Nest @EnableWebFluxSecurity to avoid overzealous Wildfly warnings

Closes gh-12174

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/reactive/WebFluxSecurityConfiguration.java

@@ -19,6 +19,7 @@ package org.springframework.boot.autoconfigure.security.reactive;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
 import org.springframework.security.web.server.WebFilterChainProxy;
 
@@ -33,7 +34,12 @@ import org.springframework.security.web.server.WebFilterChainProxy;
 @ConditionalOnClass({ EnableWebFluxSecurity.class, WebFilterChainProxy.class })
 @ConditionalOnMissingBean(WebFilterChainProxy.class)
 @ConditionalOnWebApplication(type = ConditionalOnWebApplication.Type.REACTIVE)
-@EnableWebFluxSecurity
 class WebFluxSecurityConfiguration {
 
+	@Configuration
+	@EnableWebFluxSecurity
+	class EnableWebFluxSecurityConfiguration {
+
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/reactive/WebFluxSecurityConfigurationTests.java

@@ -39,8 +39,9 @@ public class WebFluxSecurityConfigurationTests {
 	@Test
 	public void backsOffWhenWebFilterChainProxyBeanPresent() {
 		this.contextRunner
-				.withUserConfiguration(WebFilterChainProxyConfiguration.class,
-						WebFluxSecurityConfiguration.class)
+				.withConfiguration(
+						AutoConfigurations.of(ReactiveSecurityAutoConfiguration.class))
+				.withUserConfiguration(WebFilterChainProxyConfiguration.class)
 				.run((context) -> assertThat(context)
 						.doesNotHaveBean(WebFluxSecurityConfiguration.class));
 	}