Merge pull request #14934 from Artsiom Yudovin

* gh-14934:
  Polish "Make auto-configured applicationTaskExecutor bean lazy"
  Make auto-configured applicationTaskExecutor bean lazy

Author: wilkinsona

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/task/TaskExecutionAutoConfiguration.java

@@ -27,6 +27,7 @@
 import org.springframework.boot.task.TaskExecutorCustomizer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Lazy;
 import org.springframework.core.task.TaskDecorator;
 import org.springframework.core.task.TaskExecutor;
 import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
@@ -77,6 +78,7 @@ public TaskExecutorBuilder taskExecutorBuilder() {
 		return builder;
 	}
 
+	@Lazy
 	@Bean(name = APPLICATION_TASK_EXECUTOR_BEAN_NAME)
 	@ConditionalOnMissingBean(Executor.class)
 	public ThreadPoolTaskExecutor applicationTaskExecutor(TaskExecutorBuilder builder) {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/task/TaskExecutionAutoConfigurationTests.java

@@ -20,6 +20,7 @@
 import java.util.concurrent.Future;
 import java.util.function.Consumer;
 
+import org.junit.Rule;
 import org.junit.Test;
 
 import org.springframework.beans.DirectFieldAccessor;
@@ -29,6 +30,7 @@
 import org.springframework.boot.test.context.assertj.AssertableApplicationContext;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.boot.test.context.runner.ContextConsumer;
+import org.springframework.boot.test.rule.OutputCapture;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.task.SyncTaskExecutor;
@@ -55,6 +57,9 @@ public class TaskExecutionAutoConfigurationTests {
 			.withConfiguration(
 					AutoConfigurations.of(TaskExecutionAutoConfiguration.class));
 
+	@Rule
+	public final OutputCapture output = new OutputCapture();
+
 	@Test
 	public void taskExecutorBuilderShouldApplyCustomSettings() {
 		this.contextRunner
@@ -101,11 +106,15 @@ public void taskExecutorBuilderShouldUseTaskDecorator() {
 
 	@Test
 	public void taskExecutorAutoConfigured() {
+		this.output.reset();
 		this.contextRunner.run((context) -> {
+			assertThat(this.output.toString())
+					.doesNotContain("Initializing ExecutorService");
 			assertThat(context).hasSingleBean(Executor.class);
 			assertThat(context).hasBean("applicationTaskExecutor");
 			assertThat(context).getBean("applicationTaskExecutor")
 					.isInstanceOf(ThreadPoolTaskExecutor.class);
+			assertThat(this.output.toString()).contains("Initializing ExecutorService");
 		});
 	}