Nie wczytuje linii z pliku tekstowego

BufferedReader br;
        try {
            br = new BufferedReader(new FileReader("Z:/INPUT/" + GetFileName()));
            try {
                String Item;
                while ( (Item = br.readLine()) != null ) {
                    if("HDR".equals(Item.substring(0, 3)))
                    {
                        tempHEADR = Item;
                    } else {
                        ProcessFile(Item, ProductionLines, DeliveryLines, tempHEADR);
                    }
                }
                HEADR = GetHeader();
            } catch (IOException e) {
                DisplayErrorMessage(e.getMessage());
                System.exit(0);
            }
        } catch (FileNotFoundException | StringIndexOutOfBoundsException e) {
            DisplayErrorMessage(e.getMessage());
            out.println(Arrays.toString(e.getStackTrace()));
            System.exit(0);
        }

                while ( (Item = br.readLine()) != null ) {
                    System.out.println(Item.length());
                    if("HDR".equals(Item.substring(0, 3)))
                    {
                        tempHEADR = Item;
                    } else {
                        ProcessFile(Item, ProductionLines, DeliveryLines, tempHEADR);
                    }
                }

String linia = "";
String liniaSub = ""
try {
                    while ((linia = bfr.readLine()) != null) {
                        System.out.println(linia);
                        BufferedWriter out = new BufferedWriter(file);
                        liniaSub = linia.substring(0, 374);
                        out.write(liniaSub + "\n");
                        out.flush();
                    }
                } catch (IOException e) {
                    System.exit(2);
                }

                while ( (Item = br.readLine()) != null ) {
                    if(!Item.isEmpty() && Item.startsWith("HDR"))
                    {
                        tempHEADR = Item;
                    } else {
                        ProcessFile(Item, ProductionLines, DeliveryLines, tempHEADR);
                    }
                }