Use spring-javaformat to format and check code

Resolves: #1450

spring-session-docs/src/test/java/docs/websocket/WebSocketConfig.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2018 the original author or authors.
+ * Copyright 2014-2019 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.
@@ -42,5 +42,6 @@ public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
 		registry.enableSimpleBroker("/queue/", "/topic/");
 		registry.setApplicationDestinationPrefixes("/app");
 	}
+
 }
 // end::class[]