[FIXED] @ControllerAdvice in Exception handling

Issue

I have used the validation in my project to handle the exceptions but now I know @ ControllerAdvice is also used for exception handling can anyone tell me why I use it and what the difference is and how to use it, as I am not able to understand from the resources.

Using validation :

    @RestController
    @RequestMapping("/api")
    @Validated
    public class UserController {

        @Autowired
        UserRepository userrepo;
        
        @PostMapping(value="/users")
        ResponseEntity<?> create( @Valid @RequestBody User user) {
            
            User addeduser = userrepo.save(user);
            URI location = ServletUriComponentsBuilder.fromCurrentRequest()
                                .path("/{id}")
                                .buildAndExpand(addeduser.getId())
                                .toUri();
            
            return ResponseEntity.created(location).build();
        }

Using ControllerAdvice:

    @ControllerAdvice
    public class GlobalResponseException {
        @ExceptionHandler(MyException.class)
        public void handleMyException() {}
    }

Want I really want to know is how it's working.

Solution

@ControllerAdvice is a specialization of the @Component annotation which allows to handle exceptions across the whole application in one global handling component. It can be viewed as an interceptor of exceptions thrown by methods annotated with @RequestMapping and similar. you can also refer this: https://medium.com/@jovannypcg/understanding-springs-controlleradvice-cd96a364033f

Answered By - Janil101
Answer Checked By - Dawn Plyler (JavaFixing Volunteer)