GoogleCloudPlatform
diff --git a/.kokoro/java11/presubmit.cfg b/.kokoro/java11/presubmit.cfg
@@ -17,5 +17,5 @@
 # Tell the trampoline which build file to use.
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: "github/java-docs-samples/.kokoro/tests/diff_tests.sh"
+    value: "github/java-docs-samples/.kokoro/tests/run_diff_only.sh"
 }
diff --git a/.kokoro/java8/presubmit.cfg b/.kokoro/java8/presubmit.cfg
@@ -17,5 +17,5 @@
 # Tell the trampoline which build file to use.
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: "github/java-docs-samples/.kokoro/tests/diff_tests.sh"
+    value: "github/java-docs-samples/.kokoro/tests/run_diff_only.sh"
 }
diff --git a/.kokoro/tests/diff_tests.sh b/.kokoro/tests/diff_tests.sh
diff --git a/.kokoro/tests/run_diff_only.sh b/.kokoro/tests/run_diff_only.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+# Copyright 2017 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+mydir="${0%/*}"
+"$mydir"/run_tests.sh --only-diff
diff --git a/.kokoro/tests/run_tests.sh b/.kokoro/tests/run_tests.sh
@@ -13,72 +13,118 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# `-e` enables the script to automatically fail when a command fails
+# `-o pipefail` sets the exit code to the rightmost comment to exit with a non-zero
 set -eo pipefail
+# Enables `**` to include files nested inside sub-folders
 shopt -s globstar
-# We spin up some subprocesses. Don't kill them on hangup
-trap '' HUP
-
-# Update gcloud and check version
-gcloud components update --quiet
-echo "********** GCLOUD INFO ***********"
-gcloud -v
-echo "********** MAVEN INFO  ***********"
-mvn -v
-echo "********** GRADLE INFO ***********"
-gradle -v
-
-# Setup required enviormental variables
-export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-acct.json
-export GOOGLE_CLOUD_PROJECT=java-docs-samples-testing
-source ${KOKORO_GFILE_DIR}/aws-secrets.sh
-source ${KOKORO_GFILE_DIR}/storage-hmac-credentials.sh
-source ${KOKORO_GFILE_DIR}/dlp_secrets.txt
-# Activate service account
-gcloud auth activate-service-account\
-    --key-file=$GOOGLE_APPLICATION_CREDENTIALS \
-    --project=$GOOGLE_CLOUD_PROJECT
-
-echo -e "\n******************** TESTING AFFECTED PROJECTS ********************"
+
+# `--debug` can be added make local testing of this script easier
+if [[ $* == *--script-debug* ]]; then
+    SCRIPT_DEBUG="true"
+    JAVA_VERSION="1.8"
+else
+    SCRIPT_DEBUG="false"
+fi
+
+# `--only-changed` will only run tests on projects container changes from the master branch.
+if [[ $* == *--only-diff* ]]; then
+    ONLY_DIFF="true"
+else
+    ONLY_DIFF="false"
+fi
+
+# Verify Java versions have been specified
+if [[ -z ${JAVA_VERSION+x} ]]; then
+    echo -e "'JAVA_VERSION' env var should be a comma delimited list of valid java versions."
+    exit 1
+fi
+
+if [[ "$SCRIPT_DEBUG" != "true" ]]; then
+    # Update `gcloud` and log versioning for debugging.
+    gcloud components update --quiet
+    echo "********** GCLOUD INFO ***********"
+    gcloud -v
+    echo "********** MAVEN INFO  ***********"
+    mvn -v
+    echo "********** GRADLE INFO ***********"
+    gradle -v
+
+    # Setup required env variables
+    export GOOGLE_CLOUD_PROJECT=java-docs-samples-testing
+    export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-acct.json
+    source "${KOKORO_GFILE_DIR}/aws-secrets.sh"
+    source "${KOKORO_GFILE_DIR}/storage-hmac-credentials.sh"
+    source "${KOKORO_GFILE_DIR}/dlp_secrets.txt"
+    # Activate service account
+    gcloud auth activate-service-account \
+        --key-file="$GOOGLE_APPLICATION_CREDENTIALS" \
+        --project="$GOOGLE_CLOUD_PROJECT"
+
+    cd github/java-docs-samples
+fi
+
+echo -e "\n******************** TESTING PROJECTS ********************"
+# Switch to 'fail at end' to allow all tests to complete before exiting.
 set +e
-RESULT=0
-cd github/java-docs-samples
-# For every pom.xml (may break on whitespace)
+# Use RTN to return a non-zero value if the test fails.
+RTN=0
+ROOT=$(pwd)
+# Find all POMs in the repository (may break on whitespace).
 for file in **/pom.xml; do
-    # Navigate to project
+    cd "$ROOT"
+    # Navigate to the project folder.
     file=$(dirname "$file")
-    pushd "$file" > /dev/null
-
-    # Only test leafs to prevent testing twice
-    PARENT=$(grep "<modules>" pom.xml -c)
-
-    # Get the Java version from the pom.xml
-    VERSION=$(grep -oP '(?<=<maven.compiler.target>).*?(?=</maven.compiler.target>)' pom.xml)
-
-    # Check for changes to the current folder
-    if [ "$PARENT" -eq 0 ] && [[ "$JAVA_VERSION" = *"$VERSION"* ]]; then
-        echo "------------------------------------------------------------"
-        echo "- testing $file"
-        echo "------------------------------------------------------------"
-
-        # Run tests and update RESULT if failed
-        mvn -q --batch-mode --fail-at-end clean verify \
-           -Dfile.encoding="UTF-8" \
-           -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn \
-           -Dmaven.test.redirectTestOutputToFile=true \
-           -Dbigtable.projectID="${GOOGLE_CLOUD_PROJECT}" \
-           -Dbigtable.instanceID=instance
-        EXIT=$?
-
-        if [ $EXIT -ne 0 ]; then
-           echo -e "\n Tests failed. \n"
-           RESULT=1
-        else
-           echo -e "\n Tests complete. \n"
+    cd "$file"
+
+    # If $DIFF_ONLY is true, skip projects without changes.
+    if [[ "$ONLY_DIFF" = "true" ]]; then
+        git diff --quiet origin/master.. .
+        CHANGED=$?
+        if [[ "$CHANGED" -eq 0 ]]; then
+          # echo -e "\n Skipping $file: no changes in folder.\n"
+          continue
         fi
     fi
 
-    popd > /dev/null
+    echo "------------------------------------------------------------"
+    echo "- testing $file"
+    echo "------------------------------------------------------------"
+
+    # Fail the tests if no Java version was found.
+    POM_JAVA=$(grep -oP '(?<=<maven.compiler.target>).*?(?=</maven.compiler.target>)' pom.xml)
+    if [[ "$POM_JAVA" = "" ]]; then
+        RTN=1
+        echo -e "\n Testing failed: Unable to determine Java version. Please set in pom:"
+        echo -e "\n<properties>"
+        echo -e "  <maven.compiler.target>1.8</maven.compiler.target>"
+        echo -e "  <maven.compiler.source>1.8</maven.compiler.source>"
+        echo -e "</properties>\n"
+        continue
+    fi
+
+    # Skip tests that don't have the correct Java version.
+    if ! [[ ",$JAVA_VERSION," =~ ",$POM_JAVA," ]]; then
+        echo -e "\n Skipping tests: Java version ($POM_JAVA) not required ($JAVA_VERSION)\n"
+        continue
+    fi
+
+    # Use maven to execute the tests for the project.
+    mvn -q --batch-mode --fail-at-end clean verify \
+       -Dfile.encoding="UTF-8" \
+       -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn \
+       -Dmaven.test.redirectTestOutputToFile=true \
+       -Dbigtable.projectID="${GOOGLE_CLOUD_PROJECT}" \
+       -Dbigtable.instanceID=instance
+    EXIT=$?
+
+    if [[ $EXIT -ne 0 ]]; then
+      RTN=1
+      echo -e "\n Testing failed: Maven returned a non-zero exit code. \n"
+    else
+      echo -e "\n Testing completed.\n"
+    fi
 
 done
 
-exit $RESULT
+exit "$RTN"
diff --git a/appengine-java8/analytics/pom.xml b/appengine-java8/analytics/pom.xml
@@ -27,7 +27,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
   </parent>
 
   <properties>

diff --git a/appengine-java8/appidentity/pom.xml b/appengine-java8/appidentity/pom.xml
@@ -27,7 +27,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
   </parent>
 
   <properties>

diff --git a/appengine-java8/bigquery/pom.xml b/appengine-java8/bigquery/pom.xml
@@ -27,7 +27,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
   </parent>
 
   <properties>

diff --git a/appengine-java8/bigtable/pom.xml b/appengine-java8/bigtable/pom.xml
@@ -30,7 +30,7 @@ limitations under the License.
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
   </parent>
 
   <properties>
@@ -139,7 +139,7 @@ limitations under the License.
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-failsafe-plugin</artifactId>
-        <version>2.20.1</version>
+        <version>3.0.0-M3</version>
         <configuration>
           <systemPropertyVariables>
             <BIGTABLE_PROJECT>${bigtable.projectID}</BIGTABLE_PROJECT>

diff --git a/appengine-java8/cloudsql-postgres/pom.xml b/appengine-java8/cloudsql-postgres/pom.xml
@@ -27,7 +27,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
   </parent>
 
   <!-- [START gae_java8_postgres_properties] -->

diff --git a/appengine-java8/cloudsql/pom.xml b/appengine-java8/cloudsql/pom.xml
@@ -27,7 +27,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
   </parent>
 
   <!-- [START gae_java8_mysql_properties] -->

diff --git a/appengine-java8/datastore-indexes-exploding/pom.xml b/appengine-java8/datastore-indexes-exploding/pom.xml
@@ -27,7 +27,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
   </parent>
 
   <properties>

diff --git a/appengine-java8/datastore-indexes-perfect/pom.xml b/appengine-java8/datastore-indexes-perfect/pom.xml
@@ -27,7 +27,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
   </parent>
 
   <properties>

diff --git a/appengine-java8/datastore-indexes/pom.xml b/appengine-java8/datastore-indexes/pom.xml
@@ -27,7 +27,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.9</version>
+    <version>1.0.11</version>
   </parent>
 
   <properties>

diff --git a/appengine-java8/datastore-schedule-export/pom.xml b/appengine-java8/datastore-schedule-export/pom.xml
@@ -10,7 +10,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.10</version>
+    <version>1.0.11</version>
   </parent>
 
   <properties>