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I created an example app using vaadin-archetype-application-example. It creates a root and 4 maven modules. The ui module app runs fine on tomcat 8.0.27. The production module built with -Pproduction starts up fine without any error. But it always presents the "cookie disabled" when I click on login. Since the same firefox was used to access the ui module version without an issue, there might be some issue with the module production built?