Optimize type conversion in LambdaMessageProcessor

Author: artembilan

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 the original author or authors.
+ * Copyright 2016-2018 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.
@@ -35,6 +35,7 @@
 import org.springframework.messaging.Message;
 import org.springframework.messaging.MessageHandlingException;
 import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
 import org.springframework.util.ReflectionUtils;
 
 /**
@@ -114,7 +115,9 @@ else if (Map.class.isAssignableFrom(parameterType)) {
 				}
 			}
 			else {
-				if (this.payloadType != null) {
+				if (this.payloadType != null &&
+						!ClassUtils.isAssignable(this.payloadType.getType(), message.getPayload().getClass())) {
+
 					if (Message.class.isAssignableFrom(this.payloadType.getType())) {
 						args[i] = message;
 					}