IllegalStateException(동시성 문제)관련 처리 메소드 추가.

Author: Kimgooner

src/main/java/org/tuna/zoopzoop/backend/domain/archive/folder/controller/FolderController.java

@@ -37,7 +37,6 @@ public RsData<resBodyForCreateFolder> createFolder(
     ) {
         Member member = userDetails.getMember();
         FolderResponse createFile = folderService.createFolderForPersonal(member.getId(), rq.folderName());
-
         resBodyForCreateFolder rs = new resBodyForCreateFolder(createFile.folderName(), createFile.folderId());
 
         return new RsData<>(

src/main/java/org/tuna/zoopzoop/backend/global/exception/GlobalExceptionHandler.java

@@ -189,6 +189,17 @@ public ResponseEntity<RsData<Void>> handleSecurityException(SecurityException e)
         );
     }
 
+    @ExceptionHandler(IllegalStateException.class) // 동시성 에러
+    public ResponseEntity<RsData<Void>> handleIllegalStateException(IllegalStateException e) {
+        return new ResponseEntity<>(
+                new RsData<>(
+                        "409",
+                        e.getMessage()
+                ),
+                CONFLICT
+        );
+    }
+
     @ExceptionHandler(Exception.class) // 내부 서버 에러(= 따로 Exception을 지정하지 않은 경우.)
     public ResponseEntity<RsData<Void>> handleException(Exception e) {
         return new ResponseEntity<>(