Spring Boot is built on Servlet 3.1. Older servlet versions can be
used with Spring Boot, but some workarounds are needed. This project
is a library that gives you a start with those. There is a sample that
is running on Google Appengine at http://dsyerboot.appspot.com/. Copy
the web.xml
from the sample to get started with your own project.
To deploy the sample to GAE use mvn appengine:update
(reference docs
are
here.