Per this article <https://cloud.google.com/appengine/docs/standard/java/tools/migrating-from-appcfg-to-gcloud>, currently the gcloud command-line tool does not deploy Java applications to production App Engine. So if you use the Cloud SDK to develop in Java on App Engine, you must use the Cloud SDK-based Maven <https://cloud.google.com/appengine/docs/standard/java/quickstart> or Gradle plugins to deploy applications.
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