Seq[File],
+  ) = this(directory, log, "java", launchOpts, scalaVersion, sbtVersion, classpath)
+
   def newRemote(server: IPC.Server): Process = {
     val globalBase = "-Dsbt.global.base=" + new File(directory, "global").getAbsolutePath
     val scripted = "-Dsbt.scripted=true"
@@ -58,7 +76,7 @@ final class RunFromSourceBasedRemoteSbtCreator(
     val cpString = classpath.mkString(java.io.File.pathSeparator)
     val args =
       List(mainClassName, directory.toString, scalaVersion, sbtVersion, cpString, "<" + server.port)
-    val cmd = "java" :: launchOpts.toList ::: globalBase :: scripted :: "-cp" :: cpString :: args ::: Nil
+    val cmd = javaCommand :: launchOpts.toList ::: globalBase :: scripted :: "-cp" :: cpString :: args ::: Nil
     val io = BasicIO(false, log).withInput(_.close())
     val p = Process(cmd, directory) run (io)
     val thread = new Thread() { override def run() = { p.exitValue(); server.close() } }
diff --git a/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/ScriptedTests.scala b/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/ScriptedTests.scala
index cec073175..5a836b885 100644
--- a/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/ScriptedTests.scala
+++ b/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/ScriptedTests.scala
@@ -26,8 +26,15 @@ import scala.util.control.NonFatal
 final class ScriptedTests(
     resourceBaseDirectory: File,
     bufferLog: Boolean,
+    javaCommand: String,
     launchOpts: Seq[String],
 ) {
+  def this(
+      resourceBaseDirectory: File,
+      bufferLog: Boolean,
+      launchOpts: Seq[String],
+  ) = this(resourceBaseDirectory, bufferLog, "java", launchOpts)
+
   import ScriptedTests.TestRunner
 
   private val testResources = new Resources(resourceBaseDirectory)
@@ -80,11 +87,12 @@ final class ScriptedTests(
     val remoteSbtCreator =
       prop match {
         case LauncherBased(launcherJar) =>
-          new LauncherBasedRemoteSbtCreator(testDir, launcherJar, buffered, launchOpts)
+          new LauncherBasedRemoteSbtCreator(testDir, launcherJar, buffered, javaCommand, launchOpts)
         case RunFromSourceBased(scalaVersion, sbtVersion, classpath) =>
           new RunFromSourceBasedRemoteSbtCreator(
             testDir,
             buffered,
+            javaCommand,
             launchOpts,
             scalaVersion,
             sbtVersion,
@@ -383,6 +391,7 @@ class ScriptedRunner {
       bufferLog,
       tests,
       logger,
+      javaCommand = "java",
       launchOpts,
       prescripted = new java.util.ArrayList[File],
       LauncherBased(launcherJar),
@@ -411,6 +420,36 @@ class ScriptedRunner {
       bufferLog,
       tests,
       logger,
+      javaCommand = "java",
+      launchOpts,
+      prescripted,
+      LauncherBased(launcherJar),
+      Int.MaxValue,
+      parallelExecution = false,
+    )
+  }
+
+  /**
+   * This is the entry point used by SbtPlugin in sbt 2.0.x etc.
+   * Removing this method will break scripted and sbt plugin cross building.
+   * See https://github.com/sbt/sbt/issues/3245
+   */
+  def run(
+      resourceBaseDirectory: File,
+      bufferLog: Boolean,
+      tests: Array[String],
+      launcherJar: File,
+      javaCommand: String,
+      launchOpts: Array[String],
+      prescripted: java.util.List[File],
+  ): Unit = {
+    val logger = TestConsoleLogger()
+    run(
+      resourceBaseDirectory,
+      bufferLog,
+      tests,
+      logger,
+      javaCommand,
       launchOpts,
       prescripted,
       LauncherBased(launcherJar),
@@ -440,6 +479,36 @@ class ScriptedRunner {
       bufferLog,
       tests,
       logger,
+      javaCommand = "java",
+      launchOpts,
+      prescripted,
+      LauncherBased(launcherJar),
+      instance,
+    )
+  }
+
+  /**
+   * This is the entry point used by SbtPlugin in sbt 2.0.x etc.
+   * Removing this method will break scripted and sbt plugin cross building.
+   * See https://github.com/sbt/sbt/issues/3245
+   */
+  def runInParallel(
+      resourceBaseDirectory: File,
+      bufferLog: Boolean,
+      tests: Array[String],
+      launcherJar: File,
+      javaCommand: String,
+      launchOpts: Array[String],
+      prescripted: java.util.List[File],
+      instance: Int,
+  ): Unit = {
+    val logger = TestConsoleLogger()
+    runInParallel(
+      resourceBaseDirectory,
+      bufferLog,
+      tests,
+      logger,
+      javaCommand,
       launchOpts,
       prescripted,
       LauncherBased(launcherJar),
@@ -466,6 +535,7 @@ class ScriptedRunner {
       bufferLog,
       tests,
       logger,
+      javaCommand = "java",
       launchOpts,
       prescripted,
       RunFromSourceBased(scalaVersion, sbtVersion, classpath),
@@ -477,11 +547,24 @@ class ScriptedRunner {
       bufferLog: Boolean,
       tests: Array[String],
       logger: Logger,
+      javaCommand: String,
       launchOpts: Array[String],
       prescripted: java.util.List[File],
       prop: RemoteSbtCreatorProp,
       instances: Int
-  ) = run(baseDir, bufferLog, tests, logger, launchOpts, prescripted, prop, instances, true)
+  ): Unit =
+    run(
+      baseDir,
+      bufferLog,
+      tests,
+      logger,
+      javaCommand,
+      launchOpts,
+      prescripted,
+      prop,
+      instances,
+      parallelExecution = true
+    )
 
   @nowarn
   private[this] def run(
@@ -489,6 +572,7 @@ class ScriptedRunner {
       bufferLog: Boolean,
       tests: Array[String],
       logger: Logger,
+      javaCommand: String,
       launchOpts: Array[String],
       prescripted: java.util.List[File],
       prop: RemoteSbtCreatorProp,
@@ -496,7 +580,7 @@ class ScriptedRunner {
       parallelExecution: Boolean,
   ): Unit = {
     val addTestFile = (f: File) => { prescripted.add(f); () }
-    val runner = new ScriptedTests(baseDir, bufferLog, launchOpts)
+    val runner = new ScriptedTests(baseDir, bufferLog, javaCommand, launchOpts)
     val sbtVersion =
       prop match {
         case LauncherBased(launcherJar) =>