Fixed an issue with openapi item comment being too long (#2849)

apollo-portal/src/main/java/com/ctrip/framework/apollo/openapi/v1/controller/ItemController.java

@@ -60,6 +60,10 @@ public class ItemController {
       throw new BadRequestException("User " + item.getDataChangeCreatedBy() + " doesn't exist!");
     }
 
+    if(!StringUtils.isEmpty(item.getComment()) && item.getComment().length() > 64){
+      throw new BadRequestException("Comment length should not exceed 64 characters");
+    }
+
     ItemDTO toCreate = OpenApiBeanUtils.transformToItemDTO(item);
 
     //protect
@@ -93,6 +97,10 @@ public class ItemController {
       throw new BadRequestException("user(dataChangeLastModifiedBy) not exists");
     }
 
+    if(!StringUtils.isEmpty(item.getComment()) && item.getComment().length() > 64){
+      throw new BadRequestException("Comment length should not exceed 64 characters");
+    }
+
     try {
       ItemDTO toUpdateItem = itemService
           .loadItem(Env.fromString(env), appId, clusterName, namespaceName, item.getKey());