See the Google App Engine standard environment documentation for more detailed instructions.

• Java 8
• Maven (at least 3.5)
• Google Cloud SDK (aka gcloud command line tool)

• Download and initialize the Cloud SDK

gcloud init

• Create an App Engine app within the current Google Cloud Project

gcloud app create

• In the pom.xml, update the App Engine Maven Plugin with your Google Cloud Project Id:

<plugin>
  <groupId>com.google.cloud.tools</groupId>
  <artifactId>appengine-maven-plugin</artifactId>
  <version>2.2.0</version>
  <configuration>
    <projectId>myProjectId</projectId>
    <version>GCLOUD_CONFIG</version>
  </configuration>
</plugin>

Note: GCLOUD_CONFIG is a special version for autogenerating an App Engine version. Change this field to specify a specific version name.

mvn package appengine:run

To use vist: http://localhost:8080/

mvn package appengine:deploy

To use vist: https://YOUR-PROJECT-ID.appspot.com

mvn verify

As you add / modify the source code (src/main/java/...) it's very useful to add unit testing to (src/main/test/...). The following resources are quite useful:

• Junit4
• Mockito
• Truth

For further information, consult the Java App Engine documentation.