Deploy Vaadin on Weblogic 12

Hi, 

I try to run a vaadin application on a weblogic 12 and jdk 8 but, when the page is displayed, I always get a "Session expired" message. 

I saw other topics about that on the vaadin forum but they never got a solution for that or they are not answered at all.

Usually, I work with Tomcat (which works perfectly by the way) but it's the first time I got a problem like that with a new server.

Do you have any clue how to resolve this problem?

PS : the problem also appears when integrating vaadin with jsp pages.

Thank you

I reset my weblogic domain and now it's ok. I don't know what was the problem before...