This is going to be a self-answered question, but I thought that such a specific question (and answer) could be of use to others…
What are the potential issues associated with enabling multi-threading in Google App Engine (GAE/J) using the element in appengine-web.xml?
I have looked at this for a project I’m working on, and I have written up what I have found in an analysis here: http://devcon5.blogspot.com
I would very much appreciate any comments or additional questions I should cover.
Thanks.