Revert "Configure virtual threads on Undertow if enabled"

This reverts commit cff1b33f8e.

See gh-38819

Closes gh-39812

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/embedded/EmbeddedWebServerFactoryCustomizerAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -34,18 +34,15 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplicat
 import org.springframework.boot.autoconfigure.thread.Threading;
 import org.springframework.boot.autoconfigure.web.ServerProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
-import org.springframework.boot.web.embedded.undertow.UndertowDeploymentInfoCustomizer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.env.Environment;
-import org.springframework.core.task.VirtualThreadTaskExecutor;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for embedded servlet and reactive
  * web servers customizations.
  *
  * @author Phillip Webb
- * @author Moritz Halbritter
  * @since 2.0.0
  */
 @AutoConfiguration
@@ -110,12 +107,6 @@ public class EmbeddedWebServerFactoryCustomizerAutoConfiguration {
 			return new UndertowWebServerFactoryCustomizer(environment, serverProperties);
 		}
 
-		@Bean
-		@ConditionalOnThreading(Threading.VIRTUAL)
-		UndertowDeploymentInfoCustomizer virtualThreadsUndertowDeploymentInfoCustomizer() {
-			return (deploymentInfo) -> deploymentInfo.setExecutor(new VirtualThreadTaskExecutor("undertow-"));
-		}
-
 	}
 
 	/**

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/embedded/UndertowWebServerFactoryCustomizer.java

@@ -77,7 +77,8 @@ public class UndertowWebServerFactoryCustomizer
 	public void customize(ConfigurableUndertowWebServerFactory factory) {
 		PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
 		ServerOptions options = new ServerOptions(factory);
-		map.from(this.serverProperties::getMaxHttpRequestHeaderSize)
+		ServerProperties properties = this.serverProperties;
+		map.from(properties::getMaxHttpRequestHeaderSize)
 			.asInt(DataSize::toBytes)
 			.when(this::isPositive)
 			.to(options.option(UndertowOptions.MAX_HEADER_SIZE));

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/embedded/UndertowWebServerFactoryCustomizerConfigurationTests.java

@@ -1,57 +0,0 @@
-/*
- * Copyright 2012-2024 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.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.autoconfigure.web.embedded;
-
-import io.undertow.servlet.api.DeploymentInfo;
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.condition.EnabledForJreRange;
-import org.junit.jupiter.api.condition.JRE;
-
-import org.springframework.boot.autoconfigure.AutoConfigurations;
-import org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration.UndertowWebServerFactoryCustomizerConfiguration;
-import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
-import org.springframework.boot.web.embedded.undertow.UndertowDeploymentInfoCustomizer;
-import org.springframework.boot.web.servlet.context.AnnotationConfigServletWebApplicationContext;
-import org.springframework.core.task.VirtualThreadTaskExecutor;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
-/**
- * Tests for {@link UndertowWebServerFactoryCustomizerConfiguration}.
- *
- * @author Moritz Halbritter
- */
-class UndertowWebServerFactoryCustomizerConfigurationTests {
-
-	private final WebApplicationContextRunner contextRunner = new WebApplicationContextRunner(
-			AnnotationConfigServletWebApplicationContext::new)
-		.withConfiguration(AutoConfigurations.of(EmbeddedWebServerFactoryCustomizerAutoConfiguration.class));
-
-	@EnabledForJreRange(min = JRE.JAVA_21)
-	@Test
-	void shouldUseVirtualThreadsIfEnabled() {
-		this.contextRunner.withPropertyValues("spring.threads.virtual.enabled=true").run((context) -> {
-			assertThat(context).hasSingleBean(UndertowDeploymentInfoCustomizer.class);
-			assertThat(context).hasBean("virtualThreadsUndertowDeploymentInfoCustomizer");
-			UndertowDeploymentInfoCustomizer customizer = context.getBean(UndertowDeploymentInfoCustomizer.class);
-			DeploymentInfo deploymentInfo = new DeploymentInfo();
-			customizer.customize(deploymentInfo);
-			assertThat(deploymentInfo.getExecutor()).isInstanceOf(VirtualThreadTaskExecutor.class);
-		});
-	}
-
-}