Redo the old java8 samples to AppEngine latsst java21 runtime.

Author: ludoch

appengine-java8/README.md renamed to appengine-java21/README.md

@@ -19,7 +19,7 @@
   <packaging>war</packaging>
   <version>1.0-SNAPSHOT</version>
   <groupId>com.example.appengine</groupId>
-  <artifactId>appengine-analytics-j8</artifactId>
+  <artifactId>appengine-analytics-j21</artifactId>
 
   <!--
     The parent pom defines common style checks and testing strategies for our samples.

appengine-java8/analytics/README.md renamed to appengine-java21/analytics/README.md

@@ -14,9 +14,14 @@
 -->
 <!-- [END_EXCLUDE] -->
 <appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
-  <threadsafe>true</threadsafe>
-  <runtime>java8</runtime>
-  <env-variables>
+
+  <runtime>java21</runtime>
+   <app-engine-apis>true</app-engine-apis>
+  <system-properties>
+    <property name="appengine.use.EE8" value="true"/>
+  </system-properties>
+  
+   <env-variables>
     <env-var name="GA_TRACKING_ID" value="YOUR-GA-TRACKING-ID" />
   </env-variables>
 </appengine-web-app>

appengine-java8/analytics/pom.xml renamed to appengine-java21/analytics/pom.xml

@@ -20,7 +20,7 @@
   <packaging>war</packaging>
   <version>1.0-SNAPSHOT</version>
   <groupId>com.example.appengine</groupId>
-  <artifactId>appengine-appidentity-j8</artifactId>
+  <artifactId>appengine-appidentity-j21</artifactId>
 
   <!--
     The parent pom defines common style checks and testing strategies for our samples.

appengine-java8/analytics/src/main/java/com/example/appengine/analytics/AnalyticsServlet.java renamed to appengine-java21/analytics/src/main/java/com/example/appengine/analytics/AnalyticsServlet.java

@@ -32,6 +32,7 @@
 )
 public class IdentityServlet extends HttpServlet {
 
+  // [START gae_java21_app_identity_versioned_hostnames]
   @Override
   public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
     resp.setContentType("text/plain");
@@ -40,4 +41,5 @@ public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOExc
     resp.getWriter()
         .println(env.getAttributes().get("com.google.appengine.runtime.default_version_hostname"));
   }
+  // [END gae_java21_app_identity_versioned_hostnames]
 }

appengine-java8/analytics/src/main/webapp/WEB-INF/appengine-web.xml renamed to appengine-java21/analytics/src/main/webapp/WEB-INF/appengine-web.xml

@@ -54,7 +54,7 @@ public SignForAppServlet() {
     appIdentity = AppIdentityServiceFactory.getAppIdentityService();
   }
 
-  // [START gae_java8_app_identity_other_services]
+  // [START gae_java21_app_identity_other_services]
   // Note that the algorithm used by AppIdentity.signForApp() and
   // getPublicCertificatesForApp() is "SHA256withRSA"
 
@@ -102,7 +102,7 @@ private String simulateIdentityAssertion()
         "isValid=%b for message: %s\n\tsignature: %s\n\tpublic cert: %s",
         isValid, message, Arrays.toString(blobSignature), Arrays.toString(publicCert));
   }
-  // [END gae_java8_app_identity_other_services]
+  // [END gae_java21_app_identity_other_services]
 
   @Override
   public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {