Change default java toolchain and build from 8 to 11. Add separate CI for Java 8 builds

Note: Java 8 compatibility is still retained for published maven artifacts. JDK 11 is required to invoke android_local_test.
PiperOrigin-RevId: 731512926

Author: l46kok

.bazelrc

@@ -1,7 +1,7 @@
 common --noenable_bzlmod
 common --enable_workspace
-build --java_runtime_version=remotejdk_8
-build --java_language_version=8
+build --java_runtime_version=remotejdk_11
+build --java_language_version=11
 
 # Hide Java 8 deprecation warnings.
 common --javacopt=-Xlint:-options

.github/workflows/workflow.yml

@@ -35,6 +35,8 @@ jobs:
             repository-cache: true
       - name: Bazel Output Version
         run: bazelisk --version
+      - name: Java 8 Build
+        run: bazel build ... --java_language_version=8 --java_runtime_version=8
       - name: Bazel Test
         # Exclude codelab exercises as they are intentionally made to fail
         run: bazelisk test ... --deleted_packages=//codelab/src/test/codelab --test_output=errors

BUILD.bazel

@@ -96,8 +96,8 @@ default_java_toolchain(
     package_configuration = [
         ":error_prone",
     ],
-    source_version = "8",
-    target_version = "8",
+    source_version = "11",
+    target_version = "11",
 )
 
 # This associates a set of javac flags with a set of packages

publish/publish.sh

@@ -26,6 +26,7 @@
 
 
 ALL_TARGETS=("//publish:cel.publish" "//publish:cel_compiler.publish" "//publish:cel_runtime.publish" "//publish:cel_v1alpha1.publish" "//publish:cel_protobuf.publish")
+JDK8_FLAGS="--java_language_version=8 --java_runtime_version=8"
 
 function publish_maven_remote() {
   maven_repo_url=$1
@@ -41,7 +42,8 @@ function publish_maven_remote() {
           --define gpg_sign=true \
           --define "maven_user=$maven_user" \
           --define "maven_password=$maven_password" \
-          $PUBLISH_TARGET
+          $PUBLISH_TARGET \
+          $JDK8_FLAGS
    done
 
 }
@@ -78,6 +80,6 @@ else
  echo "Pushing to local Maven repository $local_maven_repo"
   for PUBLISH_TARGET in "${ALL_TARGETS[@]}"
   do
-     bazel run --define "maven_repo=file://$local_maven_repo" $PUBLISH_TARGET
+     bazel run --define "maven_repo=file://$local_maven_repo" $PUBLISH_TARGET $JDK8_FLAGS
   done
 fi