Ok I found a lot of info on the GWT forums.
Thanks Ieszek so now I know...
The synchronous interface is not available for GWT and is so for a
really good reason... it would block the whole browser!

On Nov 2, 8:42 am, edarroyo <[email protected]> wrote:
> Yes, so that's just not suggested?
>
> On Nov 2, 1:20 am, leszek <[email protected]> wrote:
>
> >http://groups.google.com/group/Google-Web-Toolkit?pli=1
>
> > But what do you want to achieve ?
> > To call :
> > SearchResult res = dataService.searchSomething(...)
>
> > instead of
>
> > dataServiceAsync.searchSomething(... new CallBack()); ?
>
> > Rather impossible, you would block the browser until RPC returns.
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