ERROR: (gcloud) Invalid choice: 'preview'.

[g-ericso]

I am getting the following errors after running this command:

mvn gcloud:deploy

[INFO] --- gcloud-maven-plugin:2.0.9.88.v20151125:deploy (default-cli) @ websocketchat ---
[INFO] Creating staging directory in: /Users/xxxx/src/appengine-websocketchat-java/target/appengine-staging
[INFO] Running appcfg --disable_update_check -A notused stage /Users/xxxx/src/appengine-websocketchat-java/target/websocketchat-1.0-SNAPSHOT /Users/xxxx/src/appengine-websocketchat-java/target/appengine-staging
Reading application configuration data...


Beginning interaction for module default...
Success.
Temporary staging for module default directory left in /Users/xxxx/src/appengine-websocketchat-java/target/appengine-staging
[INFO] Running gcloud app deploy...
[INFO] Running python -S /Users/xxxx/google-cloud-sdk/lib/gcloud.py --quiet preview app deploy /Users/xxxx/src/appengine-websocketchat-java/target/appengine-staging/app.yaml
[INFO] ERROR: (gcloud) Invalid choice: 'preview'.
[INFO] Usage: gcloud [optional flags] <group | command>
[INFO]   group may be           app | auth | beta | components | compute | config |
[INFO]                          container | dataflow | dataproc | datastore | debug |
[INFO]                          deployment-manager | dns | iam | ml-engine |
[INFO]                          organizations | projects | service-management |
[INFO]                          source | sql | topic
[INFO]   command may be         docker | feedback | help | info | init | version
[INFO] 
[INFO] For detailed information on this command and its flags, run:
[INFO]   gcloud --help
[ERROR] Error: gcloud app command with exit code : 2
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.112 s
[INFO] Finished at: 2017-03-22T14:01:38-07:00
[INFO] Final Memory: 15M/253M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.google.appengine:gcloud-maven-plugin:2.0.9.88.v20151125:deploy (default-cli) on project websocketchat: Error: gcloud app command exit code is: 2 -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

[shigekims]

I was following this tutorial: https://cloud.google.com/solutions/mobile/mobile-firebase-app-engine-flexible and I ran into the same problem.

I had forgotten to put the .json file into the module root directory. When I moved it there, it fixed it for local deployment, but not for live :\

[afaideen]

me too experienced the same thing. Can't deploy.. BTW it works for local.

[chinthakasajith]

Im following this tutorial.
[https://cloud.google.com/solutions/mobile/mobile-firebase-app-engine-flexible]
Can't deploy to app engine but it works for local,Can anyone know how to fix this ?

[billy1380]

I know this is a little bit late but it works if you update to the latest version of the maven plugin.
The version is 2.0.9.121.v20160815 on 18 March 2018

Edit:
it is pointless though because according to https://cloud.google.com/appengine/docs/flexible/java/migrating websockets are disables on the flexible environment.

Like the standard environment, the flexible environment does not support websockets. If you need to use websockets you can use Compute Engine or Kubernetes Engine.

[ricalo]

According to the GitHub repo, gcloud-maven-plugin is deprecated. You should use appengine-maven-plugin instead and deploy with the following command:

mvn clean package appengine:deploy

The tutorial that @chinthakasajith and @shigekims mention now points to the updated plugin. That should solve the deployment issues, but I agree that you should use a different compute service if you need to use websockets.