RequestFactory: Generate history token on the server-side.

[Aidan O'Kelly]

This doesn't seem possible as getHistoryToken() is a method of
RequestFactory, and no corresponding method in RequestFactoryServlet.

Can I do this somehow, (without patching RF source ! ) If not, worth
opening an issue/feature request?

I have some workarounds for my case, but it would be nicer to be able
to do this..

[Thomas Broyer]

If you've reach that point that you need to construct a "history token" on the server side, then you'd probably better build your tokens on your own rather than rely on RequestFactory's getHistoryToken (which to my knowledge was mostly there for the scaffolding of Spring Roo, so that it "just works" out of the box).