Require JDK 17+

.github/workflows/ci.yaml

@@ -200,11 +200,11 @@ jobs:
          )"
 
     steps:
-      ######################################################################################
-      ## WARNING: DO NOT CHANGE THE JAVA VERSION HERE. SCALA IS DISTRIBUTED USING JAVA 8. ##
-      ######################################################################################
-      - name: Set JDK 8 as default
-        run: echo "/usr/lib/jvm/java-8-openjdk-amd64/bin" >> $GITHUB_PATH
+      ##############################################################################################
+      ## WARNING: DO NOT CHANGE THE JAVA VERSION HERE. SCALA 3.8.0+ IS DISTRIBUTED USING JAVA 17. ##
+      ##############################################################################################
+      - name: Set JDK 17 as default
+        run: echo "/usr/lib/jvm/java-17-openjdk-amd64/bin" >> $GITHUB_PATH
       - name: Reset existing repo
         run: |
           git config --global --add safe.directory $GITHUB_WORKSPACE
@@ -257,11 +257,11 @@ jobs:
          )"
 
     steps:
-      ######################################################################################
-      ## WARNING: DO NOT CHANGE THE JAVA VERSION HERE. SCALA IS DISTRIBUTED USING JAVA 8. ##
-      ######################################################################################
-      - name: Set JDK 8 as default
-        run: echo "/usr/lib/jvm/java-8-openjdk-amd64/bin" >> $GITHUB_PATH
+      ##############################################################################################
+      ## WARNING: DO NOT CHANGE THE JAVA VERSION HERE. SCALA 3.8.0+ IS DISTRIBUTED USING JAVA 17. ##
+      ##############################################################################################
+      - name: Set JDK 17 as default
+        run: echo "/usr/lib/jvm/java-17-openjdk-amd64/bin" >> $GITHUB_PATH
       - name: Reset existing repo
         run: |
           git config --global --add safe.directory $GITHUB_WORKSPACE
@@ -314,11 +314,11 @@ jobs:
          )"
 
     steps:
-      ######################################################################################
-      ## WARNING: DO NOT CHANGE THE JAVA VERSION HERE. SCALA IS DISTRIBUTED USING JAVA 8. ##
-      ######################################################################################
-      - name: Set JDK 8 as default
-        run: echo "/usr/lib/jvm/java-8-openjdk-amd64/bin" >> $GITHUB_PATH
+      ##############################################################################################
+      ## WARNING: DO NOT CHANGE THE JAVA VERSION HERE. SCALA 3.8.0+ IS DISTRIBUTED USING JAVA 17. ##
+      ##############################################################################################
+      - name: Set JDK 17 as default
+        run: echo "/usr/lib/jvm/java-17-openjdk-amd64/bin" >> $GITHUB_PATH
       - name: Reset existing repo
         run: |
           git config --global --add safe.directory $GITHUB_WORKSPACE
@@ -415,11 +415,11 @@ jobs:
       SONATYPE_USER: ${{ secrets.SONATYPE_USER_ORGSCALALANG }}
 
     steps:
-      ######################################################################################
-      ## WARNING: DO NOT CHANGE THE JAVA VERSION HERE. SCALA IS DISTRIBUTED USING JAVA 8. ##
-      ######################################################################################
-      - name: Set JDK 8 as default
-        run: echo "/usr/lib/jvm/java-8-openjdk-amd64/bin" >> $GITHUB_PATH
+      ##############################################################################################
+      ## WARNING: DO NOT CHANGE THE JAVA VERSION HERE. SCALA 3.8.0+ IS DISTRIBUTED USING JAVA 17. ##
+      ##############################################################################################
+      - name: Set JDK 17 as default
+        run: echo "/usr/lib/jvm/java-17-openjdk-amd64/bin" >> $GITHUB_PATH
       - name: Reset existing repo
         run: |
           git config --global --add safe.directory $GITHUB_WORKSPACE

community-build/src/scala/dotty/communitybuild/projects.scala

@@ -127,6 +127,11 @@ object projects:
       s""";set $project/Compile/doc/sources ++= ($project/Compile/doc/dotty.tools.sbtplugin.DottyPlugin.autoImport.tastyFiles).value ;$project/doc"""
     ).mkString(" ")
 
+  private def removeRelease8(projects: String*): String =
+    projects.map(project =>
+      s"""set $project/Compile/scalacOptions := ($project/Compile/scalacOptions).value.filterNot(opt => opt == "-release" || opt == "8")"""
+    ).mkString("; ")
+
   private def aggregateDoc(in: String)(projects: String*) =
     val tastyFiles =
       (in +: projects).map(p => s"($p/Compile/doc/dotty.tools.sbtplugin.DottyPlugin.autoImport.tastyFiles).value").mkString(" ++ ")
@@ -445,7 +450,10 @@ object projects:
 
   lazy val discipline = SbtCommunityProject(
     project = "discipline",
-    sbtTestCommand = "coreJVM/test;coreJS/test",
+    sbtTestCommand = List(
+      removeRelease8("core.jvm", "core.js"),
+      "coreJVM/test;coreJS/test"
+    ).mkString("; "),
     sbtPublishCommand = "set every credentials := Nil;coreJVM/publishLocal;coreJS/publishLocal",
     scalacOptions = SbtCommunityProject.scalacOptions.filter(_ != "-Wsafe-init"),
   )
@@ -544,7 +552,12 @@ object projects:
 
   lazy val scissLucre = SbtCommunityProject(
     project           = "Lucre",
-    sbtTestCommand    = "adjunctJVM/test;baseJVM/test;confluentJVM/test;coreJVM/test;dataJVM/test;exprJVM/test;geomJVM/test;lucre-bdb/test;testsJVM/test",
+    sbtTestCommand    =
+      val subprojects = List("adjunct.jvm", "base.jvm", "confluent.jvm", "core.jvm", "data.jvm", "expr.jvm", "geom.jvm", "bdb", "tests.jvm")
+      List(
+        subprojects.map(name => s"""set ($name/Compile/compile/scalacOptions) := ($name/Compile/compile/scalacOptions).value.filterNot(opt => opt == "-release" || opt == "8")"""),
+        List("adjunctJVM/test;baseJVM/test;confluentJVM/test;coreJVM/test;dataJVM/test;exprJVM/test;geomJVM/test;lucre-bdb/test;testsJVM/test")
+      ).flatten.mkString("; "),
     extraSbtArgs      = List("-Dde.sciss.lucre.ShortTests=true"),
     sbtPublishCommand = "adjunctJVM/publishLocal;baseJVM/publishLocal;confluentJVM/publishLocal;coreJVM/publishLocal;dataJVM/publishLocal;exprJVM/publishLocal;geomJVM/publishLocal;lucre-bdb/publishLocal",
   )
@@ -615,7 +628,11 @@ object projects:
 
   lazy val fs2 = SbtCommunityProject(
     project = "fs2",
-    sbtTestCommand = "coreJVM/test; coreJS/test",  // io/test requires JDK9+
+    sbtTestCommand =
+      List(
+        removeRelease8("coreJVM", "coreJS"), // io/test currently fails JDK9+
+        "coreJVM/test; coreJS/test;"
+      ).mkString("; "),
     sbtPublishCommand = "coreJVM/publishLocal; coreJS/publishLocal",
     scalacOptions = SbtCommunityProject.scalacOptions.filter(_ != "-Wsafe-init"),
   )

community-build/test/scala/dotty/communitybuild/CommunityBuildTest.scala

@@ -58,7 +58,8 @@ end CommunityBuildTestB
 @Category(Array(classOf[TestCategory]))
 class CommunityBuildTestC:
   @Test def akka = projects.akka.run()
-  @Test def betterfiles = projects.betterfiles.run()
+  // Disabled because `javax.xml.bind` is not available since java 11
+  // @Test def betterfiles = projects.betterfiles.run()
   @Test def cask = projects.cask.run()
   // Temporarily disabled until problem discovered in comments to #9449 is fixed
   // @Test def dottyCpsAsync = projects.dottyCpsAsync.run()
@@ -75,7 +76,8 @@ class CommunityBuildTestC:
   @Test def oslib = projects.oslib.run()
   // @Test def oslibWatch = projects.oslibWatch.run()
   @Test def parboiled2 = projects.parboiled2.run()
-  @Test def playJson = projects.playJson.run()
+  // Disabled because `javax.xml.bind` is not available since java 11
+  // @Test def playJson = projects.playJson.run()
   @Test def pprint = projects.pprint.run()
   //@Test def protoquill = projects.protoquill.run()
   @Test def requests = projects.requests.run()

compiler/src/dotty/tools/dotc/config/ScalaSettingsProperties.scala

@@ -10,15 +10,15 @@ object ScalaSettingsProperties:
   private lazy val minTargetVersion = classfileVersionMap.keysIterator.min
   private lazy val maxTargetVersion = classfileVersionMap.keysIterator.max
 
+  private val minReleaseVersion = 17
+
   def supportedTargetVersions: List[String] =
     (minTargetVersion to maxTargetVersion).toList.map(_.toString)
 
   def supportedReleaseVersions: List[String] =
-    if scala.util.Properties.isJavaAtLeast("9") then
-      val jdkVersion = JDK9Reflectors.runtimeVersionMajor(JDK9Reflectors.runtimeVersion()).intValue()
-      val maxVersion = Math.min(jdkVersion, maxTargetVersion)
-      (minTargetVersion to maxVersion).toList.map(_.toString)
-    else List(minTargetVersion).map(_.toString)
+    val jdkVersion = JDK9Reflectors.runtimeVersionMajor(JDK9Reflectors.runtimeVersion()).intValue()
+    val maxVersion = Math.min(jdkVersion, maxTargetVersion)
+    (minReleaseVersion to maxVersion).toList.map(_.toString)
 
   def supportedScalaReleaseVersions: List[String] =
     ScalaRelease.values.toList.map(_.show)

sbt-test/sbt-dotty/scaladoc-regressions/build.sbt

@@ -6,4 +6,4 @@ lazy val i20476 = project
 
 lazy val i18231 = project
   .in(file("i18231"))
-  .settings(scalacOptions += "-release:8")
+  .settings(scalacOptions += "-release:17")