InvalidDataAccessapiUsageException：未知实体：UserWithRoles

Question

我正在使用Spring security进行一个Spring Boot项目，当我编辑用户时，我会得到一个InvalidDataAccessApiUsageException和一个TraceBack。以下是完整的信息：

// --------- ADD FRIEND (POST)------------
@PostMapping("/profile/friends/edit")
public String addFriend(@RequestParam long friendId, Model model) {

    User currentUser = (User) SecurityContextHolder.getContext().getAuthentication().getPrincipal(); //1. Get the current user

    User friend = usersRepo.getUserById(friendId);

    System.out.println(currentUser.getFirstName());
    System.out.println(friend.getFirstName());

    if(friend.getFriends() == null){ // if there is no friends list -->

        List<User> newFriends = new ArrayList<>(); // 1. Make a new friends list
        friend.setFriends(newFriends); // 2. give the new friends list to User

    }
    if(currentUser.getFriends() == null){ // if there is no friends list -->

        List<User> newFriends = new ArrayList<>(); // 1. Make a new friends list
        currentUser.setFriends(newFriends); // 2. give the new friends list to User

    }

    // --------- ADD USER TO FRIEND-----------
    currentUser.getFriends().add(friend);

    System.out.println(currentUser.getFriends().get(0).getUsername());

    // --------- ADD FRIEND TO USER------------
    friend.getFriends().add(currentUser);

    System.out.println(friend.getFriends().get(0).getUsername());

    // --------- SAVE TO DB -----------
    usersRepo.save(currentUser); // 3. save the list of users to the current users information
    usersRepo.save(friend); // 3. save the list of users to the current users information

    return "users/showConnections";
}

Answer 1

问题是“SecurityContextHolder.getContext().getAuthentication().getPrincipal（）”不返回用户对象，而是返回UserWithRoles对象。UserWithRoles用于设置currentuser变量。然后代码尝试使用userRepo保存currentuser，但由于userRepo不是User对象，因此崩溃了。这是一个UserWithRoles，不适合用户的空间。

这就是我所做的改变：

User user = (User) SecurityContextHolder.getContext().getAuthentication().getPrincipal(); //1. Get the current user
User currentUser = new User(user);