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App Engine: Qwik Start - Java

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App Engine: Qwik Start - Java

30 分钟 1 积分

GSP068

Google Cloud self-paced labs logo

Overview

App Engine allows developers to focus on doing what they do best, writing code. The App Engine standard environment is based on container instances running on Google's infrastructure. Containers are preconfigured with one of several available runtimes (Java 8, Python 3.7, Go and PHP). Each runtime also includes libraries that support App Engine Standard APIs. For many applications, the standard environment runtimes and libraries might be all you need.

The App Engine standard environment makes it easy to build and deploy an application that runs reliably even under heavy load and with large amounts of data. It includes the following features:

  • Persistent storage with queries, sorting, and transactions.
  • Automatic scaling and load balancing.
  • Asynchronous task queues for performing work outside the scope of a request.
  • Scheduled tasks for triggering events at specified times or regular intervals.
  • Integration with other Google cloud services and APIs.

Applications run in a secure, sandboxed environment, allowing App Engine standard environment to distribute requests across multiple servers, and scaling servers to meet traffic demands. Your application runs within its own secure, reliable environment that is independent of the hardware, operating system, or physical location of the server.

This hands-on lab shows you how to create a small App Engine application that displays a short message.

What you'll do

In this lab you will learn how to:

  • Download starter code from a GitHub repository.
  • Run your application locally from a Cloud Shell session.
  • Deploy your application with Google App Engine.

Setup

Before you click the Start Lab button

Read these instructions. Labs are timed and you cannot pause them. The timer, which starts when you click Start Lab, shows how long Google Cloud resources will be made available to you.

This hands-on lab lets you do the lab activities yourself in a real cloud environment, not in a simulation or demo environment. It does so by giving you new, temporary credentials that you use to sign in and access Google Cloud for the duration of the lab.

To complete this lab, you need:

  • Access to a standard internet browser (Chrome browser recommended).
Note: Use an Incognito or private browser window to run this lab. This prevents any conflicts between your personal account and the Student account, which may cause extra charges incurred to your personal account.
  • Time to complete the lab---remember, once you start, you cannot pause a lab.
Note: If you already have your own personal Google Cloud account or project, do not use it for this lab to avoid extra charges to your account.

How to start your lab and sign in to the Google Cloud Console

  1. Click the Start Lab button. If you need to pay for the lab, a pop-up opens for you to select your payment method. On the left is the Lab Details panel with the following:

    • The Open Google Console button
    • Time remaining
    • The temporary credentials that you must use for this lab
    • Other information, if needed, to step through this lab
  2. Click Open Google Console. The lab spins up resources, and then opens another tab that shows the Sign in page.

    Tip: Arrange the tabs in separate windows, side-by-side.

    Note: If you see the Choose an account dialog, click Use Another Account.
  3. If necessary, copy the Username from the Lab Details panel and paste it into the Sign in dialog. Click Next.

  4. Copy the Password from the Lab Details panel and paste it into the Welcome dialog. Click Next.

    Important: You must use the credentials from the left panel. Do not use your Google Cloud Skills Boost credentials. Note: Using your own Google Cloud account for this lab may incur extra charges.
  5. Click through the subsequent pages:

    • Accept the terms and conditions.
    • Do not add recovery options or two-factor authentication (because this is a temporary account).
    • Do not sign up for free trials.

After a few moments, the Cloud Console opens in this tab.

Note: You can view the menu with a list of Google Cloud Products and Services by clicking the Navigation menu at the top-left. Navigation menu icon

Activate Cloud Shell

Cloud Shell is a virtual machine that is loaded with development tools. It offers a persistent 5GB home directory and runs on the Google Cloud. Cloud Shell provides command-line access to your Google Cloud resources.

  1. Click Activate Cloud Shell Activate Cloud Shell icon at the top of the Google Cloud console.

When you are connected, you are already authenticated, and the project is set to your PROJECT_ID. The output contains a line that declares the PROJECT_ID for this session:

Your Cloud Platform project in this session is set to YOUR_PROJECT_ID

gcloud is the command-line tool for Google Cloud. It comes pre-installed on Cloud Shell and supports tab-completion.

  1. (Optional) You can list the active account name with this command:

gcloud auth list
  1. Click Authorize.

  2. Your output should now look like this:

Output:

ACTIVE: * ACCOUNT: student-01-xxxxxxxxxxxx@qwiklabs.net To set the active account, run: $ gcloud config set account `ACCOUNT`
  1. (Optional) You can list the project ID with this command:

gcloud config list project

Output:

[core] project = <project_ID>

Example output:

[core] project = qwiklabs-gcp-44776a13dea667a6 Note: For full documentation of gcloud, in Google Cloud, refer to the gcloud CLI overview guide.

Task 1. Enable Google App Engine Admin API

The App Engine Admin API enables developers to provision and manage their App Engine Applications.

  1. Expand the navigation menu (Navigation Menu icon) and select APIs & Services > Library.

  2. Type "App Engine Admin API" in the search box.

  3. Click App Engine Admin API.

  4. Click Enable if it isn't already set. Your page should now resemble the following:

The App Engine Admin API dialog box including the Manage button, Try this API button, and API enabled checkmark

Task 2. Download the Hello World app

We've created a simple Hello World app written in Java so you can quickly get a feel for deploying an application to the Google Cloud. Follow these steps to download Hello World to your temporary Google Cloud shell environment.

  1. Open a Cloud Shell session and run the following command to clone the Hello World sample app repository:

git clone https://github.com/GoogleCloudPlatform/java-docs-samples.git

Output:

Cloning into 'getting-started-java'... remote: Enumerating objects: 41, done. remote: Counting objects: 100% (41/41), done. remote: Compressing objects: 100% (27/27), done. remote: Total 7608 (delta 17), reused 23 (delta 14), pack-reused 7567 Receiving objects: 100% (7608/7608), 50.79 MiB | 24.17 MiB/s, done. Resolving deltas: 100% (4166/4166), done.
  1. Then go to the directory that contains the sample code:

cd java-docs-samples/appengine-java8/helloworld

In this folder you will find the src directory that contains a package called com.example.appengine.helloworld that implements a simple HTTP Servlet.

Task 3. Test the application using the development server

To get the development server running, you'll download Maven to manage compiling your app and starting the development server.

  1. Run the following commands to configure your Maven environment:

mvn clean mvn package
  1. Enter the following Maven command to download and install Maven and run the app:

mvn appengine:run

It will take a few minutes for Maven to download and install.

The development server is listening for requests on port 8080 when you see the following last line of output:

[INFO] GCLOUD: INFO: Dev App Server is now running
  1. View the app by clicking the Web preview button > Preview on port 8080:

Your page should resemble the following:

The Hello App Engine -- Java 8! page, which includes the version info and a link to the available servlets

  1. In your terminal window, press Ctrl+C to stop the development server.

Task 4. Deploy your app

  1. Now you'll create an application on an App Engine with the following command:

gcloud app create
  1. When prompted, enter your choice of region. You should receive the following output soon after:
Success! The app is now created. Please use `gcloud app deploy` to deploy your first app.
  1. Open the pom.xml file with the following command:

nano pom.xml
  1. Key down towards the bottom of the page until you find this section:

<version>2.2.0</version> <configuration> <!-- can be set w/ -DprojectId=myProjectId on command line --> <projectId>myProjectId</projectId> <!-- set the GAE version or use "GCLOUD_CONFIG" for an autogenerated GAE version --> <version>GCLOUD_CONFIG</version> </configuration>
  1. Change myProjectId to your Project ID. Ensure this section resembles the following before moving on:

<configuration> <!-- can be set w/ -DprojectId=myProjectId on command line --> <projectId>qwiklabs-gcp-02-47242f3ecbf9</projectId> <!-- set the GAE version or use "GCLOUD_CONFIG" for an autogenerated GAE version --> <version>GCLOUD_CONFIG</version> </configuration>
  1. Now exit nano and save the file with CTRL + X > Y > Enter.

DO NOT use the gcloud app deploy command as stated in the output to deploy your app.

  1. Instead, run the following command to deploy your application:

mvn package appengine:deploy

You should receive the following output:

------------------------------------------------------------------------------- [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 38.848 s [INFO] Finished at: 2019-01-15T17:42:49-08:00 [INFO] ------------------------------------------------------------------------

Task 5. View your application

  1. To launch your browser, enter the following command then click on the link it provides:

gcloud app browse

Example output; your link will be different:

Did not detect your browser. Go to this link to view your app: https://qwiklabs-gcp-5c823ee0b4c7fa19.appspot.com

Your application is deployed and you can read the short message in your browser:

The Hello App Engine -- Java 8! page, which includes the version info and a link to the available servlets

Click Check my progress to verify the objective.

Deploy your app.

Task 6. Test your knowledge

Test your knowledge about Google cloud Platform by taking our quiz. (Please select multiple correct options if necessary.)

Congratulations!

Finish your quest

Continue your quest with Baseline: Deploy & Develop. A quest is a series of related labs that form a learning path. Completing this quest earns you a badge to recognize your achievement. You can make your badge or badges public and link to them in your online resume or social media account. Enroll in this quest and get immediate completion credit. Refer to the Google Cloud Skills Boost catalog for all available quests.

Take your next lab

This lab is also part of a series of labs called Qwik Starts. These labs are designed to give you a little taste of the many features available with Google Cloud. Search for "Qwik Starts" in the lab catalog to find the next lab you'd like to take!

Next steps /learn more

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Manual Last Updated September 3, 2022

Lab Last Tested June 05, 2020

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