Dto

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);
    }

/with DTO
public AccountDto 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");
        }

        AccountDto accountDto = new AccountDto();
        accountDto.setServiceName(account.getServiceName());
        accountDto.setEmail(account.getEmail());
        accountDto.setPassword(account.getPassword());
        accountDto.setCreatedOn(account.getCreatedOn());
        account.setUpdatedOn(account.getUpdatedOn());

        accountRepository.save(account);
        return accountDto;
}