You are correct, since the App Engine Flexible environment <https://cloud.google.com/appengine/docs/java/> is capable of hosting any runtime via Docker, the Java image offered in the documentation uses the newer Java 8 (just as Les stated).
To reiterate Les' comment, the App Engine Standard Java runtime <https://cloud.google.com/appengine/docs/java/>on the other hand is at Java 7. You can also request to have Java 8 <https://docs.google.com/a/google.com/forms/d/1MDzykTWp77YzRgFs5R6ONOuKWYnKEhfy5VhSJYbDvmo/viewform?edit_requested=true> on the Standard runtime which is currently available during the Alpha signup. -- 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 [email protected]. To post to this group, send email to [email protected]. 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/d6e91522-0969-45ac-8e40-ccfc6b9e7897%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
