Friday, October 22, 2010

Session Expired error in Vaadin and Google App Engine

When developing a Vaadin RIA web application on Google App Engine and you get the following error when clicking a button or any UI action:

Session Expired
 
Take note of any unsaved data, and click here to continue.

90% of the time it means your program throws an Exception.

So check the Console for exceptions and fix it.

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