From b357de2c2232658a053074044777ac8dd3758022 Mon Sep 17 00:00:00 2001
From: Philippe Marschall <philippe.marschall@gmail.com>
Date: Wed, 1 Sep 2021 14:31:53 +0200
Subject: [PATCH] Make  JobParameters#getParameters() immutable

Make  JobParameters#getParameters() immutable and avoid the defensive
copy.

Fixes #3980
---
 .../java/org/springframework/batch/core/JobParameters.java     | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/JobParameters.java b/spring-batch-core/src/main/java/org/springframework/batch/core/JobParameters.java
index bde6eea910..237fed7f81 100644
--- a/spring-batch-core/src/main/java/org/springframework/batch/core/JobParameters.java
+++ b/spring-batch-core/src/main/java/org/springframework/batch/core/JobParameters.java
@@ -17,6 +17,7 @@
 package org.springframework.batch.core;
 
 import java.io.Serializable;
+import java.util.Collections;
 import java.util.Date;
 import java.util.LinkedHashMap;
 import java.util.Map;
@@ -191,7 +192,7 @@ public Date getDate(String key, @Nullable Date defaultValue){
 	 * @return an unmodifiable map containing all parameters.
 	 */
 	public Map<String, JobParameter> getParameters(){
-		return new LinkedHashMap<>(parameters);
+		return Collections.unmodifiableMap(parameters);
 	}
 
 	/**