From 6a7e58ac82e4e2c5e31031587da45428c1b46e89 Mon Sep 17 00:00:00 2001
From: Philippe Marschall <philippe.marschall@gmail.com>
Date: Sun, 9 Aug 2020 13:52:26 +0200
Subject: [PATCH] Add @FunctionalInterface to MessagePostProcessor

Add the @FunctionalInterface annotation to the MessagePostProcessor
interfaces in the spring-jms and spring-messaging projects.

Closes gh-25571
---
 .../java/org/springframework/jms/core/MessagePostProcessor.java  | 1 +
 .../org/springframework/messaging/core/MessagePostProcessor.java | 1 +
 2 files changed, 2 insertions(+)

diff --git a/spring-jms/src/main/java/org/springframework/jms/core/MessagePostProcessor.java b/spring-jms/src/main/java/org/springframework/jms/core/MessagePostProcessor.java
index c36c7dafb66..bb7b80a90dc 100644
--- a/spring-jms/src/main/java/org/springframework/jms/core/MessagePostProcessor.java
+++ b/spring-jms/src/main/java/org/springframework/jms/core/MessagePostProcessor.java
@@ -32,6 +32,7 @@ import javax.jms.Message;
  * @see JmsTemplate#convertAndSend(javax.jms.Destination, Object, MessagePostProcessor)
  * @see org.springframework.jms.support.converter.MessageConverter
  */
+@FunctionalInterface
 public interface MessagePostProcessor {
 
 	/**
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/core/MessagePostProcessor.java b/spring-messaging/src/main/java/org/springframework/messaging/core/MessagePostProcessor.java
index 92e78ef50e7..f4e6ceee4f6 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/core/MessagePostProcessor.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/core/MessagePostProcessor.java
@@ -28,6 +28,7 @@ import org.springframework.messaging.Message;
  * @see MessageSendingOperations
  * @see MessageRequestReplyOperations
  */
+@FunctionalInterface
 public interface MessagePostProcessor {
 
 	/**