Contact us
Get started
Loading...
Important Notice - Forums is archived

To simplify things and help our users to be more productive, we have archived the current forum and focus our efforts on helping developers on Stack Overflow. You can post new questions on Stack Overflow or join our Discord channel.

Product icon
TUTORIAL

Vaadin lets you build secure, UX-first PWAs entirely in Java.
Free ebook & tutorial.

Calling javascript synchronously by Enver Haase, 2 weeks ago
Recent Posts
Vaadin Forum3. Vaadin 6, 7, 8

Session Expired on google app engine(GAE)

yunfeng lu
1 decade ago Apr 29, 2012 7:56am

I write a small vaadin app and deployed it onto google GAP http://caraccidentonline.appspot.com/, when I pressed one of two combox button, it show

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

but if it run on local host, it' OK, how do I deal with this bug?

Band Loonatikk
1 decade ago Apr 29, 2012 8:46am

Maybe one of the classes you have declared within you application does not implement java.io.Serializable.

Last updated on Apr, 29th 2012
Artur Signell
1 decade ago Apr 30, 2012 9:20am

Sounds like you are not using the GAEApplicationServlet instead of ApplicationServlet. Google App Engine requires some special handling regarding the session and this is implemented in GAEApplicationServlet