The Google Plugin for Eclipse is deprecated and will be removed in January 2018. Migrate to Cloud Tools for Eclipse and/or the GWT Eclipse Plugin as soon as possible to avoid disruption.

Setting your Project ID and Version

Every application deployed to App Engine is identified by a unique project ID and version. The version lets you distinguish between releases of a particular application, all of which can reside on App Engine simultaneously. You can obtain new project IDs from the Google Cloud Console. You can manage the different versions of your application via the App Engine Administration Console.

The project ID and version for a particular App Engine project are defined by the appengine-web.xml file, found in the war/WEB-INF directory. The project ID can be specified when you first create your web application and choose to use the App Engine SDK in the New Web Application Project wizard. You can view and edit the project ID and version after creating your application by right-clicking the project and selecting Google > App Engine Settings....

Click on the My applications... link to view the applications you've already created on App Engine. To see the existing versions of your application, enter its project ID in the Project ID field and click the Existing versions... link.

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Google Plugin for Eclipse