[google-appengine] bad runtime process port ['']

When I switched my servlet app to use Spring MVC and Thymeleaf, it started reporting the error below. Anyone have any ideas? ERROR2016-10-21 21:21:36,223 http_runtime.py:396] bad runtime process port [''] WARNING: Null value for containerConfigProperties.get(devappserver.portMappingProvide

[google-appengine] Error deploying to GAE

I am receiving an error when trying to deploy using maven: mvn clean install --> works OK mvn package --> works OK mvn gcloud:deploy -Dgcloud.gcloud_project=hospital-1382 -Dgcloud.version=1 [INFO] Updating service [default]...failed. [INFO] ERROR: (gcloud.preview.app.deploy) Error