Fix checkstyle violations

spring-boot-samples/spring-boot-sample-webflux/src/main/java/sample/webflux/ExampleController.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2012-2018 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package sample.webflux;
 
 import org.springframework.http.MediaType;

spring-boot-samples/spring-boot-sample-webflux/src/main/java/sample/webflux/SampleWebFluxApplication.java

@@ -19,12 +19,11 @@ package sample.webflux;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
+import org.springframework.web.reactive.function.server.RequestPredicates;
 import org.springframework.web.reactive.function.server.RouterFunction;
+import org.springframework.web.reactive.function.server.RouterFunctions;
 import org.springframework.web.reactive.function.server.ServerResponse;
 
-import static org.springframework.web.reactive.function.server.RequestPredicates.POST;
-import static org.springframework.web.reactive.function.server.RouterFunctions.route;
-
 @SpringBootApplication
 public class SampleWebFluxApplication {
 
@@ -34,7 +33,7 @@ public class SampleWebFluxApplication {
 
 	@Bean
 	public RouterFunction<ServerResponse> monoRouterFunction(EchoHandler echoHandler) {
-		return route(POST("/echo"), echoHandler::echo);
+		return RouterFunctions.route(RequestPredicates.POST("/echo"), echoHandler::echo);
 	}
 
 }