From a2a91e3d6c2ed1d2d176e3b4eae2a9a1ac8ad2a6 Mon Sep 17 00:00:00 2001
From: Luciano Viana <luciano@weareadaptive.com>
Date: Wed, 18 Sep 2024 11:56:00 +0200
Subject: [PATCH] race condition in FakeOtfAcceptor

---
 .../uk/co/real_logic/artio/system_tests/FakeOtfAcceptor.java  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/artio-system-tests/src/test/java/uk/co/real_logic/artio/system_tests/FakeOtfAcceptor.java b/artio-system-tests/src/test/java/uk/co/real_logic/artio/system_tests/FakeOtfAcceptor.java
index 1985e00719..67aba64af3 100644
--- a/artio-system-tests/src/test/java/uk/co/real_logic/artio/system_tests/FakeOtfAcceptor.java
+++ b/artio-system-tests/src/test/java/uk/co/real_logic/artio/system_tests/FakeOtfAcceptor.java
@@ -26,8 +26,8 @@
 import uk.co.real_logic.artio.util.AsciiBuffer;
 import uk.co.real_logic.artio.util.CharFormatter;
 
-import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.function.Predicate;
 import java.util.stream.Stream;
 
@@ -43,7 +43,7 @@
  */
 public class FakeOtfAcceptor implements OtfMessageAcceptor
 {
-    private final List<FixMessage> receivedMessages = new ArrayList<>();
+    private final List<FixMessage> receivedMessages = new CopyOnWriteArrayList<>();
     private final CharFormatter formatter = new CharFormatter("Field: %s=%s");
 
     private ValidationError error;