Always return null in getAppointmentByRoomId method

Hello I have a one big issue when I am creating one appointment it creates successfully but when I try to fetch it using getAppointmentByRoomId() it always return null, I tried with JSP then I tried with PHP as well to call this method succesfully but everywhere always give no results, In-fact there is data in it and also appear in the Conference rooms also?

So whats is the mistake? I think it's serious Issue