fix

stmms-web/src/main/java/cn/com/qmth/stmms/admin/exam/DataSyncController.java

@@ -130,8 +130,7 @@ public class DataSyncController extends BaseExamController {
                     dataSyncService, examService, studentService, subjectService);
             taskExecutor.submit(thread);
         }
-        DataSync sync = dataSyncService.findByExamId(examId);
-        if (sync == null) {
+        if (lockService.isLocked(LockType.DATA_SYNC, examId)) {
             addMessage(redirectAttributes, "同步失败");
         } else {
             addMessage(redirectAttributes, "创建成功");