Spring Cloud authentication with JWT service

RequestMethod.POST)
    public ResponseEntity<AuthTokenDTO> authenticate(@Valid @RequestBody AuthenticationDTO authenticationDTO) {
        User user = userManagementService.authenticateUser(
                authenticationDTO.getEmail(), authenticationDTO.getPassword());
        if (user != null) {
            return new ResponseEntity<>(buildAuthenticationTokenFromUser(user), HttpStatus.OK);
        } else {
            return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
        }
    }

​​https://github.com/vdubois/spring-cloud-sample-authentication-service/blob/a442f7a10bf9529dbb68b669ed394fed51fcc330/src/main/java/io/github/vdubois/controller/AuthenticationController.java​​