Plz tell your jdeveloper version.
and also run your application module and check your query based view object giving result .if it is not showing single record please check your query.
I am using Jdeveloper 18.104.22.168.0 (11g R2), I am also facing the same issue while using jsff and dropped in jspx page. please suggest me what i am missing here? I checked the pagedef and I have all iterators and variables and query related to read only view object.