seems begin=true (for a nested conversation) is required b/c the @Begin annotated
getPopulateUsers() method is being called twice (after users triggers the
processValueChange() method via a drop-down box.
"Now if you tried to go to this page again while still on a page in a long-running
conversation, Seam would return to you an error like the one in Listing 6-8, stating that
you cannot create a new conversation while in an existing conversation."
--Nusairat book, pg. 170.
So the exception should occur on the 2nd method call to that same @Begin method...
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