//Service
public Account save(Account account) throws Exception {
        if (StringUtils.isEmpty(account.getServiceName())) {
            throw new Exception("Service name is required");
        }
        if (StringUtils.isEmpty(account.getEmail())) {
            throw new Exception("Email is required");
        }

        if (account.getId() != null && existsById(account.getId())) {
            throw new Exception("Account with id: " + account.getId() + " already exists");
        }

        return accountRepository.save(account);
    }


/Controller
@PostMapping(value = "/accounts/add")
    public String addAccount(Model model, @ModelAttribute("account") Account account) {
        try {
            Account newAccount = accountService.save(account);
            return "redirect:/accounts/" + newAccount.getId();
        } catch (Exception e) {
            String errorMessage = e.getMessage();
            logger.error(errorMessage);
            model.addAttribute("errorMessage", errorMessage);
            model.addAttribute("add", true);
            return "account-edit";
        }
    }

//account-edit
<form action="${urlAction}" name="account" method="post">
    <table border="0">
        <#if account.id??>
            <tr>
                <td>ID</td>
                <td>:</td>
                <td>${account.id}</td>
            </tr>
        </#if>
        <tr>
            <td>Service</td>
            <td>:</td>
            <td><label>
                    <input type="text" name="service" value="${(account.serviceName)!''}"/>
                </label></td>
        </tr>