I was really surprised, but here is result of my investigation:

https://github.com/vaadin/gwt-polymer-elements/issues/82

Basically official GWT release 2.7.0 does not have JsFunction annotation. 
Thus it can't work with Vaadin Polymer.
I have to clone GWT project sources and re-compile master to be able to use 
Polymer elements.

Vadim.

On Thursday, December 10, 2015 at 6:50:57 PM UTC+2, [email protected] wrote:
>
> Hello all,
>
>         I have followed GWT tutorial to build TodoList polymer example and 
> during runtime got the following error:
>
>  [ERROR] Errors in 'com/vaadin/polymer/elemental/Function.java'
> [INFO]                [ERROR] Line 6: JsFunction cannot be resolved to a 
> type
> [INFO]                [ERROR] Line 3: The import 
> com.google.gwt.core.client.js.JsFunction cannot be resolved
> [INFO]          [ERROR] Hint: Your source appears not to live underneath a 
> subpackage called 'client'; no problem, but you'll need to use the <source> 
> directive in your module to make it accessible
>
>        I have done everything like tutorial said, but is not able to 
> resolve the issue by myself. JsInterop mode is enabled. I have no idea 
> where to look into...  
>
> P.S. GWT version is 2.7.0, vaadin-gwt-polymer-elements is 1.2.1.0
>
> Thank you.
>

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