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Add user registration?

How would I go about adding user registration to the todo today website.

So far I have created a signup form and in SecurityConfig allow access to that form. Submitting the /signup form posts to /signup and I get an error.

org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: org/hibernate/bytecode/instrumentation/internal/FieldInterceptionHelper

In the controller, the post method for /signup validates input looks like this

@RequestMapping(value = "/signup", method = RequestMethod.POST)
    public String add(@Valid User user, BindingResult bindingResult, Model model, RedirectAttributes redirectAttributes) {
        if (bindingResult.hasErrors()) {
            return "home/signup";
        String password = user.getPassword();
        String encodedPassword = new BCryptPasswordEncoder(10).encode(password);

                new FlashMessage("You have successfully signed up! You may now login.", "alert-success"));

        return "redirect:/login";

the user service looks like this...

public void save(User user) {

my userDao looks like this...

public interface UserDao extends CrudRepository<User, Long> {
    User findByUsername(String username);
    User save(User user);