fix: 파라미터 검증 및 커스텀 에러 메시지 지원

Author: neibler

src/main/java/com/ongil/backend/global/common/dto/ErrorResponse.java

@@ -32,4 +32,14 @@ public static ErrorResponse of(ErrorCode errorCode, HttpServletRequest request)
 			errorCode.getHttpStatus()
 		);
 	}
+
+	public static ErrorResponse of(ErrorCode errorCode, String message, HttpServletRequest request) {
+		return new ErrorResponse(
+			errorCode.getCode(),
+			message,
+			request.getMethod(),
+			request.getRequestURI(),
+			errorCode.getHttpStatus()
+		);
+	}
 }

src/main/java/com/ongil/backend/global/common/exception/GlobalExceptionHandler.java

@@ -19,10 +19,10 @@ public class GlobalExceptionHandler {
 	// AppException 처리
 	@ExceptionHandler(AppException.class)
 	public ResponseEntity<ErrorResponse> handleAppException(AppException e, HttpServletRequest request) {
-		log.error("AppException 발생: {}", e.getErrorCode().getMessage());
+		log.error("AppException 발생: {}", e.getMessage());
 		log.error("에러가 발생한 지점: {} {}", request.getMethod(), request.getRequestURI());
 
-		ErrorResponse errorResponse = ErrorResponse.of(e.getErrorCode(), request);
+		ErrorResponse errorResponse = ErrorResponse.of(e.getErrorCode(), e.getMessage(), request);
 		return ResponseEntity
 			.status(e.getErrorCode().getHttpStatus())
 			.body(errorResponse);