From 07913e7d5160b86391bf21f739276e459d9aa83f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=93=81=E7=94=B2=E5=B0=8F=E5=AE=9D?= <2922035952@qq.com>
Date: Thu, 18 Jul 2024 01:01:29 +0800
Subject: [PATCH] A small code specification change. (#2299)

---
 .../apache/hertzbeat/manager/service/impl/MailServiceImpl.java  | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/manager/src/main/java/org/apache/hertzbeat/manager/service/impl/MailServiceImpl.java b/manager/src/main/java/org/apache/hertzbeat/manager/service/impl/MailServiceImpl.java
index 4e91ea73d6f..ec627f81548 100644
--- a/manager/src/main/java/org/apache/hertzbeat/manager/service/impl/MailServiceImpl.java
+++ b/manager/src/main/java/org/apache/hertzbeat/manager/service/impl/MailServiceImpl.java
@@ -18,6 +18,7 @@
 package org.apache.hertzbeat.manager.service.impl;
 
 import freemarker.cache.StringTemplateLoader;
+import freemarker.core.TemplateClassResolver;
 import freemarker.template.Configuration;
 import freemarker.template.TemplateException;
 import java.io.IOException;
@@ -99,6 +100,7 @@ public String buildAlertHtmlTemplate(final Alert alert, NoticeTemplate noticeTem
         String templateName = "mailTemplate";
         stringLoader.putTemplate(templateName, noticeTemplate.getContent());
         cfg.setTemplateLoader(stringLoader);
+        cfg.setNewBuiltinClassResolver(TemplateClassResolver.SAFER_RESOLVER);
         templateMail = cfg.getTemplate(templateName, Locale.CHINESE);
         return FreeMarkerTemplateUtils.processTemplateIntoString(templateMail, model);
     }