changes without context

        autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

Author: yoshi-automation

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [8, 11]
+        java: [7, 8, 11]
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-java@v1
@@ -80,4 +80,4 @@ jobs:
     - run: java -version
     - run: .kokoro/build.sh
       env:
-        JOB_TYPE: clirr
+        JOB_TYPE: clirr

.kokoro/nightly/java7.cfg

@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+  key: "TRAMPOLINE_IMAGE"
+  value: "gcr.io/cloud-devrel-kokoro-resources/java7"
+}

.kokoro/presubmit/java7.cfg

@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+  key: "TRAMPOLINE_IMAGE"
+  value: "gcr.io/cloud-devrel-kokoro-resources/java7"
+}

CONTRIBUTING.md

@@ -57,9 +57,12 @@ Code Samples must be bundled in separate Maven modules, and guarded by a
 Maven profile with the name `enable-samples`.
 
 The samples must be separate from the primary project for a few reasons:
-1. Many code samples depend on external GCP services and need
+1. Primary projects have a minimum Java version of Java 7 whereas samples have
+   a minimum Java version of Java 8. Due to this we need the ability to
+   selectively exclude samples from a build run.
+2. Many code samples depend on external GCP services and need
    credentials to access the service.
-2. Code samples are not released as Maven artifacts and must be excluded from
+3. Code samples are not released as Maven artifacts and must be excluded from 
    release builds.
 
 ### Building

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-spanner.git",
-        "sha": "4088981314097647e3ed79f2c748545cac6fc34e"
+        "sha": "6d9c3b884357ddc4d314ebdfac5fc6dda2de3b49"
       }
     },
     {