init

src/main/java/com/gmp/mock/handler/GlobalExceptionHandler.java

@@ -0,0 +1,22 @@
+package com.gmp.mock.handler;
+
+import java.util.stream.Collectors;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import com.gmp.mock.dto.ApiResponse;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<ApiResponse<Void>> handleValidation(MethodArgumentNotValidException ex) {
+        String message = ex.getBindingResult().getFieldErrors().stream()
+                .map(e -> e.getDefaultMessage())
+                .collect(Collectors.joining("; "));
+        return ResponseEntity.ok(ApiResponse.error(400, message));
+    }
+}