Merge pull request #594 from alexarchambault/enforce-java-8-compat

Enforce published modules to be compatible with Java 8, and use JDK 21 on CI

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
     - uses: coursier/[email protected]
     - uses: coursier/[email protected]
       with:
-        jvm: 8
+        jvm: 21
     - name: Test
       run: ./mill -i '__[${{ matrix.SCALA_VERSION }}].test'
 
@@ -36,7 +36,7 @@ jobs:
     - uses: coursier/[email protected]
     - uses: coursier/[email protected]
       with:
-        jvm: 8
+        jvm: 21
     - name: Check
       run: ./mill -i __.mimaReportBinaryIssues
 
@@ -50,7 +50,7 @@ jobs:
     - uses: coursier/[email protected]
     - uses: coursier/[email protected]
       with:
-        jvm: 8
+        jvm: 21
         apps: scalafmt:3.7.14
     - run: scalafmt --check
 
@@ -64,7 +64,7 @@ jobs:
     - uses: coursier/[email protected]
     - uses: coursier/[email protected]
       with:
-        jvm: 17
+        jvm: 21
     - run: |
         .github/scripts/setup-mkdocs.sh && \
         ./mill -i docs.mkdocsBuild
@@ -80,7 +80,7 @@ jobs:
     - uses: coursier/[email protected]
     - uses: coursier/[email protected]
       with:
-        jvm: 8
+        jvm: 21
     - run: .github/scripts/gpg-setup.sh
       env:
         PGP_SECRET: ${{ secrets.PUBLISH_SECRET_KEY }}
@@ -105,7 +105,7 @@ jobs:
     - uses: coursier/[email protected]
     - uses: coursier/[email protected]
       with:
-        jvm: 17
+        jvm: 21
     - run: |
         .github/scripts/setup-mkdocs.sh && \
         ./mill -i docs.mkdocsGhDeploy

build.sc

@@ -275,7 +275,7 @@ trait CaseAppScalaNativeModule extends ScalaNativeModule {
   def scalaNativeVersion = Versions.scalaNative
 }
 
-trait CaseAppPublishModule extends PublishModule {
+trait CaseAppPublishModule extends PublishModule with ScalaModule {
   import CaseAppPublishModule._
   import mill.scalalib.publish._
   def pomSettings = PomSettings(
@@ -289,6 +289,15 @@ trait CaseAppPublishModule extends PublishModule {
     )
   )
   def publishVersion = T(buildVersion)
+
+  def javacOptions = super.javacOptions() ++ Seq(
+    "--release",
+    "8"
+  )
+  def scalacOptions = super.scalacOptions() ++ Seq(
+    "--release",
+    "8"
+  )
 }
 
 object CaseAppPublishModule {