Migrated the following modules to parent-boot with spring-boot 2.1:

* spring-5-reactive-client
* spring-5-reactive-security
* spring-5-security
* spring-5-security-oauth
* spring-all

spring-5-reactive-security/src/main/java/com/baeldung/reactive/actuator/Spring5ReactiveApplication.java

@@ -1,9 +1,7 @@
 package com.baeldung.reactive.actuator;
 
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.context.annotation.Bean;
 
 @SpringBootApplication
 public class Spring5ReactiveApplication{

spring-5-reactive-security/src/main/java/com/baeldung/reactive/security/SpringSecurity5Application.java

@@ -8,8 +8,9 @@ import org.springframework.http.server.reactive.HttpHandler;
 import org.springframework.http.server.reactive.ReactorHttpHandlerAdapter;
 import org.springframework.web.reactive.config.EnableWebFlux;
 import org.springframework.web.server.adapter.WebHttpHandlerBuilder;
-import reactor.ipc.netty.NettyContext;
-import reactor.ipc.netty.http.server.HttpServer;
+
+import reactor.netty.DisposableServer;
+import reactor.netty.http.server.HttpServer;
 
 @ComponentScan(basePackages = {"com.baeldung.reactive.security"})
 @EnableWebFlux
@@ -18,17 +19,19 @@ public class SpringSecurity5Application {
     public static void main(String[] args) {
         try (AnnotationConfigApplicationContext context =
                      new AnnotationConfigApplicationContext(SpringSecurity5Application.class)) {
-            context.getBean(NettyContext.class).onClose().block();
+            context.getBean(DisposableServer.class).onDispose().block();
         }
     }
 
     @Bean
-    public NettyContext nettyContext(ApplicationContext context) {
+    public DisposableServer disposableServer(ApplicationContext context) {
         HttpHandler handler = WebHttpHandlerBuilder.applicationContext(context)
                 .build();
         ReactorHttpHandlerAdapter adapter = new ReactorHttpHandlerAdapter(handler);
-        HttpServer httpServer = HttpServer.create("localhost", 8080);
-        return httpServer.newHandler(adapter).block();
+        HttpServer httpServer = HttpServer.create();
+        httpServer.host("localhost");
+        httpServer.port(8080);
+        return httpServer.handle(adapter).bindNow();
     }
 
 }