Reactive changes for samples

- Relates #750

spring-statemachine-samples/deploy/src/main/java/demo/deploy/StateMachineController.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 the original author or authors.
+ * Copyright 2016-2019 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.
@@ -29,6 +29,8 @@ import org.springframework.util.StringUtils;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 
+import reactor.core.publisher.Mono;
+
 @Controller
 public class StateMachineController {
 
@@ -59,7 +61,10 @@ public class StateMachineController {
 				}
 			}
 			listener.resetMessages();
-			stateMachine.sendEvent(MessageBuilder.createMessage(event, new MessageHeaders(headers)));
+			stateMachine
+				.sendEvent(Mono.just(MessageBuilder
+					.createMessage(event, new MessageHeaders(headers))))
+				.blockLast();
 		}
 		model.addAttribute("states", stateMachine.getState().getIds());
 		model.addAttribute("messages", listener.getMessages());