From 8cd283729b3cb8f1ed5499f9d60b201d6fb03f23 Mon Sep 17 00:00:00 2001
From: Juergen Hoeller <jhoeller@pivotal.io>
Date: Tue, 25 Aug 2015 17:54:54 +0200
Subject: [PATCH] MessageHeaders returns completely immutable entry set (no
 entry.setValue call allowed)

Issue: SPR-13385
---
 .../main/java/org/springframework/messaging/MessageHeaders.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/spring-messaging/src/main/java/org/springframework/messaging/MessageHeaders.java b/spring-messaging/src/main/java/org/springframework/messaging/MessageHeaders.java
index a227e8d6e8..0ebea02993 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/MessageHeaders.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/MessageHeaders.java
@@ -207,7 +207,7 @@ public class MessageHeaders implements Map<String, Object>, Serializable {
 	}
 
 	public Set<Map.Entry<String, Object>> entrySet() {
-		return Collections.unmodifiableSet(this.headers.entrySet());
+		return Collections.unmodifiableMap(this.headers).entrySet();
 	}
 
 	public Object get(Object key) {