Use http security nested builder in samples

Issue: gh-5557

samples/javaconfig/concurrency/src/main/java/org/springframework/security/samples/config/SecurityConfig.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -22,6 +22,8 @@ import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
 import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
 
+import static org.springframework.security.config.Customizer.withDefaults;
+
 @EnableWebSecurity
 @EnableGlobalMethodSecurity(prePostEnabled = true)
 public class SecurityConfig extends WebSecurityConfigurerAdapter {
@@ -40,14 +42,19 @@ public class SecurityConfig extends WebSecurityConfigurerAdapter {
 	protected void configure(
 			HttpSecurity http) throws Exception {
 		http
-			.authorizeRequests()
-				.anyRequest().authenticated()
-				.and()
-			.formLogin()
-				.and()
-			.sessionManagement()
-				.maximumSessions(1)
-					.expiredUrl("/login?expired");
+			.authorizeRequests(authorizeRequests ->
+				authorizeRequests
+					.anyRequest().authenticated()
+			)
+			.formLogin(withDefaults())
+			.sessionManagement(sessionManagement ->
+				sessionManagement
+					.sessionConcurrency(sessionConcurrency ->
+						sessionConcurrency
+							.maximumSessions(1)
+							.expiredUrl("/login?expired")
+					)
+			);
 	}
 	// @formatter:on
 }