From ab68210d2ace09d73a9468d908e61ab56750bb31 Mon Sep 17 00:00:00 2001
From: PJ Fanning <fanningpj@apache.org>
Date: Tue, 15 Oct 2024 12:58:33 +0000
Subject: [github-709] Make BitFieldFactory threadsafe. Thanks to ZhangChen.
 This closes #709

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1921332 13f79535-47bb-0310-9956-ffa450edef68
---
 poi/src/main/java/org/apache/poi/util/BitFieldFactory.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'poi')

diff --git a/poi/src/main/java/org/apache/poi/util/BitFieldFactory.java b/poi/src/main/java/org/apache/poi/util/BitFieldFactory.java
index 4893d5e61b..40e69cb0bd 100644
--- a/poi/src/main/java/org/apache/poi/util/BitFieldFactory.java
+++ b/poi/src/main/java/org/apache/poi/util/BitFieldFactory.java
@@ -18,13 +18,13 @@
 
 package org.apache.poi.util;
 
-import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * Returns immutable Bitfield instances.
  */
 public class BitFieldFactory {
-    private static Map<Integer, BitField> instances = new HashMap<>();
+    private static final ConcurrentHashMap<Integer, BitField> instances = new ConcurrentHashMap<>();
 
     public static BitField getInstance(int mask) {
         return instances.computeIfAbsent(mask, k -> new BitField(mask));
-- 
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