chore:upgrade java8 to java21 for gaeinfo folder

appengine-java21/gaeinfo/README.md

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+# Google App Engine Information
+
+<a href="https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/java-docs-samples&page=editor&open_in_editor=appengine-java8/gaeinfo/README.md">
+<img alt="Open in Cloud Shell" src ="http://gstatic.com/cloudssh/images/open-btn.png"></a>
+
+This sample displays what's going on in your app. It dumps the environment and lots more.
+
+See the [Google App Engine standard environment documentation][ae-docs] for more
+detailed instructions.
+
+[ae-docs]: https://cloud.google.com/appengine/docs/java/
+
+## Setup
+
+Use either:
+
+* `gcloud init`
+* `gcloud auth application-default login`
+
+## Maven
+### Running locally
+
+    $ mvn appengine:run
+
+### Deploying
+
+    $ mvn clean package appengine:deploy
+
+<!--
+## Intelij Idea
+Limitations - Appengine Standard support in the Intellij plugin is only available for the Ultimate Edition of Idea.
+
+### Install and Set Up Cloud Tools for IntelliJ
+
+To use Cloud Tools for IntelliJ, you must first install IntelliJ IDEA Ultimate edition.
+
+Next, install the plugins from the IntelliJ IDEA Plugin Repository.
+
+To install the plugins:
+
+1. From inside IDEA, open File > Settings (on Mac OS X, open IntelliJ IDEA > Preferences).
+1. In the left-hand pane, select Plugins.
+1. Click Browse repositories.
+1. In the dialog that opens, select Google Cloud Tools.
+1. Click Install.
+1. Click Close.
+1. Click OK in the Settings dialog.
+1. Click Restart (or you can click Postpone, but the plugins will not be available until you do restart IDEA.)
+
+### Running locally
+
+### Deploying
+ -->

appengine-java21/gaeinfo/pom.xml

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+<!--
+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.
+-->
+<!-- [START gae_java21_pom] -->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <packaging>war</packaging>
+  <version>1.0-SNAPSHOT</version>
+  <groupId>com.example.appengine</groupId>
+  <artifactId>gaeinfo-j21</artifactId>
+
+  <!--
+    The parent pom defines common style checks and testing strategies for our samples.
+    Removing or replacing it should not affect the execution of the samples in anyway.
+  -->
+  <parent>
+    <groupId>com.google.cloud.samples</groupId>
+    <artifactId>shared-configuration</artifactId>
+    <version>1.2.0</version>
+  </parent>
+
+   <!-- [START gae_java21_compiler] -->
+  <properties>    <!-- App Engine Standard currently requires Java 21 -->
+    <maven.compiler.target>21</maven.compiler.target>
+    <maven.compiler.source>21</maven.compiler.source>
+  </properties>
+  <!-- [END gae_java21_compiler] -->
+
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <artifactId>libraries-bom</artifactId>
+        <groupId>com.google.cloud</groupId>
+        <scope>import</scope>
+        <type>pom</type>
+        <version>26.28.0</version>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.appengine</groupId>
+      <artifactId>appengine-api-1.0-sdk</artifactId>
+      <version>2.0.23</version>
+    </dependency>
+
+    <dependency>
+      <groupId>javax.servlet</groupId>
+      <artifactId>javax.servlet-api</artifactId>
+      <version>3.1.0</version>
+      <type>jar</type>
+      <scope>provided</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>com.squareup.okhttp3</groupId>
+      <artifactId>okhttp</artifactId>
+      <version>4.12.0</version>
+    </dependency>
+
+    <dependency>
+      <groupId>com.google.code.gson</groupId>
+      <artifactId>gson</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.thymeleaf</groupId>
+      <artifactId>thymeleaf</artifactId>
+      <version>3.1.2.RELEASE</version>
+    </dependency>
+
+  </dependencies>
+
+  <build>
+    <!-- for hot reload of the web application -->
+    <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes
+    </outputDirectory>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-war-plugin</artifactId>
+        <version>3.4.0</version>
+        <configuration>
+          <webResources>
+            <!-- in order to interpolate version from pom into appengine-web.xml -->
+            <resource>
+              <directory>${basedir}/src/main/webapp/WEB-INF</directory>
+              <filtering>true</filtering>
+              <targetPath>WEB-INF</targetPath>
+            </resource>
+          </webResources>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>com.google.cloud.tools</groupId>
+        <artifactId>appengine-maven-plugin</artifactId>
+        <version>2.5.0</version>
+        <configuration>
+          <projectId>GCLOUD_CONFIG</projectId>
+          <version>GCLOUD_CONFIG</version>
+          <deploy.promote>true</deploy.promote>
+          <deploy.stopPreviousVersion>true</deploy.stopPreviousVersion>
+        </configuration>
+      </plugin>
+
+    </plugins>
+  </build>
+</project>
+<!-- [END gae_java21_pom] -->