Thread: Fill seatpanel

Hello all.

Im a bit lost and all out of ideas on how to solve my problem:
A lil background:
im filling a ShowPanel with different shows being given in a theatre (connected to DAO classes, that in their turn get values out of a database) , and then when you choose from this you get several dates. Then when you click a date, the seatings appear in the SeatPanel.

I got the first part with the shows and dates. But Im stuck at getting the seatings.
I have a controller class which calls the shows+dates (this happens in one method). But i always get a nullpointerexception for the seatings. (this happens in a different method).

I think i just don't know how to link the chosen show+date with the seatings.
For the moment i have :

public ArrayList<Seats> getSeating() throws SeatingException{
    ArrayList<Place> seating = new ArrayList<Place>();
    PlaceDAO pdao = PlaceDAO.getInstance();
    try{
        for (Show s : show ) {
       ArrayList<Showdate> showdate =  s.getDates();
 
 
    for (Showdate sd : showdate ){
         seating.addAll(pdao.getSeating(sd));
 
    }
    }
}
    catch (SeatingException e) {
        JOptionPane.showMessageDialog(null,  e.getMessage(),"No seatings found",
            JOptionPane.ERROR_MESSAGE);
        e.printStackTrace();
    }
 
    return seating;
  }

The code to get the shows and dates is the following :

public ArrayList<Show> getShows() throws ShowException {
 
    try{   
    ShowDAO sdao = ShowDAO.getInstance();
    show= sdao.getShows();
 
    }
    catch (ShowException e) {
      JOptionPane.showMessageDialog(null,  e.getMessage(),"No shows found",
          JOptionPane.ERROR_MESSAGE);
      e.printStackTrace();
    }
    return show;
  }

So this part works..

The given class PlaceDao has a static getInstance() method and an ArrayList<model.Place> getSeating(model.Showdate showdate) method.

In the next stage i have to try and fill the panel with the seatings, but first i need to be able to call them.

Please help me, i need it.

the NullPointerException points to :
seating.addAll(pdao.getSeating(sd));

but this can't be. The pdao. is definitely filled with values
so why isn't it responding ?

well, you can correct if im wrong. Because i obviously dont fully comprehend :

i believe seating is not null because it's initiated as an arrayList, and the filled with the seating values of a given showdate

some shows don't have showdates, this is true
but i can't look into this information because these are given DAO classes, which i cannot alter


so there has to be a way to get the seatings of the shows that have showdates
but i just don't know how anymore

i've been trying for several days, and i simply do not see it

it might be very obvious, but i do not see it