Make AnnotatedControllerConfigurer use applicationTaskExecutor

Closes gh-36388

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/graphql/GraphQlAutoConfiguration.java

@@ -21,6 +21,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.concurrent.Executor;
 
 import graphql.GraphQL;
 import graphql.execution.instrumentation.Instrumentation;
@@ -33,10 +34,12 @@ import org.springframework.aot.hint.RuntimeHints;
 import org.springframework.aot.hint.RuntimeHintsRegistrar;
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.boot.convert.ApplicationConversionService;
 import org.springframework.context.annotation.Bean;
@@ -152,10 +155,12 @@ public class GraphQlAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
-	public AnnotatedControllerConfigurer annotatedControllerConfigurer() {
+	public AnnotatedControllerConfigurer annotatedControllerConfigurer(
+			@Qualifier(TaskExecutionAutoConfiguration.APPLICATION_TASK_EXECUTOR_BEAN_NAME) ObjectProvider<Executor> executorProvider) {
 		AnnotatedControllerConfigurer controllerConfigurer = new AnnotatedControllerConfigurer();
 		controllerConfigurer
 			.addFormatterRegistrar((registry) -> ApplicationConversionService.addBeans(registry, this.beanFactory));
+		executorProvider.ifAvailable(controllerConfigurer::setExecutor);
 		return controllerConfigurer;
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/graphql/GraphQlAutoConfigurationTests.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.autoconfigure.graphql;
 
 import java.nio.charset.StandardCharsets;
+import java.util.concurrent.Executor;
 
 import graphql.GraphQL;
 import graphql.execution.instrumentation.ChainedInstrumentation;
@@ -34,6 +35,7 @@ import org.springframework.aot.hint.RuntimeHints;
 import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.graphql.GraphQlAutoConfiguration.GraphQlResourcesRuntimeHints;
+import org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -209,6 +211,26 @@ class GraphQlAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void whenApplicationTaskExecutorIsDefinedThenAnnotatedControllerConfigurerShouldUseIt() {
+		this.contextRunner.withConfiguration(AutoConfigurations.of(TaskExecutionAutoConfiguration.class))
+			.run((context) -> {
+				AnnotatedControllerConfigurer annotatedControllerConfigurer = context
+					.getBean(AnnotatedControllerConfigurer.class);
+				assertThat(annotatedControllerConfigurer).extracting("executor")
+					.isSameAs(context.getBean("applicationTaskExecutor"));
+			});
+	}
+
+	@Test
+	void whenCustomExecutorIsDefinedThenAnnotatedControllerConfigurerDoesNotUseIt() {
+		this.contextRunner.withUserConfiguration(CustomExecutorConfiguration.class).run((context) -> {
+			AnnotatedControllerConfigurer annotatedControllerConfigurer = context
+				.getBean(AnnotatedControllerConfigurer.class);
+			assertThat(annotatedControllerConfigurer).extracting("executor").isNull();
+		});
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class CustomGraphQlBuilderConfiguration {
 
@@ -294,4 +316,14 @@ class GraphQlAutoConfigurationTests {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	static class CustomExecutorConfiguration {
+
+		@Bean
+		Executor customExecutor() {
+			return mock(Executor.class);
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-docs/src/docs/asciidoc/features/task-execution-and-scheduling.adoc

@@ -3,11 +3,17 @@
 In the absence of an `Executor` bean in the context, Spring Boot auto-configures an `AsyncTaskExecutor`.
 When virtual threads are enabled (using Java 21+ and configprop:spring.threads.virtual.enabled[] set to `true`) this will be a `SimpleAsyncTaskExecutor` that uses virtual threads.
 Otherwise, it will be a `ThreadPoolTaskExecutor` with sensible defaults.
-In either case, the auto-configured executor will be automatically used for asynchronous task execution (`@EnableAsync`), Spring MVC asynchronous request processing, and Spring WebFlux blocking execution.
+In either case, the auto-configured executor will be automatically used for:
+
+- asynchronous task execution (`@EnableAsync`)
+- Spring for GraphQL's asynchronous handling of `Callable` return values from controller methods
+- Spring MVC's asynchronous request processing
+- Spring WebFlux's blocking execution support
 
 [TIP]
 ====
-If you have defined a custom `Executor` in the context, regular task execution (that is `@EnableAsync`) will use it transparently but the Spring MVC and Spring WebFlux support will not be configured as they require an `AsyncTaskExecutor` implementation (named `applicationTaskExecutor`).
+If you have defined a custom `Executor` in the context, both regular task execution (that is `@EnableAsync`) and Spring for GraphQL will use it.
+However, the Spring MVC and Spring WebFlux support will only use it if it is an `AsyncTaskExecutor` implementation (named `applicationTaskExecutor`).
 Depending on your target arrangement, you could change your `Executor` into an `AsyncTaskExecutor` or define both an `AsyncTaskExecutor` and an `AsyncConfigurer` wrapping your custom `Executor`.
 
 The auto-configured `TaskExecutorBuilder` allows you to easily create instances that reproduce what the auto-configuration does by default.