INT-901 Resolved issue with inadvertent reply splitting. This might not be the permanent solution (may refactor AbstractMessageSplitter to inherit directly from AbstractMessageHandler).

org.springframework.integration/src/main/java/org/springframework/integration/handler/AbstractReplyProducingMessageHandler.java

@@ -92,6 +92,10 @@ public abstract class AbstractReplyProducingMessageHandler extends AbstractMessa
 		}
 	}
 
+	protected boolean shouldSplitReplies() {
+		return false;
+	}
+
 	/**
 	 * {@inheritDoc}
 	 */
@@ -111,7 +115,7 @@ public abstract class AbstractReplyProducingMessageHandler extends AbstractMessa
 		}
 		MessageChannel replyChannel = resolveReplyChannel(message, this.outputChannel, this.channelResolver);
 		MessageHeaders requestHeaders = message.getHeaders();
-		if (result instanceof Iterable) {
+		if (this.shouldSplitReplies() && result instanceof Iterable) {
 			this.sendReplyMessages((Iterable) result, requestHeaders, replyChannel);
 		}
 		else {

org.springframework.integration/src/main/java/org/springframework/integration/splitter/AbstractMessageSplitter.java

@@ -33,6 +33,11 @@ import org.springframework.integration.message.MessageBuilder;
  */
 public abstract class AbstractMessageSplitter extends AbstractReplyProducingMessageHandler {
 
+	@Override
+	protected boolean shouldSplitReplies() {
+		return true;
+	}
+
 	@Override
 	protected final Object handleRequestMessage(Message<?> message) {
 		Object result = this.splitMessage(message);