fix

 package com.yohobuy.platform.grass.service.impl;
 
 
+import com.google.common.collect.Lists;
 import com.yoho.core.config.ConfigReader;
 import com.yoho.core.rest.client.ServiceCaller;
 import com.yoho.service.model.sns.model.enums.GrassInboxBusinessTypeEnum;
@@ -95,13 +96,14 @@ public class GrassUserVirtualImpl implements IGrassVirtualService{
                         for (GrassInBoxAddReq message : messageList) {
                             l.add(message);
                             if (l.size() % batchSize == 0) {
-                                sendMessage(l);
-                                l.clear();
+                                List<GrassInBoxAddReq> reqlist = Lists.newArrayList(l);
+                                sendMessage(reqlist);
                                 try {
                                     Thread.sleep(1000);
                                 } catch (InterruptedException e) {
                                     e.printStackTrace();
                                 }
+                                l.clear();
                             }
                         }
                         if (CollectionUtils.isNotEmpty(l)) {