You could also implement it using a ServletFilter. Take a look at the 
mobile web app example from GWT which uses a ServletFilter to authenticate 
users against Google App Engine:

http://code.google.com/p/google-web-toolkit/source/browse/releases/2.4/samples/mobilewebapp/src/main/java/com/google/gwt/sample/gaerequest/server/GaeAuthFilter.java
 

Then simply add the Filter to your web.xml.

-- J.

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