As said what you have done is generally fine in terms of passing data to a new place. I am saying that you have a bug somewhere in your code that results in a blank "logged in as: " widget because when you do placeController.goTo(new UserPlace(username)) then your UserActivity should be created with the same UserPlace instance as constructor parameter and thus you have the username available in your UserActivity. If that does not happen something is generally wrong in your code.
-- Personally I would not store the username in the browser URL as it is data for the current user session. An URL can be shared with other people so it should not contain "personal" information, only navigational information. At work we have a class called UserSession which stores user related data like username, permissions and is used as a singleton.
-- J.
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