From: Raymond DeCampo <ray_at_decampo.org>
Date: Mon, 12 Apr 2010 17:16:38 -0400

You need to provide an implementation of javax.faces.model.DataModel that
understands how to interpret your Map as the value to the dataTable.
Alternatively, coerce the Map into an array, List or ResultSet to use one of
the built-in DataModels.