Facebook canvas page in Java - optional app authorization?

I don't know anything about the details of the Java API, but I can tell you about the two ways to get a user ID. The first, as you know about, is to require the user to authenticate the application. You don't necessarily need to redirect the user anywhere to do this if you're using FBML and put requirelogin="1" on some HTML links or form elements and an in-page "Authorise this app" popup will appear.

Once they've authorised the app you'll get the fb_sig_user parameter passed in each request.

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