chore(bigtable): update bigtable example from java8 to java21

appengine-java21/ee8/bigtable/README.md

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+Bigtable-hello-j21
+=================
+
+<a href="https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/java-docs-samples&page=editor&open_in_editor=appengine-java21/ee8/bigtable/README.md">
+<img alt="Open in Cloud Shell" src ="http://gstatic.com/cloudssh/images/open-btn.png"></a>
+
+Moves the Bigtable Hello World application to Google App Engine Standard for Java 21.
+
+
+* [Java 21](http://www.oracle.com/technetwork/java/javase/downloads/index.html)
+* [Maven](https://maven.apache.org/download.cgi) (at least 3.3.9)
+* [Gradle](https://gradle.org)
+* [Google Cloud CLI](https://cloud.google.com/cli/) (aka gcloud)
+
+Initialize the Google Cloud CLI using:
+
+    gcloud init
+
+    gcloud auth application-default login
+
+Then you need to [Create a Cloud Bigtable Instance](https://cloud.google.com/bigtable/docs/creating-instance)
+
+
+## Using Maven
+
+### Run Locally
+
+    mvn -Dbigtable.projectID=PROJECTID -Dbigtable.instanceID=INSTANCEID appengine:run
+
+### Deploy to App Engine Standard for Java 21
+
+    mvn -Dbigtable.projectID=PROJECTID -Dbigtable.instanceID=INSTANCEID package appengine:deploy
+
+### Run Integration Tests
+
+    mvn -Dbigtable.projectID=PROJECTID -Dbigtable.instanceID=INSTANCEID verify
+
+## Using Gradle
+
+### Run Locally
+
+    gradle -Dbigtable.projectID=PROJECTID -Dbigtable.instanceID=INSTANCEID appengineRun
+
+### Integration Tests & Deploy to App Engine Standard for Java 21
+
+    gradle -Dbigtable.projectID=PROJECTID -Dbigtable.instanceID=INSTANCEID appengineDeploy
+
+As you add / modify the source code (`src/main/java/...`) it's very useful to add
+[unit testing](https://cloud.google.com/appengine/docs/java/tools/localunittesting)
+to (`src/main/test/...`).  The following resources are quite useful:
+
+* [JUnit4](http://junit.org/junit4/)
+* [Mockito](http://mockito.org/)
+* [Truth](http://google.github.io/truth/)
+
+### When done
+
+Cloud Bigtable Instances should be [deleted](https://cloud.google.com/bigtable/docs/deleting-instance)
+when they are no longer being used as they use significant resources.

appengine-java21/ee8/bigtable/build.gradle

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+// Copyright 2017 Google LLC
+//
+//  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.
+// [START gae_java21_bigtable_gradle_file]
+buildscript {      // Configuration for building
+  repositories {
+    jcenter()      // Bintray's repository - a fast Maven Central mirror & more
+    mavenCentral()
+  }
+  dependencies {
+    classpath 'com.google.cloud.tools:appengine-gradle-plugin:2.5.0'
+    classpath 'org.akhikhl.gretty:gretty:+'
+  }
+}
+
+apply plugin: 'java'
+apply plugin: 'war'
+apply plugin: 'org.akhikhl.gretty'  // To get webappcopy
+apply plugin: 'com.google.cloud.tools.appengine'
+
+group = 'com.example.google.cloud.bigtable'
+version = '0.1-SNAPSHOT'
+
+sourceCompatibility = 21
+targetCompatibility = 21
+
+tasks.withType(JavaCompile) {
+	options.encoding = 'UTF-8'
+}
+
+repositories {
+  maven { url "https://oss.sonatype.org/content/repositories/snapshots" }
+  jcenter()
+  mavenCentral()
+}
+
+dependencies {
+    compile group: 'com.google.cloud.bigtable', name: 'bigtable-hbase-1.2', version:'1.0.0-pre3'
+    compile group: 'org.apache.hbase', name: 'hbase-client', version:'2.5.6'
+    compile group: 'io.netty', name: 'netty-tcnative-boringssl-static', version:'2.0.62.Final'
+    compile group: 'jakarta.servlet.jsp.jstl', name: 'jakarta.servlet.jsp.jstl-api', version:'1.2.7'
+
+    providedCompile group: 'jakarta.servlet', name: 'jakarta.servlet-api', version:'4.0.4'
+
+    testCompile group: 'com.google.truth', name: 'truth', version:'1.4.4'
+    testCompile group: 'junit', name: 'junit', version:'4.13.2'
+    testCompile group: 'org.mockito', name: 'mockito-core', version:'4.11.0'
+}
+
+import org.apache.tools.ant.filters.ReplaceTokens
+gretty {
+    contextPath = '/'
+    servletContainer = 'jetty9'
+
+    jvmArgs = [ '-DBIGTABLE_PROJECT=' + System.getProperty("bigtable.projectID"),
+          '-DBIGTABLE_INSTANCE=' + System.getProperty("bigtable.instanceID")]
+
+    webappCopy {
+    // Enable filtering on all xml files in WEB-INF
+    filesMatching "**/WEB-INF/*.xml", { FileCopyDetails fileDetails ->
+      logger.lifecycle 'File filtered: {}', fileDetails.path
+      filter (ReplaceTokens, tokens: [
+        'bigtable.projectID' : System.getProperty("bigtable.projectID"),
+        'bigtable.instanceID': System.getProperty("bigtable.instanceID")
+      ])
+    }
+  }
+}
+
+// Always run unit tests
+appengineDeploy.dependsOn test
+
+// [START gae_java21_bigtable_gradle_model]
+appengine {
+    run {
+
+    }
+  deploy {   // deploy configuration
+    stopPreviousVersion = true  // default - stop the current version
+    promote = true              // default - & make this the current version
+  }
+}
+
+test {
+  useJUnit()
+  testLogging.showStandardStreams = true
+
+  systemProperty 'BIGTABLE_PROJECT', System.getProperty("bigtable.projectID")
+  systemProperty 'BIGTABLE_INSTANCE',System.getProperty("bigtable.instanceID")
+
+  beforeTest { descriptor ->
+     logger.lifecycle("test: " + descriptor + "  Running")
+  }
+
+  onOutput { descriptor, event ->
+     logger.lifecycle("test: " + descriptor + ": " + event.message )
+  }
+  afterTest { descriptor, result ->
+    logger.lifecycle("test: " + descriptor + ": " + result )
+  }
+}
+// [END gae_java21_bigtable_gradle_model]
+// [END gae_java21_bigtable_gradle_file]

appengine-java21/ee8/bigtable/gradle/wrapper/gradle-wrapper.properties

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+#Mon Apr 03 21:11:48 PDT 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip