Update documentation for Task Execution

See gh-44926

Signed-off-by: Dmytro Nosan <dimanosan@gmail.com>

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/features/taskexecutionandscheduling/TaskExecutionConfigurationExamples.java

@@ -0,0 +1,98 @@
+/*
+ * Copyright 2012-2025 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.docs.features.taskexecutionandscheduling;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.task.SimpleAsyncTaskExecutorBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.task.SimpleAsyncTaskExecutor;
+import org.springframework.scheduling.annotation.AsyncConfigurer;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
+
+public class TaskExecutionConfigurationExamples {
+
+	// tag::default-candidate-task-executor[]
+	@Bean(defaultCandidate = false)
+	@Qualifier("scheduledExecutorService")
+	ScheduledExecutorService scheduledExecutorService() {
+		return Executors.newSingleThreadScheduledExecutor();
+	}
+	// end::default-candidate-task-executor[]
+
+	// tag::application-task-executor[]
+	@Bean("applicationTaskExecutor")
+	SimpleAsyncTaskExecutor applicationTaskExecutor() {
+		return new SimpleAsyncTaskExecutor("app-");
+	}
+	// end::application-task-executor[]
+
+	// tag::executor-builder[]
+	@Bean
+	SimpleAsyncTaskExecutor taskExecutor(SimpleAsyncTaskExecutorBuilder builder) {
+		return builder.build();
+	}
+	// end::executor-builder[]
+
+	static class MultipleTaskExecutor {
+
+		// tag::multiple-task-executor[]
+		@Bean("applicationTaskExecutor")
+		SimpleAsyncTaskExecutor applicationTaskExecutor() {
+			return new SimpleAsyncTaskExecutor("app-");
+		}
+
+		@Bean("taskExecutor")
+		ThreadPoolTaskExecutor taskExecutor() {
+			ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
+			threadPoolTaskExecutor.setThreadNamePrefix("async-");
+			return threadPoolTaskExecutor;
+		}
+		// end::multiple-task-executor[]
+
+	}
+
+	// tag::async-configurer[]
+	@Configuration(proxyBeanMethods = false)
+	public class TaskExecutionConfiguration {
+
+		@Bean
+		AsyncConfigurer asyncConfigurer(ExecutorService executorService) {
+			return new AsyncConfigurer() {
+
+				@Override
+				public Executor getAsyncExecutor() {
+					return executorService;
+				}
+
+			};
+		}
+
+		@Bean
+		ExecutorService executorService() {
+			return Executors.newCachedThreadPool();
+		}
+
+	}
+	// end::async-configurer[]
+
+}