I made a new test JSF application to try to recreate the problem, in order to
publish on this forum. Instead, I got to carefully review all the pieces and
in the process solved it.

I needed to add the class (representing a row) as a managed bean in
faces-config.xml with scope of "none":

  <managed-bean>
        <managed-bean-name>item</managed-bean-name>
        <managed-bean-class>whatever.the.class.is.called</managed-bean-class>
        <managed-bean-scope>none</managed-bean-scope>
  </managed-bean>

Without this, you get the "Base is null" error.

Thanks for the responses!

-David-
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