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Let me give a small example of a datatable nested inside another one: The list on the inner table has returns an object('relative'), but its members('name' in the case) are not displayed. <p:datatable value='#bean.personList' var='person'> <p:column> <p:dataTable value='#{person.familyMembers}' var='relative'> <p:column>#{relative.name}<p:column> </dataTable> </p:column> </p:datatable> So, #{relative.name} is properly rendered by JSF, but name and other properties are not visible for autocomplete via EL.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss