> Our application is new and 100% build and optimized for GAE. 


I realize English may not be your primary language, but you did read the
article your wrote right?

 

"Optimized for GAE" and "Uses Sessions"  are not the same. Also, if you
check stack overflow there are about 1000 posts telling you "DON'T DO IT
MAN" 

Spring MVC adds about 6 seconds to your cold start time. On a good day, on a
bad day it adds 12-15 seconds. Spring JDO ads about this much again.  This
causes you cascading errors when your app gets over run, and GAE has a slow
day at the same time, as your Spin up can be 30 seconds without much effort
and you are already looking at 85MB of instance memory being use before you
have done anything.

Spring should only be used if you are going to run F2 instances. Warm-Up,
and 2 or more idle instances at all times.

 

Are you doing those things?








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