If you want to pass an "authentication token" on each request, then the 
RequestTransport is the way to go on the client-side.

Have a look 
http://code.google.com/p/google-web-toolkit/source/browse/tags/2.1.1/samples/expenses/src/main/java/com/google/gwt/sample/gaerequest/
 which 
is used in the Expenses sample.

However, if you want to do your login() call using RequestFactory, then 
you'd of course get rid of the servlet filter and then either add checks in 
each service method requiring authentication (not productive, but easy to 
comprehend) or somehow "filter" the invocations using a 
ServiceLayerDecorator (kind of AOP-like) that report() any unauthorized 
call. You'd probably couple that with a 
com.google.gwt.requestfactory.server.ExceptionHandler and generic error 
management in your Receiver subclasses (in onFailure).

I'm talking from experience: I'd highly recommend doing sign-in outside the 
app and use the approach used by the Expenses sample (though I acknowledge 
there are use-cases for "in app" authentication that people think are worth 
the trouble)

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