java 11 jdk test

Author: chingor13

.kokoro/build.sh

@@ -94,6 +94,21 @@ case ${JOB_TYPE} in
       install_modules "${BUILD_SUBDIR}"
       echo "Running in subdir: ${BUILD_SUBDIR}"
       pushd "${BUILD_SUBDIR}"
+
+      if [[ "${BUILD_SUBDIR}" == "java-datastore" ]]; then
+        # Kokoro integration tests use both JDK 11 and JDK 8. Integration
+        # tests require JDK 11 export as JAVA env variable to run cloud datastore
+        # emulator (https://cloud.google.com/sdk/docs/release-notes#39300_2022-07-12).
+        # For Java 8 environment, we will still run the tests using Java 8 with
+        # SUREFIRE_JVM_OPT for Maven surefire plugin:
+        # https://maven.apache.org/surefire/maven-surefire-plugin/test-mojo.html#jvm
+        if [[ -n "${JAVA11_HOME}"  &&  -n "${JAVA8_HOME}" ]]
+        then
+          export JAVA=${JAVA11_HOME}/bin/java
+          export SUREFIRE_JVM_OPT=-Djvm=${JAVA8_HOME}/bin/java
+        fi
+      fi
+
       echo "SUREFIRE_JVM_OPT: ${SUREFIRE_JVM_OPT}"
       echo "INTEGRATION_TEST_ARGS: ${INTEGRATION_TEST_ARGS}"
       mvn verify -Penable-integration-tests \