I do not know if this is a bug or if it is already documented somewhere 
(I could not find this info when I searched):

I just ran into a problem where session data worked fine in my local dev 
environment, but failed when I deployed to the App Engine.

In the AppEngine logs I found a Runtime error 
"java.io.NotSerializableException". Seems that my Objects needed to 
implement java.io.Serializable.

Just thought I would pass that along in case you ran into the same 
issue. It was not obvious (to me) as the log entries were only 
level.warning.

Steve B.


Jason (Google) wrote:
> To use sessions, you first have to enable them: 
> http://code.google.com/appengine/docs/java/config/appconfig.html#Enabling_Sessions
> 
> Once sessions are enabled, you work with them the same way you work with 
> sessions in other J2EE environments.
> 
> - Jason
> 
> On Wed, Sep 9, 2009 at 4:18 AM, zahid <zhdis...@gmail.com 
> <mailto:zhdis...@gmail.com>> wrote:
> 
> 
>     Dear sir
>     currently we are making an application host on GAE . So i have proble
>     to mentain session give me any example of this
>     best regard
>     zahid
> 
> 
> 
> > 


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