Use http security nested builder in samples

Issue: gh-5557

samples/boot/helloworld/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.
@@ -32,11 +32,16 @@ public class SecurityConfig extends WebSecurityConfigurerAdapter {
 	@Override
 	protected void configure(HttpSecurity http) throws Exception {
 		http
-				.authorizeRequests()
-					.antMatchers("/css/**", "/index").permitAll()
-					.antMatchers("/user/**").hasRole("USER")
-					.and()
-				.formLogin().loginPage("/login").failureUrl("/login-error");
+				.authorizeRequests(authorizeRequests ->
+					authorizeRequests
+						.antMatchers("/css/**", "/index").permitAll()
+						.antMatchers("/user/**").hasRole("USER")
+				)
+				.formLogin(formLogin ->
+					formLogin
+						.loginPage("/login")
+						.failureUrl("/login-error")
+				);
 	}
 	// @formatter:on