private void loadParticipants() {
        DefaultListModel<Anstalld> dlm = (DefaultListModel<Anstalld>) listParticipantsHolder.getModel();
        dlm.clear();
        ArrayList<String> tempal = new ArrayList<>();
        ArrayList<Anstalld> al = new ArrayList<>();

        try {
            String query = "select aid from arbetar_i where sid=" + selectedSpelprojekt;
            tempal = DB.fetchColumn(query);
        } catch (InfException e) {
            e.getMessage();
        }
        //create Anstalld objects of the DB query
        if (tempal != null) {
            for (String st : tempal) {
                al.add(new Anstalld(Integer.parseInt(st)));
            }
            // add back to the listmodel
            for (Anstalld an : al) {
                dlm.addElement(an);
            }
        }
    }