From 4b41801bca2a6ead24434b87ef16019196e66686 Mon Sep 17 00:00:00 2001
From: genjigjj <18812674687@163.com>
Date: Mon, 22 Dec 2025 10:29:04 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E4=BD=BF=E7=94=A8FileRefresh?=
 =?UTF-8?q?ableDataSource=E4=BD=9C=E4=B8=BA=E8=A7=84=E5=88=99=E6=95=B0?=
 =?UTF-8?q?=E6=8D=AE=E6=BA=90=E6=97=B6=EF=BC=8C=E5=88=9D=E5=A7=8B=E5=8C=96?=
 =?UTF-8?q?=E7=A9=BA=E8=A7=84=E5=88=99=E6=96=87=E4=BB=B6=E4=BC=9A=E5=AF=BC?=
 =?UTF-8?q?=E8=87=B4StringIndexOutOfBoundsException=E5=BC=82=E5=B8=B8?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../csp/sentinel/datasource/FileRefreshableDataSource.java     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sentinel-extension/sentinel-datasource-extension/src/main/java/com/alibaba/csp/sentinel/datasource/FileRefreshableDataSource.java b/sentinel-extension/sentinel-datasource-extension/src/main/java/com/alibaba/csp/sentinel/datasource/FileRefreshableDataSource.java
index 4329061144..f31177f764 100755
--- a/sentinel-extension/sentinel-datasource-extension/src/main/java/com/alibaba/csp/sentinel/datasource/FileRefreshableDataSource.java
+++ b/sentinel-extension/sentinel-datasource-extension/src/main/java/com/alibaba/csp/sentinel/datasource/FileRefreshableDataSource.java
@@ -118,6 +118,9 @@ public String readSource() throws Exception {
                     + ", is bigger than bufSize=" + buf.length + ". Can't read");
             }
             int len = inputStream.read(buf);
+            if (len == -1) {
+                return null;
+            }
             return new String(buf, 0, len, charset);
         } finally {
             if (inputStream != null) {