From 9a4aad33853cbd130a1b5935093c3d80d05bd3b7 Mon Sep 17 00:00:00 2001
From: Mathias Roeppischer <mathias.roeppischer@mgm-tp.com>
Date: Fri, 7 Aug 2026 22:11:23 +0200
Subject: [PATCH] ignite-28951:
 TcpDiscoverySharedFsIpFinder#getRegisteredAddresses() does not handle
 File.list() returning null

* handle File.list() == null by throwing IgniteSpiException
---
 .../ipfinder/sharedfs/TcpDiscoverySharedFsIpFinder.java    | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/modules/core/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/sharedfs/TcpDiscoverySharedFsIpFinder.java b/modules/core/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/sharedfs/TcpDiscoverySharedFsIpFinder.java
index a2b035ec6ccbf..e3fe39dcfb2cd 100644
--- a/modules/core/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/sharedfs/TcpDiscoverySharedFsIpFinder.java
+++ b/modules/core/src/main/java/org/apache/ignite/spi/discovery/tcp/ipfinder/sharedfs/TcpDiscoverySharedFsIpFinder.java
@@ -185,8 +185,13 @@ private File initFolder() throws IgniteSpiException {
         initFolder();
 
         Collection<InetSocketAddress> addrs = new LinkedList<>();
+        String[] fileNames = folder.list();
 
-        for (String fileName : folder.list()) {
+        if (fileNames == null)
+            throw new IgniteSpiException("Failed to list files in shared FS directory: " + folder
+                + ". Verify that the directory exists and the shared filesystem is accessible.");
+
+        for (String fileName : fileNames) {
             StringTokenizer st = new StringTokenizer(fileName, DELIM);
 
             if (st.countTokens() != 2)