无法打开JPA EntityManager java.lang.NoSuchMethodError

Question

我尝试使用下一个代码将我的用户保存到MySQL数据库中：

queueTstST :: Int -> State (S.Seq Int) (Maybe Int)
queueTstST n = go n Nothing
  where
  go :: Int -> Maybe Int -> State (S.Seq Int) (Maybe Int)
  go n v = 
    if (n > 1)
    then if even n 
      then pushS' (100 + n) >> go (n - 1) Nothing
      else popS' >>= go (n - 1)
    else return v

这是我对UserService的实现：

@RequestMapping(value = "/registration", method = RequestMethod.POST)
    public String registration(@ModelAttribute("userForm") User userForm, BindingResult bindingResult, Model model) {
        userValidator.validate(userForm, bindingResult);

        if (bindingResult.hasErrors()) {
            return "registration";
        }

        userService.save(userForm);

        securityService.autoLogin(userForm.getUsername(),   userForm.getConfirmPassword());

        return "redirect:/welcome";
    }

这是用户实体

@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserRepository userRepository;

@Autowired
private RoleRepository roleRepository;

@Autowired
private BCryptPasswordEncoder bCryptPasswordEncoder;

@Override
public void save(User user) {
    user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
    Set<Role> roles = new HashSet<>();
    roles.add(roleRepository.getOne(1L));
    user.setRoles(roles);
    userRepository.save(user);
}

@Override
public User findByUsername(String username) {
    return userRepository.findByUsername(username);
}
}

使用相应的getter和setter代替......

这是堆栈跟踪，出现在执行时。

@Entity
@Table(name = "users")
public class User {

    @Id
    @Column(name = "user_id")
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name = "username")
    private String username;

    @Column(name = "password")
    private String password;

    @Column(name = "email")
    private String email;

    @Transient
    private String confirmPassword;

    @ManyToMany
    @JoinTable(name = "user_roles", joinColumns = @JoinColumn(name = "user_id"),
            inverseJoinColumns = @JoinColumn(name = "role_id"))
    private Set<Role> roles;
    ...
    ...
    }