[google-appengine] Progress Dialog... returning information?

I have an application with a login screen that connects to a server and authenticates. I've looked up numerous tutorials on using Progress Dialogs and Handlers, and they all explain how to run a seperate thread to (in my case) send the REST request and check the response. However, my issue is that

[google-appengine] Java - Equivalent of Python Datastore object parent? Ancestors?

I am recreating my Python server in Java, here is the specific python section I'm stuck on: -- class AddThread(webapp.RequestHandler): def post(self): catKey= db.Key(encoded=self.request.get('catKey')) cats = db.GqlQuery(SELECT * FROM Category WHERE ANCESTOR IS : 1 ORDER BY

[google-appengine] Creating hierarchy with webapp?

I'm trying to create a message board system, and I have broken it down into categories, threads, and posts. I need to make each post be a child of a thread, etc. I read about setting a parent, and doing database queries with 'ANCESTOR', but I can't find good documentation showing the actual code