spring valid request body custom message

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.validation.annotation.Validated;

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

    @PostMapping("/validate")
    public ResponseEntity<String> validateRequestBody(@Validated @RequestBody MyRequestDto requestDto) {
        // Business logic or validation checks here
        // ...

        // If validation passes, return success response
        return ResponseEntity.ok("Request body is valid.");

        // If validation fails, return custom error message and status code
        // return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("Custom error message");
    }
}