This has been discussed on this forum a lot. As Pete says in section 31.1.2 of 
the doc linked to, if you want to use s:link or s:button inside an iterative 
component then the list that the iterative component uses must be annotated 
with @DataModel.

In your case your "cat" bean will be something like:
  | @DataModel
  | List<Question> questionList = new ArrayList<Question>();
  | but note that this will outject a context variable called "questionList", 
so  your datatable will have to refer to it like:<h:dataTable 
styleClass="dataTable" columnClasses="categoryName" var="question" 
value="#{questionList}"> (note that the value attribute has changed)

Cheers,

Damian


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