英文:
Internal Server Error on Post Request Spring Boot [Java]
问题
抱歉，我无法完成您的请求。
英文:
I am trying to send a post request to add an User object to the list of users (no database).
getUser, getAllUsers Api endpoints are working fine and giving desired results.
When I send a Post request with User, it is always giving 500 Internal Server Error.
I have also printed out the User and data is fine.
Below is my code -
User Entity (User.java) -
public class User {private Integer userId;private String name;private String email;private Account account;
Getters and Setters along with constructors are also there.
My User Service and its implementation -
UserService.java -
@Servicepublic interface UserService {public User getUser(Integer userId);public List<User> getAllUsers();<T> ResponseEntity<T> deleteUser(Integer userId);<T> ResponseEntity<User> addUser(User user);}
UserServiceImpl.java
@Servicepublic class UserServiceImpl implements UserService{List<User> userList = List.of(new User(1311, "Vaibhav Shrivastava", "innomightmail@gmail.com"),new User(1312, "Varun Shrivastava", "varun@gmail.com"),new User(1313, "Rajesh Shrivastava", "rajesh@gmail.com"));@Overridepublic User getUser(Integer id) {// TODO Auto-generated method stubSystem.out.println(this.userList.stream().filter(user -> user.getUserId().equals(id)).findAny().orElse(null));return this.userList.stream().filter(user -> user.getUserId().equals(id)).findAny().orElse(null);}@Overridepublic List<User> getAllUsers() {// TODO Auto-generated method stubreturn userList;}@Overridepublic <T> ResponseEntity<User> addUser(User user) {// TODO Auto-generated method stubuserList.add(user);return new ResponseEntity<User>((User)user, HttpStatus.OK);}
Controller (UserController.java) -
@RestController@RequestMapping("/user")public class UserController {@Autowiredprivate UserService userService;@Autowiredprivate RestTemplate restTemplate;@GetMapping("/{userId}")public User getUser(@PathVariable("userId") Integer userId) {User user = this.userService.getUser(userId);Account account = this.restTemplate.getForObject("http://account-service/account/user/" + user.getUserId(), Account.class);user.setAccount(account);return user;}@GetMapping("/all-users")public List<User> getAllUsers(){return this.userService.getAllUsers();}@PostMapping("/add-user")public ResponseEntity<Object> addUser(@RequestBody User user) {try {User newUser = new User(user.getUserId(), user.getName(), user.getEmail());this.userService.addUser(newUser);return new ResponseEntity<>(user, HttpStatus.CREATED);} catch (Exception e) {User newUser = new User(user.getUserId(), user.getName(), user.getEmail());return new ResponseEntity<>(newUser, HttpStatus.INTERNAL_SERVER_ERROR);}}
getUser and getAllUsers are working fine (dont get confused by account in getUser that is my another microservice)
When I am sending Post request using postman -
{"userId": 1314,"name": "James","email": "james@gmail.com"}
I am getting response -
500 Internal server error and User object which I wanted to check so I printed it out -
{"userId": 1314,"name": "Kavita Shrivastava","email": "kavita@gmail.com","account": null}
I do not know why I am getting Internal server error.
The request should add the new User to the list in UserServiceImpl.
答案1
得分: 2
堆栈跟踪包含您正在寻找的所有信息。 UserServiceImple.addUser 尝试向 userList 添加一个对象。但 userList 是一个不可变列表，所以它引发异常。代码流程到 "catch" 块，然后返回 500，同时返回新创建的对象。
英文:
Stack trace has all the information you are looking for. UserServiceImple.addUser tries to add an object to the userList . but userList is an immutable list. so it throws exception. code flows to "catch" block and it returns 500 with newly created object.
答案2
得分: 1
根据我的看法，这是因为当你使用List.of时，它等同于Collections.unmodifiableList，因此如果尝试修改它，会引发异常，因为它是不可变的。
英文:
In my opinion That's happens because
when U use List.of it equals to
Collections.unmodifiableList so it will throw an exception as Its Immutable.
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