前端报错信息 ：
前端代码：
create(user: User): Observable<User> {
return this.http.post(this.resourceUrl, user);
}
后台报错信息：
后台代码;
/**
* POST /users : Creates a new user.
* <p>
* Creates a new user if the login and email are not already used, and sends an
* mail with an activation link.
* The user needs to be activated on creation.
*
* @param userDTO the user to create
* @return the ResponseEntity with status 201 (Created) and with body the new user, or with status 400 (Bad Request) if the login or email is already in use
* @throws URISyntaxException if the Location URI syntax is incorrect
* @throws BadRequestAlertException 400 (Bad Request) if the login or email is already in use
*/
@PostMapping("/users")
@Timed
@Secured(AuthoritiesConstants.ADMIN)
public ResponseEntity<User> createUser(@Valid @RequestBody UserDTO userDTO) throws URISyntaxException {
log.debug("REST request to save User : {}", userDTO);
if (userDTO.getId() != null) {
throw new BadRequestAlertException("A new user cannot already have an ID", "userManagement", "idexists");
// Lowercase the user login before comparing with database
} else if (userRepository.findOneByLogin(userDTO.getLogin().toLowerCase()).isPresent()) {
throw new LoginAlreadyUsedException();
} else if (userRepository.findOneByEmailIgnoreCase(userDTO.getEmail()).isPresent()) {
throw new EmailAlreadyUsedException();
} else {
User newUser = userService.createUser(userDTO);
mailService.sendCreationEmail(newUser);
return ResponseEntity.created(new URI("/api/users/" + newUser.getLogin()))
.headers(HeaderUtil.createAlert( "userManagement.created", newUser.getLogin()))
.body(newUser);
}
}
