Added a cron sample

managed_vms/cron/README.md

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+# App Engine Cron Service sample for Google App Engine
+This sample demonstrates how to deploy App Engine Cron Service to ping a servlet deployed in the app.
+
+## Running locally
+    $ mvn jetty:run
+
+## Deploying app
+    $ mvn gcloud:deploy
+
+## Deploying cron job
+    $ gcloud preview app deploy cron.yaml

managed_vms/cron/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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.managedvms</groupId>
+  <artifactId>managed-vms-cron</artifactId>
+
+  <parent>
+    <artifactId>doc-samples</artifactId>
+    <groupId>com.google.cloud</groupId>
+    <version>1.0.0</version>
+    <relativePath>../..</relativePath>
+  </parent>
+
+  <!-- [START dependencies] -->
+  <dependencies>
+    <dependency>
+      <groupId>javax.servlet</groupId>
+      <artifactId>javax.servlet-api</artifactId>
+      <version>3.1.0</version>
+      <type>jar</type>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+  <!-- [END dependencies] -->
+
+  <build>
+    <!-- for hot reload of the web application -->
+    <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
+    <plugins>
+      <plugin>
+        <groupId>com.google.appengine</groupId>
+        <artifactId>gcloud-maven-plugin</artifactId>
+        <version>2.0.9.101.v20160316</version>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-war-plugin</artifactId>
+        <version>2.6</version>
+        <configuration>
+          <failOnMissingWebXml>false</failOnMissingWebXml>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <version>3.3</version>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.eclipse.jetty</groupId>
+        <artifactId>jetty-maven-plugin</artifactId>
+        <version>9.3.7.v20160115</version>
+      </plugin>
+    </plugins>
+  </build>
+</project>

managed_vms/cron/src/main/appengine/app.yaml

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+runtime: java
+vm: true
+
+handlers:
+- url: /.*
+  script: this field is required, but ignored
+  secure: always

managed_vms/cron/src/main/appengine/cron.yaml

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+cron:
+ - description: sample cron job
+   url: /cron
+   schedule: every 1 mins

managed_vms/cron/src/main/java/com/example/managedvms/cron/CronServlet.java

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+/**
+ * Copyright 2016 Google Inc. All Rights Reserved.
+ *
+ * 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.
+ */
+
+package com.example.managedvms.cron;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+// [START example]
+@WebServlet(name = "cron", value = "/cron")
+@SuppressWarnings("serial")
+public class CronServlet extends HttpServlet {
+
+  @Override
+  public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
+    PrintWriter out = resp.getWriter();
+    out.println("Hello from cron!");
+  }
+}
+// [END example]