ReactiveOAuth2ClientAutoConfiguration backs off for servlet env

Fixes gh-14463

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/client/reactive/ReactiveOAuth2ClientAutoConfiguration.java

@@ -25,6 +25,8 @@ import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.autoconfigure.condition.NoneNestedConditions;
 import org.springframework.boot.autoconfigure.security.oauth2.client.ClientsConfiguredCondition;
 import org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientProperties;
 import org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientPropertiesRegistrationAdapter;
@@ -52,6 +54,7 @@ import org.springframework.security.oauth2.client.web.server.ServerOAuth2Authori
 @Configuration
 @AutoConfigureBefore(ReactiveSecurityAutoConfiguration.class)
 @EnableConfigurationProperties(OAuth2ClientProperties.class)
+@Conditional(ReactiveOAuth2ClientAutoConfiguration.NonServletApplicationCondition.class)
 @ConditionalOnClass({ Flux.class, EnableWebFluxSecurity.class, ClientRegistration.class })
 public class ReactiveOAuth2ClientAutoConfiguration {
 
@@ -89,4 +92,17 @@ public class ReactiveOAuth2ClientAutoConfiguration {
 				authorizedClientService);
 	}
 
+	static class NonServletApplicationCondition extends NoneNestedConditions {
+
+		NonServletApplicationCondition() {
+			super(ConfigurationPhase.PARSE_CONFIGURATION);
+		}
+
+		@ConditionalOnWebApplication(type = ConditionalOnWebApplication.Type.SERVLET)
+		static class ServletApplicationCondition {
+
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/oauth2/client/reactive/ReactiveOAuth2ClientAutoConfigurationTests.java

@@ -24,6 +24,7 @@ import reactor.core.publisher.Flux;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.test.context.FilteredClassLoader;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
@@ -53,6 +54,15 @@ public class ReactiveOAuth2ClientAutoConfigurationTests {
 
 	private static final String REGISTRATION_PREFIX = "spring.security.oauth2.client.registration.login";
 
+	@Test
+	public void autoConfigurationShouldBackOffForServletEnvironments() {
+		WebApplicationContextRunner contextRunner = new WebApplicationContextRunner()
+				.withConfiguration(AutoConfigurations
+						.of(ReactiveOAuth2ClientAutoConfiguration.class));
+		contextRunner.run((context) -> assertThat(context)
+				.doesNotHaveBean(ReactiveOAuth2ClientAutoConfiguration.class));
+	}
+
 	@Test
 	public void clientRegistrationRepositoryBeanShouldNotBeCreatedWhenPropertiesAbsent() {
 		this.contextRunner.run((context) -> assertThat(context)