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To build:
mvn clean install
To test locally
mvn appengine:devserver
Your application is running at http://localhost:8080
To deploy into the cloud
mvn appengine:update
If you do this the first time you need to authorize yourself; you will be prompted for this.
For more details see Google App Engine Maven Project
When running mvn appengine:update and you get this:
"Either the access code is invalid or the OAuth token is revoked.Details: invalid_grant"
and then nothing, you need to delete
~/.appcfg_oauth2_tokens_java