fix: add native image configurations for Spanner classes

[mpeddada1]

No description provided.

[mpeddada1]

First run of CI succeeded. Pulling in changes from main to verify again

[mpeddada1]

Native Image tests still green after pulling in recent changes in main

[mpeddada1]

Checks still passing after merging recent changes from main.

[ansh0l]

LGTM.

@mpeddada1 : Please close the other PRs around native image testing if this is the final one to be merged.

[mpeddada1]

Looks like we're experiencing some failures due to Java 8 compilation issues. Will wait for #1870 to be merged.

[ansh0l]

Closing since native image changes have been released with #1878

[mpeddada1]

Sorry @ansh0l, I'll have to reopen this PR. We were blocked on some Java compatibility issues which was introduces with the most recent version of GraalVM so this PR is yet to be merged.

[suztomo]

samples / compile (8)

It failed:

2022-05-25T13:54:58.6638474Z [INFO] --- maven-compiler-plugin:3.10.1:compile (default-compile) @ google-cloud-spanner ---
2022-05-25T13:54:58.6675784Z [INFO] Changes detected - recompiling the module!
2022-05-25T13:54:58.6684037Z [INFO] Compiling 194 source files to /home/runner/work/java-spanner/java-spanner/google-cloud-spanner/target/classes
2022-05-25T13:54:58.9751742Z [INFO] -------------------------------------------------------------
2022-05-25T13:54:58.9754868Z [ERROR] COMPILATION ERROR : 
2022-05-25T13:54:58.9757245Z [INFO] -------------------------------------------------------------
2022-05-25T13:54:58.9760200Z [ERROR] /home/runner/work/java-spanner/java-spanner/google-cloud-spanner/src/main/java/com/google/cloud/spanner/nativeimage/SpannerFeature.java:[20,38] cannot access org.graalvm.nativeimage.hosted.Feature
2022-05-25T13:54:58.9761016Z   bad class file: /home/runner/.m2/repository/org/graalvm/sdk/graal-sdk/22.1.0/graal-sdk-22.1.0.jar(org/graalvm/nativeimage/hosted/Feature.class)
2022-05-25T13:54:58.9761667Z     class file has wrong version 55.0, should be 52.0
2022-05-25T13:54:58.9763912Z     Please remove or make sure it appears in the correct subdirectory of the classpath.

Checking...

The root cause is that the "samples / compile (8)" first compiles the root project (which now requires JDK 11).

  compile:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        java: [8, 11]
    steps:
    - uses: actions/checkout@v2
    - uses: actions/setup-java@v1
      with:
        java-version: ${{matrix.java}}
    - name: Compile Spanner
      run: mvn clean install
    - name: Compile samples
      run: mvn compile
      working-directory: samples

Kokoro - Test: Integration

The compile "JDK11 and running test JDK8" somehow didn't work. It tries to recompile the google-cloud-spanner module saying "Change detected":

[INFO] --- flatten-maven-plugin:1.2.7:flatten (flatten) @ google-cloud-spanner ---
[INFO] Generating flattened POM of project com.google.cloud:google-cloud-spanner:jar:6.25.2-SNAPSHOT...
[INFO] 
[INFO] --- maven-compiler-plugin:3.10.1:compile (default-compile) @ google-cloud-spanner ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 194 source files to /tmpfs/src/github/java-spanner/google-cloud-spanner/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /tmpfs/src/github/java-spanner/google-cloud-spanner/src/main/java/com/google/cloud/spanner/nativeimage/SpannerFeature.java:[20,38] cannot access org.graalvm.nativeimage.hosted.Feature
  bad class file: /root/.m2/repository/org/graalvm/sdk/graal-sdk/22.1.0/graal-sdk-22.1.0.jar(org/graalvm/nativeimage/hosted/Feature.class)
    class file has wrong version 55.0, should be 52.0

integration-tests-against-emulator / units

The maven command in .github/workflows/integration-tests-against-emulator.yaml needs to be updated.

[generated-files-bot]

Warning: This pull request is touching the following templated files:

• .github/workflows/ci.yaml
• .kokoro/common.sh
• .kokoro/dependencies.sh

[mpeddada1]

All checks are passing after #1890.