diff --git a/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/filedb/FileDatabaseService.java b/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/filedb/FileDatabaseService.java
index 45ae505a..9d054f01 100644
--- a/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/filedb/FileDatabaseService.java
+++ b/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/filedb/FileDatabaseService.java
@@ -56,6 +56,8 @@ import cn.azxo.framework.common.model.Page;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
+import javax.annotation.Nullable;
+
 /**
  * @author yanglin
  */
@@ -118,7 +120,7 @@ public class FileDatabaseService {
 		asyncUtils.getOrTimeout(future, "激活");
 	}
 
-	private Future<?> asyncCopySubtree(FileDatabase db, IndexNode templateRoot, Runnable nullablePostProcessor) {
+	private Future<?> asyncCopySubtree(FileDatabase db, IndexNode templateRoot, @Nullable Runnable postProcessor) {
 		return indexManager.async(() -> {
 			// don't inline in transaction
 			CopiedOssFiles copiedOssFiles = indexManager.copySubtreeOssFiles(templateRoot);
@@ -129,8 +131,8 @@ public class FileDatabaseService {
 				indexManager.copySubTree(templateRoot, null, new SetScopeCopyFileVisitor(copiedOssFiles, db));
 				fileDatabaseDao.updateState(db.getCode(), FileDatabaseState.ACTIVATED);
 				fileDatabaseDao.setPurchaseTime(db.getCode(), new Date());
-				if (nullablePostProcessor != null)
-					nullablePostProcessor.run();
+				if (postProcessor != null)
+					postProcessor.run();
 			});
 		});
 	}