$scope.addUser = function () {
        $scope.userData = {
            email: $scope.user.email,
            password: $scope.user.password
        };

        auth.signup($scope.userData, successAuth, function (error) {
            $rootScope.error = error;
        });
    };

myApp.service('auth', function($http){
    return {
        signup: function(data,success, error){
        //API call to save new user
            $http.post('mvc-dispatcher/registration', data).success(success).error(error);
        }
    };
});

@RestController
public class UserController {
    @Autowired
    private UserService userService;

    @Autowired
    private SecurityService securityService;

    @Autowired
    private UserValidator userValidator;

    @RequestMapping(value = "/registration", consumes = "application/json", headers = "content-type=application/x-www-form-urlencoded")
    public void registration(@RequestBody User userBean) {
        User myUser = new User();
        System.out.println("register");
        System.out.println("name: " + userBean.getUsername());
        userService.saveUser(userBean); // how to save user here?
    }
}

//user repository

public interface UserRepository extends JpaRepository<User, Long> {
    User findByUsername(String username);
}