Program: 147529
Project: 147529
Buggy source:
@RequestMapping(value="String_Node_Str",method=RequestMethod.POST) public String orderBuy(Model model){
  if (order.size() == 0) {
    model.addAttribute("String_Node_Str","String_Node_Str");
    model.addAttribute("String_Node_Str","String_Node_Str");
    return "String_Node_Str";
  }
  model.addAttribute("String_Node_Str","String_Node_Str");
  model.addAttribute("String_Node_Str","String_Node_Str");
  if (order.size() > 0) {
    ArrayList<Ticket> deletingTicket=new ArrayList<>();
    for (    Ticket ord : order) {
      if (ticketService.getTicketById(ord.getId()) == null)       deletingTicket.add(ord);
    }
    if (deletingTicket.size() == 1) {
      model.addAttribute("String_Node_Str","String_Node_Str" + deletingTicket.get(0).getId() + "String_Node_Str");
      order.remove(deletingTicket.get(0));
      orderPrice-=deletingTicket.get(0).getSector().getPrice();
    }
    if (deletingTicket.size() > 1) {
      StringBuilder builder=new StringBuilder(200);
      for (      Ticket tic : deletingTicket) {
        builder.append(tic.getId()).append("String_Node_Str");
        order.remove(tic);
        orderPrice-=tic.getSector().getPrice();
      }
      model.addAttribute("String_Node_Str","String_Node_Str" + builder + "String_Node_Str");
    }
  }
  StringBuilder idBuy=new StringBuilder(200);
  for (  Ticket ticket : order) {
    ticket.setConfirmed(true);
    idBuy.append(ticket.getId()).append("String_Node_Str");
    ticketService.addTicket(ticket);
  }
  if (order.size() == 1)   model.addAttribute("String_Node_Str","String_Node_Str" + idBuy + "String_Node_Str");
  if (order.size() > 1)   model.addAttribute("String_Node_Str","String_Node_Str" + idBuy + "String_Node_Str");
  order.clear();
  orderPrice=0;
  return "String_Node_Str";
}

Fixed version (ground truth):
@RequestMapping(value="String_Node_Str",method=RequestMethod.POST) public String orderBuy(Model model){
  if (order.size() == 0) {
    model.addAttribute("String_Node_Str","String_Node_Str");
    model.addAttribute("String_Node_Str","String_Node_Str");
    return "String_Node_Str";
  }
  model.addAttribute("String_Node_Str","String_Node_Str");
  model.addAttribute("String_Node_Str","String_Node_Str");
  if (order.size() > 0) {
    ArrayList<Ticket> deletingTicket=new ArrayList<>();
    for (    Ticket ord : order) {
      if (ticketService.getTicketById(ord.getId()) == null)       deletingTicket.add(ord);
    }
    if (deletingTicket.size() == 1) {
      model.addAttribute("String_Node_Str","String_Node_Str" + deletingTicket.get(0).getId() + "String_Node_Str");
      order.remove(deletingTicket.get(0));
      orderPrice-=deletingTicket.get(0).getSector().getPrice();
    }
    if (deletingTicket.size() > 1) {
      StringBuilder builder=new StringBuilder(200);
      for (      Ticket tic : deletingTicket) {
        builder.append(tic.getId()).append("String_Node_Str");
        order.remove(tic);
        orderPrice-=tic.getSector().getPrice();
      }
      model.addAttribute("String_Node_Str","String_Node_Str" + builder + "String_Node_Str");
    }
  }
  StringBuilder idBuy=new StringBuilder(200);
  for (  Ticket ticket : order) {
    if (ticketService.getTicketById(ticket.getId()).isConfirmed()) {
      model.addAttribute("String_Node_Str","String_Node_Str" + ticket.getId() + "String_Node_Str");
      order.remove(ticket);
      orderPrice-=ticket.getSector().getPrice();
      return "String_Node_Str";
    }
  }
  for (  Ticket ticket : order) {
    ticket.setConfirmed(true);
    idBuy.append(ticket.getId()).append("String_Node_Str");
    ticketService.addTicket(ticket);
  }
  if (order.size() == 1)   model.addAttribute("String_Node_Str","String_Node_Str" + idBuy + "String_Node_Str");
  if (order.size() > 1)   model.addAttribute("String_Node_Str","String_Node_Str" + idBuy + "String_Node_Str");
  order.clear();
  orderPrice=0;
  return "String_Node_Str";
}