initial

src/main/java/com/pmu/betengine/exception/GlobalExceptionHandler.java

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+package com.pmu.betengine.exception;
+
+import lombok.Data;
+import org.springframework.http.HttpStatus;
+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 java.time.LocalDateTime;
+import java.util.HashMap;
+import java.util.Map;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(RuntimeException.class)
+    public ResponseEntity<ErrorResponse> handleRuntimeException(RuntimeException ex) {
+        ErrorResponse error = new ErrorResponse(
+                HttpStatus.BAD_REQUEST.value(),
+                ex.getMessage(),
+                LocalDateTime.now()
+        );
+        return new ResponseEntity<>(error, HttpStatus.BAD_REQUEST);
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<Map<String, String>> handleValidationExceptions(MethodArgumentNotValidException ex) {
+        Map<String, String> errors = new HashMap<>();
+        ex.getBindingResult().getFieldErrors().forEach(error ->
+                errors.put(error.getField(), error.getDefaultMessage()));
+        return new ResponseEntity<>(errors, HttpStatus.BAD_REQUEST);
+    }
+
+    @Data
+    public static class ErrorResponse {
+        private int status;
+        private String message;
+        private LocalDateTime timestamp;
+
+        public ErrorResponse(int status, String message, LocalDateTime timestamp) {
+            this.status = status;
+            this.message = message;
+            this.timestamp = timestamp;
+        }
+    }
+}