test java 21

Author: pjfanning

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         scala: [2.11.12, 2.12.18, 2.13.12, 3.3.1]
-        java: [zulu@8, zulu@11, zulu@17]
+        java: [zulu@8, zulu@11, zulu@17, zulu@21]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
@@ -56,6 +56,14 @@ jobs:
           java-version: 17
           cache: sbt
 
+      - name: Setup Java (zulu@21)
+        if: matrix.java == 'zulu@21'
+        uses: actions/setup-java@v3
+        with:
+          distribution: zulu
+          java-version: 21
+          cache: sbt
+
       - name: Check that workflows are up to date
         run: sbt -J-Xmx2G '++ ${{ matrix.scala }}' githubWorkflowCheck
 
@@ -111,6 +119,14 @@ jobs:
           java-version: 17
           cache: sbt
 
+      - name: Setup Java (zulu@21)
+        if: matrix.java == 'zulu@21'
+        uses: actions/setup-java@v3
+        with:
+          distribution: zulu
+          java-version: 21
+          cache: sbt
+
       - name: Download target directories (2.11.12)
         uses: actions/download-artifact@v3
         with:

build.sbt

@@ -140,7 +140,8 @@ Compile / resourceGenerators += Def.task {
 Test / parallelExecution := false
 
 ThisBuild / githubWorkflowSbtCommand := "sbt -J-Xmx2G"
-ThisBuild / githubWorkflowJavaVersions := Seq(JavaSpec(Zulu, "8"), JavaSpec(Zulu, "11"), JavaSpec(Zulu, "17"))
+ThisBuild / githubWorkflowJavaVersions := Seq(JavaSpec(Zulu, "8"), JavaSpec(Zulu, "11"),
+  JavaSpec(Zulu, "17"), JavaSpec(Zulu, "21"))
 ThisBuild / githubWorkflowTargetTags ++= Seq("v*")
 ThisBuild / githubWorkflowPublishTargetBranches := Seq(
   RefPredicate.Equals(Ref.Branch("master")),