Fix MessagingGateway for reactive reply type

* Upgrade dependencies to be ready for release

build.gradle

@@ -45,24 +45,24 @@ ext {
 	modifiedFiles =
 			files(grgit.status().unstaged.modified).filter{ f -> f.name.endsWith('.java') || f.name.endsWith('.kt') }
 
-	activeMqVersion = '5.15.12'
-	apacheSshdVersion = '2.4.0'
+	activeMqVersion = '5.15.13'
+	apacheSshdVersion = '2.5.0'
 	aspectjVersion = '1.9.5'
 	assertjVersion = '3.16.1'
 	assertkVersion = '0.22'
 	avroVersion = '1.9.2'
 	awaitilityVersion = '4.0.3'
 	commonsDbcp2Version = '2.7.0'
-	commonsIoVersion = '2.6'
+	commonsIoVersion = '2.7'
 	commonsNetVersion = '3.6'
 	curatorVersion = '4.3.0'
 	derbyVersion = '10.14.2.0'
 	ftpServerVersion = '1.1.1'
 	googleJsr305Version = '3.0.2'
-	groovyVersion = '3.0.3'
+	groovyVersion = '3.0.4'
 	hamcrestVersion = '2.2'
 	hazelcastVersion = '4.0.1'
-	hibernateVersion = '5.4.14.Final'
+	hibernateVersion = '5.4.18.Final'
 	hsqldbVersion = '2.5.0'
 	h2Version = '1.4.200'
 	jacksonVersion = '2.11.0'
@@ -77,19 +77,19 @@ ext {
 	jschVersion = '0.1.55'
 	jsonpathVersion = '2.4.0'
 	junit4Version = '4.13'
-	junitJupiterVersion = '5.6.2'
+	junitJupiterVersion = '5.7.0-M1'
 	jythonVersion = '2.7.2'
 	kryoShadedVersion = '4.0.2'
-	lettuceVersion = '5.3.0.RELEASE'
-	log4jVersion = '2.13.2'
-	micrometerVersion = '1.5.1'
+	lettuceVersion = '6.0.0.M1'
+	log4jVersion = '2.13.3'
+	micrometerVersion = '1.5.2'
 	mockitoVersion = '3.3.3'
-	mongoDriverVersion = '4.0.3'
+	mongoDriverVersion = '4.0.4'
 	mysqlVersion = '8.0.20'
 	pahoMqttClientVersion = '1.2.2'
-	postgresVersion = '42.2.12'
+	postgresVersion = '42.2.14'
 	reactorVersion = '2020.0.0-M1'
-	resilience4jVersion = '1.4.0'
+	resilience4jVersion = '1.5.0'
 	romeToolsVersion = '1.12.2'
 	rsocketVersion = '1.0.1'
 	saajVersion = '1.5.2'
@@ -102,7 +102,7 @@ ext {
 	springRetryVersion = '1.3.0'
 	springVersion = project.hasProperty('springVersion') ? project.springVersion : '5.3.0-SNAPSHOT'
 	springWsVersion = '3.0.9.RELEASE'
-	tomcatVersion = "9.0.35"
+	tomcatVersion = "9.0.36"
 	xstreamVersion = '1.4.12'
 
 	javaProjects = subprojects - project(':spring-integration-bom')
@@ -325,7 +325,7 @@ configure(javaProjects) { subproject ->
 
 	checkstyle {
 		configDirectory.set(rootProject.file("src/checkstyle"))
-		toolVersion = project.hasProperty('checkstyleVersion') ? project.checkstyleVersion : '8.32'
+		toolVersion = project.hasProperty('checkstyleVersion') ? project.checkstyleVersion : '8.33'
 	}
 
 	jar {

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.4.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

spring-integration-core/src/main/java/org/springframework/integration/gateway/MessagingGatewaySupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -875,8 +875,7 @@ public boolean send(Message<?> message, long timeout) {
 
 		@Override
 		public void subscribeTo(Publisher<? extends Message<?>> publisher) {
-			this.replyMono.switchIfEmpty(Mono.from(publisher));
-			this.replyMono.onComplete();
+			publisher.subscribe(this.replyMono);
 		}
 
 	}

spring-integration-core/src/main/java/org/springframework/integration/handler/AbstractMessageProducingHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2019 the original author or authors.
+ * Copyright 2014-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -299,21 +299,26 @@ else if (reply instanceof AbstractIntegrationMessageBuilder<?>) {
 	}
 
 	private void doProduceOutput(Message<?> requestMessage, MessageHeaders requestHeaders, Object reply,
-			@Nullable Object replyChannel) {
+			@Nullable Object replyChannelArg) {
+
+		Object replyChannel = replyChannelArg;
+		if (replyChannel == null) {
+			replyChannel = getOutputChannel();
+		}
 
 		if (this.async && (reply instanceof ListenableFuture<?> || reply instanceof Publisher<?>)) {
-			MessageChannel messageChannel = getOutputChannel();
-			if (reply instanceof ListenableFuture<?> ||
-					!(messageChannel instanceof ReactiveStreamsSubscribableChannel)) {
-				asyncNonReactiveReply(requestMessage, reply, replyChannel);
-			}
-			else {
-				((ReactiveStreamsSubscribableChannel) messageChannel)
+			if (reply instanceof Publisher<?> &&
+					replyChannel instanceof ReactiveStreamsSubscribableChannel) {
+
+				((ReactiveStreamsSubscribableChannel) replyChannel)
 						.subscribeTo(
 								Flux.from((Publisher<?>) reply)
 										.doOnError((ex) -> sendErrorMessage(requestMessage, ex))
 										.map(result -> createOutputMessage(result, requestHeaders)));
 			}
+			else {
+				asyncNonReactiveReply(requestMessage, reply, replyChannel);
+			}
 		}
 		else {
 			sendOutput(createOutputMessage(reply, requestHeaders), replyChannel, false);

spring-integration-rsocket/src/test/java/org/springframework/integration/rsocket/dsl/RSocketDslTests.java

@@ -112,7 +112,7 @@ public IntegrationFlow rsocketUpperCaseFlow() {
 			return IntegrationFlows
 					.from(RSockets.inboundGateway("/uppercase")
 							.interactionModels(RSocketInteractionModel.requestChannel))
-					.<Flux<String>>handle((payload, headers) -> payload.map(String::toUpperCase), e -> e.async(true))
+					.<Flux<String>, Flux<String>>transform((flux) -> flux.map(String::toUpperCase))
 					.get();
 		}