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@PostMapping("/transfer/make") String processMakeTransferForm(@Valid Transfer transfer, BindingResult result) { Account fromAccount = transfer.getFromAccount(); Account toAccount = transfer.getToAccount(); LocalDateTime transferDate = LocalDateTime.now(ZoneId.of("Europe/Warsaw")); if (result.hasErrors()) { return "transfer/make"; } transfer.setTransferDate(transferDate); String fromCurrency = fromAccount.getCurrency(); String toCurrency = toAccount.getCurrency(); BigDecimal originalAmount = transfer.getOriginalAmount(); BigDecimal finalAmount = transferService.calculateFinalAmount(originalAmount, fromCurrency, toCurrency); transfer.setFinalAmount(finalAmount); transferService.save(transfer); fromAccount.setBalance(fromAccount.getBalance().subtract(originalAmount)); toAccount.setBalance(toAccount.getBalance().add(finalAmount)); accountService.update(fromAccount); accountService.update(toAccount); return "redirect:/account/list"; }