JMeter Vaadin

Hello All!

I am trying to test my webapplication for performance and scalability. Just like vaadin has done with the fictive tickets website. The only problem is that vaadin keeps throwing out of sync errors. I used a tutorial i found on the wiki of vaadin. Anybody here having the same issue or knows how to fix it?

Thanks in advance

PS, when i record and i add a a listener to the proxy all goes well and i can see every response in the lsitener. But when i copy all what i recorded it fails…