UserService is meant to be use on server side, not client side.
You could follow my tutorial on how to use GWT client to perform
Google login:
http://h2g2java.blessedgeek.com/2010/05/accessing-google-userservice-from-gwt.html
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Hi there:
I am a beginner of GWT.
The problem I am having is I couldn't get Google account
authentication. I simply added UserService.getCurrentUser() to the
default project trying to return the user name trough RPC call but it
didn't work. I tried upload the project to GAE and the result is the