From c8d1dfebab902f4372a924f507b8cc00653ce55c Mon Sep 17 00:00:00 2001
From: dugenkui03 <dugk@foxmail.com>
Date: Sat, 16 Apr 2022 21:21:18 +0800
Subject: [PATCH] Make event handling in JobExecutionExitCodeGenerator
 thread-safe

See gh-30705
---
 .../autoconfigure/batch/JobExecutionExitCodeGenerator.java    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/batch/JobExecutionExitCodeGenerator.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/batch/JobExecutionExitCodeGenerator.java
index 28f2d3b141..cd5ce6e511 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/batch/JobExecutionExitCodeGenerator.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/batch/JobExecutionExitCodeGenerator.java
@@ -16,8 +16,8 @@
 
 package org.springframework.boot.autoconfigure.batch;
 
-import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
 
 import org.springframework.batch.core.JobExecution;
 import org.springframework.boot.ExitCodeGenerator;
@@ -31,7 +31,7 @@ import org.springframework.context.ApplicationListener;
  */
 public class JobExecutionExitCodeGenerator implements ApplicationListener<JobExecutionEvent>, ExitCodeGenerator {
 
-	private final List<JobExecution> executions = new ArrayList<>();
+	private final List<JobExecution> executions = new CopyOnWriteArrayList<>();
 
 	@Override
 	public void onApplicationEvent(JobExecutionEvent event) {