Reactive changes for samples

- Relates #750

spring-statemachine-samples/showcase/src/main/java/demo/showcase/StateMachineCommands.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 the original author or authors.
+ * Copyright 2015-2019 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.
@@ -15,6 +15,7 @@
  */
 package demo.showcase;
 
+import org.springframework.messaging.support.MessageBuilder;
 import org.springframework.shell.core.annotation.CliCommand;
 import org.springframework.shell.core.annotation.CliOption;
 import org.springframework.stereotype.Component;
@@ -22,14 +23,17 @@ import org.springframework.stereotype.Component;
 import demo.AbstractStateMachineCommands;
 import demo.showcase.Application.Events;
 import demo.showcase.Application.States;
+import reactor.core.publisher.Mono;
 
 @Component
 public class StateMachineCommands extends AbstractStateMachineCommands<States, Events> {
 
 	@CliCommand(value = "sm event", help = "Sends an event to a state machine")
 	public String event(@CliOption(key = { "", "event" }, mandatory = true, help = "The event") final Events event) {
-		getStateMachine().sendEvent(event);
+		getStateMachine()
+			.sendEvent(Mono.just(MessageBuilder
+				.withPayload(event).build()))
+			.subscribe();
 		return "Event " + event + " send";
 	}
-
-}
+}