Can't speak for the GWT team here, but this could be a reason:

http://forums.sun.com/thread.jspa?threadID=5336733

On Mar 20, 10:43 am, jcb <[email protected]> wrote:
> I am very satisfied with gwt, and I am making a simple gwt app with
> just client side code.
> I  want to separate model and view, so I wanted to use the simple
> Observer/Observable classes of java.util but it is not emulated in GWT
> (cf. references).
> Someone know why these classes are not emulated ?
>
> Of course it's not a big issue I can create similar classes in client
> side, but it seems a pity if we have to invent/copy again the wheel.

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