Spring MVC / jquery+bootstrap / controller

$(document).ready(function () {

    $('.nBtn, .table .eBtn').on('click', function (event) {

        event.preventDefault();
        var href = $(this).attr('href');
        var text = $(this).text();

        if (text === 'Edit') {
            $.get(href, function (customer, status) {
                $('.myForm #id').val(customer.id);
                $('.myForm #firstName').val(customer.firstName);
                $('.myForm #lastName').val(customer.lastName);
                $('.myForm #age').val(customer.age);
            });
            $('.myForm #exampleModal').modal();
        } else {
            $('.myForm #id').val('');
            $('.myForm #firstName').val('');
            $('.myForm #lastName').val('');
            $('.myForm #age').val('');
            $('.myForm #exampleModal').modal();
        }
    });

    $('.table .deleteBtn').on('click', function (event) {
        event.preventDefault();
        var href = $(this).attr('href');
        $('#exampleModalLong #delRef').attr('href', href);
        $('#exampleModalLong').modal();
    });
});

@Controller
public class CustomerController {

    private CustomerRepository customerRepository;

    public CustomerController(CustomerRepository customerRepository) {
        this.customerRepository = customerRepository;
    }

    @GetMapping("/test/all-customers")
    public String showPage(Model model, @RequestParam(defaultValue = "0") int page) {
        model.addAttribute("data", customerRepository.findAll(PageRequest.of(page, 10, Sort.unsorted())));
        model.addAttribute("currentPage", page);
        return "index";
    }

    @PostMapping("/save")
    public String save(Customer customer) {
        customerRepository.save(customer);
        return "redirect:/test/all-customers";
    }

    @GetMapping("/test/delete")
    public String deleteCustomer(Long id) {
        customerRepository.deleteById(id);
        return "redirect:/test/all-customers";
    }

    @GetMapping("/test/findOne")
    @ResponseBody
    public Customer findOne(Long id) {
        return customerRepository.findById(id).get();
    }
}

        <a th:href="@{findOne/(id=${customer.id})}" class="btn btn-primary eBtn">Edit</a>
<a th:href="@{delete/(id=${customer.id})}" class="btn btn-danger deleteBtn">Delete</a>

    @GetMapping("/test/all-customers")
    public String showPage(Model model, @RequestParam(defaultValue = "0") int page) {
        model.addAttribute("data", customerRepository.findAll(PageRequest.of(page, 10, Sort.unsorted())));
        model.addAttribute("currentPage", page);
        return "index";
    }