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@RestController
@RequestMapping("/api")
@Validated
public class UserController {
    
    @PostMapping("/user")
    public ResponseEntity<String> createUser(@Valid @RequestBody UserDto userDto) {
        // 澶勭悊璇锋眰鍙傛暟
        return ResponseEntity.ok("User created successfully");
    }
}

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public class UserDto {

    @NotBlank(message = "Name is mandatory")
    private String name;

    @Email(message = "Email should be valid")
    private String email;

    // getter and setter
}

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@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ResponseBody
    public ResponseEntity<String> handleValidationException(MethodArgumentNotValidException ex) {
        BindingResult result = ex.getBindingResult();
        List<String> errorMessages = result.getAllErrors().stream()
                .map(DefaultMessageSourceResolvable::getDefaultMessage)
                .collect(Collectors.toList());
        return ResponseEntity.badRequest().body(String.join(", ", errorMessages));
    }
}

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