[FIXED] Java APIRest - Postman error 400 bad request with GET method and JWT

Issue

When I log in to my API via postman, a JWT is generated. With this jwt I create data for a specific user. But when I am connected with this user and his JWT, when I make a GET request from POSTMAN with the connected user's JWT, I get a 400 error saying that the request is bad. I do not understand why. My Tomcat server port IS NOT 8080 but 7777... Just bellow my controller with GET method :

        @CrossOrigin(origins = "*")
        @RestController
        @RequestMapping("/weights")
        public class WeightRecordController {
        
           
            @Autowired
            AppUserRepository appUserRepository;
        
            @Autowired
            PersonRepository personRepository;
        
            private final Logger logger = LoggerFactory.getLogger(WeightRecordController.class);
        
            public Long getAppUserConnectedId(Principal principal) {
                if (!(principal instanceof UsernamePasswordAuthenticationToken)) {
                    throw new RuntimeException(("User not found"));
                }
                logger.info("USER IS PRESENT IN DATABASE FROM FUNCTION 'getAppUserConnectedId()'");
                UsernamePasswordAuthenticationToken token = (UsernamePasswordAuthenticationToken) principal;
                AppUser appUserFinded = appUserRepository.findByAppUsername(token.getName());
                return appUserFinded.getIdUser();
            }
        
            @GetMapping("/all")
            public ResponseEntity<List<WeightRecord>> getAllWeights(@RequestParam Principal principal) {
                logger.info("GET /weights/all");
                Long appUserConnectedId = this.getAppUserConnectedId(principal);
                Person personToShow = personRepository.findById(appUserConnectedId).orElseThrow();
                return new ResponseEntity<List<WeightRecord>>(personToShow.getWeightsList(), HttpStatus.OK);
            }
    }

Solution

In fact JWT token is transfered by request's header, so i have simply delete the @RequestParam from my endpoint and it work ! Just bellow my new code for the endpoint concerned :

@GetMapping("/all")
public ResponseEntity<List<WeightRecord>> getAllWeights(Principal principal) {
    logger.info("GET /weights/all");
    Long appUserConnectedId = this.getAppUserConnectedId(principal);
    Person personToShow = personRepository.findById(appUserConnectedId).orElseThrow();
    return new ResponseEntity<List<WeightRecord>>(personToShow.getWeightsList(), HttpStatus.OK);
}

Answered By - Quentin Genet
Answer Checked By - Mildred Charles (JavaFixing Admin)