chore: Drop JDK 8 (#3017)

* chore: Drop JDK 8

* fail fast if not JDK 11 or higher

.github/workflows/check-build-test.yml

@@ -43,32 +43,6 @@ jobs:
       - name: "Code style, compile tests, MiMa. Run locally with: sbt \"verifyCodeStyle; +Test/compile; mimaReportBinaryIssues\""
         run: sbt "verifyCodeStyle; +Test/compile; mimaReportBinaryIssues"
 
-  compile-jdk-8:
-    name: Compile with JDK 8
-    runs-on: ubuntu-22.04
-    env:
-      JAVA_OPTS: -Xms2G -Xmx2G -Xss2M -XX:ReservedCodeCacheSize=256M -Dfile.encoding=UTF-8
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3.1.0
-        with: # https://github.com/olafurpg/setup-scala#faster-checkout-of-big-repos
-          fetch-depth: 100
-
-      - name: Fetch tags
-        run: git fetch --depth=100 origin +refs/tags/*:refs/tags/*
-
-      - name: Set up JDK 8
-        uses: coursier/setup-action@v1.3.0
-        with:
-          jvm: adopt:1.8.0-275
-
-      - name: Cache Coursier cache
-        uses: coursier/cache-action@v6.4.0
-
-      - name: "Compile JDK 8"
-        run: sbt compile
-
   documentation:
     name: ScalaDoc, Documentation with Paradox
     runs-on: ubuntu-22.04
@@ -168,11 +142,11 @@ jobs:
           CONNECTOR: ${{ matrix.connector }}
         run: ./scripts/gh-detect-changes.sh "${CONNECTOR}"
 
-      - name: Set up JDK 8
+      - name: Set up JDK 11
         if: env.execute_build == 'true'
         uses: coursier/setup-action@v1.3.0
         with:
-          jvm: temurin:1.8
+          jvm: temurin:1.11
 
       - name: Cache Coursier cache
         if: env.execute_build == 'true'

.github/workflows/publish.yml

@@ -29,11 +29,10 @@ jobs:
       - name: Cache Coursier cache
         uses: coursier/cache-action@v6.4.0
 
-      # Release must be with JDK 8 because --release 8 flag prevents access to com.sun.nio.file.SensitivityWatchEventModifier
-      - name: Set up JDK 8
+      - name: Set up JDK 11
         uses: coursier/setup-action@v1.3.0
         with:
-          jvm: adopt:1.8.0-275
+          jvm: temurin:1.11.0.17
 
       - name: Publish artifacts for all Scala versions
         env:

build.sbt

@@ -512,3 +512,10 @@ Global / onLoad := (Global / onLoad).value.andThen { s =>
     )
   s
 }
+
+val isJdk11orHigher: Boolean = {
+  val result = VersionNumber(sys.props("java.specification.version")).matchesSemVer(SemanticSelector(">=11"))
+  if (!result)
+    throw new IllegalArgumentException("JDK 11 or higher is required")
+  result
+}

project/Common.scala

@@ -114,9 +114,9 @@ object Common extends AutoPlugin {
           "-Xlint:try",
           "-Xlint:unchecked",
           "-Xlint:varargs"
-          // Release must be with JDK 8 because this flag prevents access to com.sun.nio.file.SensitivityWatchEventModifier
+          // Release must be with JDK 11 because this flag prevents access to com.sun.nio.file.SensitivityWatchEventModifier
           // "--release",
-          // "8"
+          // "11"
         ),
       compile / javacOptions ++= (scalaVersion.value match {
           case Dependencies.Scala213 if insideCI.value && fatalWarnings.value && !Dependencies.CronBuild =>

project/project-info.conf

@@ -3,7 +3,7 @@ project-info {
   labels: "https://github.com/akka/alpakka/labels/p%3A"
   scaladoc: "https://doc.akka.io/api/alpakka/"${project-info.version}"/akka/stream/alpakka/"
   shared-info {
-    jdk-versions: ["Adopt OpenJDK 8", "Adopt OpenJDK 11"]
+    jdk-versions: ["Eclipse Temurin JDK 11", "Eclipse Temurin JDK 17"]
     snapshots: {
       url: "other-docs/snapshots.html"
       text: "Snapshots are available"