chore: Java 8 unit test to build code in Java 17 and run tests on Java 8 (#1800) (#336)

* chore: Java 8 unit test to build code in Java 17 and run tests on Java 8 (#1800)

* Our Java projects are configured to produce Java 8-compatible bytecode via https://github.com/googleapis/java-shared-config/blob/main/pom.xml#L848. This unit test change ensures this config is applied correctly.

* This change also switches the JDK distribution of GitHub Actions to temurin from zulu.

* For the repositories that mark "dependencies (8)" and "dependencies (11)" as required, they should point to only "dependencies (17)" via `.github/sync-repo-settings.yaml` and repo's Settings tab.
Source-Link: googleapis/synthtool@cbe0100
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:32851debfefed2b66038e0141f1b5c2103bb59ba80b7475adbc10ef7abab3de7

* dependencies (17)

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: losalex <[email protected]>
Co-authored-by: Tomo Suzuki <[email protected]>

Author: 3 people

.github/.OwlBot.lock.yaml

@@ -13,5 +13,6 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:c33bd13e1eab022b0499a3afbfb4b93ae10cb8ad89d8203a6343a88b1b78400f
-# created: 2023-06-21T18:48:32.287298785Z
+  digest: sha256:32851debfefed2b66038e0141f1b5c2103bb59ba80b7475adbc10ef7abab3de7
+# created: 2023-06-22T15:06:52.039318836Z
+

.github/sync-repo-settings.yaml

@@ -8,8 +8,7 @@ branchProtectionRules:
     requiresCodeOwnerReviews: true
     requiresStrictStatusChecks: false
     requiredStatusCheckContexts:
-      - dependencies (8)
-      - dependencies (11)
+      - dependencies (17)
       - lint
       - clirr
       - units (8)

.github/workflows/ci.yaml

@@ -25,7 +25,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: [8, 11, 17]
+        java: [11, 17]
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-java@v3
@@ -36,6 +36,28 @@ jobs:
     - run: .kokoro/build.sh
       env:
         JOB_TYPE: test
+  units-java8:
+    # Building using Java 17 and run the tests with Java 8 runtime
+    name: "units (8)"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          java-version: 8
+          distribution: zulu
+      - name: "Set jvm system property environment variable for surefire plugin (unit tests)"
+        # Maven surefire plugin (unit tests) allows us to specify JVM to run the tests.
+        # https://maven.apache.org/surefire/maven-surefire-plugin/test-mojo.html#jvm
+        run: echo "SUREFIRE_JVM_OPT=-Djvm=${JAVA_HOME}/bin/java" >> $GITHUB_ENV
+        shell: bash
+      - uses: actions/setup-java@v3
+        with:
+          java-version: 17
+          distribution: zulu
+      - run: .kokoro/build.sh
+        env:
+          JOB_TYPE: test
   windows:
     runs-on: windows-latest
     steps:
@@ -54,7 +76,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [8, 11, 17]
+        java: [17]
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-java@v3

.kokoro/build.sh

@@ -47,7 +47,8 @@ set +e
 
 case ${JOB_TYPE} in
 test)
-    mvn test -B -ntp -Dclirr.skip=true -Denforcer.skip=true
+    echo "SUREFIRE_JVM_OPT: ${SUREFIRE_JVM_OPT}"
+    mvn test -B -ntp -Dclirr.skip=true -Denforcer.skip=true ${SUREFIRE_JVM_OPT}
     RETURN_CODE=$?
     ;;
 lint)