Provide a configuration option to enable lazy initialization

Closes gh-15870

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -29,7 +29,7 @@ import static org.springframework.web.reactive.function.server.RouterFunctions.r
 public class SampleWebFluxApplication {
 
 	public static void main(String[] args) {
-		SpringApplication.run(SampleWebFluxApplication.class);
+		SpringApplication.run(SampleWebFluxApplication.class, args);
 	}
 
 	@Bean