After some more research and experimentation, I believe that I solved the mystery. So again, on the page
https://cloud.google.com/sdk/gcloud/reference/app/deploy is says that you can deploy Java services to App Engine standard with "gcloud app deploy", and on the page https://cloud.google.com/appengine/docs/standard/java/tools/migrating-from-appcfg-to-gcloud it says that you cannot. On the page https://cloud.google.com/appengine/docs/standard/java/config/appref it says that one of the differences between deploying a Java app with appcfg and with "gcloud app deploy" is that the default for making a jar of the class files was "false" under appcfg, but has changed to "true" when using "gcloud app deploy". There was a reason why the default used to be "false": the jarring of the class files changes the class loading order, in a manner that is likely to break apps that use web frameworks, which is pretty much every app, including mine. So I made "gcloud app deploy" use the former default behavior by adding <staging> <enable-jar-classes>false</enable-jar-classes> </staging> to my appengine-web.xml . And Bingo, deploying my Java app to App Engine Standard with "gcloud app deploy" now works like a charm. I would like to respectfully request to not change the default values of options. Changing default vaules of options is likely to cause a lot of people a lot of pain. On Friday, June 15, 2018 at 9:40:31 AM UTC-6, Thomas Becker wrote: > Thanks for the information. As a suggestion, you may want to correct the > page > > https://cloud.google.com/sdk/gcloud/reference/app/deploy > > On that page, in the example section, it says, To deploy an App Engine > Standard Java service, run: > > > $ gcloud app deploy > <https://cloud.google.com/sdk/gcloud/reference/app/deploy> > ~/my_app/WEB-INF/appengine-web.xml > > > On Friday, June 15, 2018 at 8:14:37 AM UTC-6, Kenworth (Google Cloud > Platform) wrote: >> >> 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. >> >> mvn appengine:deploy >> >> >> >> -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/d17d5a9d-7750-4afe-a9f0-32e1a52bce06%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
