Vaadin is quite a good framework - the nicest thing about it is that it mimics Swing's idioms over GWT while hiding some of the latter's details (as RPC).
However there are some issues with Vaadin too. I have recently needed both Push and Cookies... It turned out that this is almost impossible due to the fact taht @Push takes over the entire communication hence Cookies are always null...
As a workaround, UI.getPushConfiguration().setPushMode(PushMode.DISABLE) sometimes works... but - there is no clear rule on when it does happen.
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