from the docs:
1.3.2. How it works
 The first time we navigate to the messages.jsp page, whether by a JSF postback 
(faces request) or a direct browser GET request (non-faces request), the page 
will try to resolve the messages context variable. Since this context variable 
is not initialized, Seam will call the factory method findMessages(), which 
performs a query against the database and results in a DataModel being 
outjected. This DataModel provides the row data needed for rendering the 
<h:dataTable>.

hth
ido

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