Hello,
We face some random “Communication problem” (see attachement) and application freeze (page became sort of modal white and nothing works anymore) on our server. It seems we are not the only one with this kind of issue, which led to drop Vaadin in some cases:
http://stackoverflow.com/questions/20463579/vaadin-7-good-framework-but-not-for-my-project
https://vaadin.com/forum#!/thread/321653
https://vaadin.com/forum#!/thread/273087
https://vaadin.com/forum/#!/thread/1417168
In our case, the server configuration is quite simple: Apache 2 with ssl and AJP connector to Tomcat 7. We tried with keep-alive OFF. Vaadin version is 7.1.10.
It’s difficult to give more information because it really happens randomly. The only thing is that it’s probably after some idle period (too short for a timeout), and maybe if another application is used and then come back to the Vaadin application.
Any idea / direction to look at to fix this?
