Introduce @EnableScheduling

org.springframework.context/src/main/java/org/springframework/scheduling/annotation/EnableScheduling.java

+/*
+ * Copyright 2002-2011 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
+ *
+ *      http://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.scheduling.annotation;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.context.annotation.Import;
+
+/**
+ * Enables Spring's scheduled task execution capability.
+ *
+ * @author Chris Beams
+ * @since 3.1
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+@Import(SchedulingConfiguration.class)
+@Documented
+public @interface EnableScheduling {
+
+}

org.springframework.context/src/main/java/org/springframework/scheduling/annotation/ScheduledAnnotationBeanPostProcessor.java

@@ -19,6 +19,7 @@ package org.springframework.scheduling.annotation;
 import java.lang.reflect.Method;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.ScheduledExecutorService;
 
 import org.springframework.aop.support.AopUtils;
 import org.springframework.beans.factory.DisposableBean;
@@ -30,6 +31,7 @@ import org.springframework.context.EmbeddedValueResolverAware;
 import org.springframework.context.event.ContextRefreshedEvent;
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.AnnotationUtils;
+import org.springframework.scheduling.TaskScheduler;
 import org.springframework.scheduling.config.ScheduledTaskRegistrar;
 import org.springframework.scheduling.support.ScheduledMethodRunnable;
 import org.springframework.util.Assert;
@@ -44,9 +46,12 @@ import org.springframework.util.StringValueResolver;
  *
  * @author Mark Fisher
  * @author Juergen Hoeller
+ * @author Chris Beams
  * @since 3.0
  * @see Scheduled
+ * @see SchedulingConfigurer
  * @see org.springframework.scheduling.TaskScheduler
+ * @see org.springframework.scheduling.config.ScheduledTaskRegistrar
  */
 public class ScheduledAnnotationBeanPostProcessor
 		implements BeanPostProcessor, Ordered, EmbeddedValueResolverAware, ApplicationContextAware,
@@ -58,7 +63,7 @@ public class ScheduledAnnotationBeanPostProcessor
 
 	private ApplicationContext applicationContext;
 
-	private final ScheduledTaskRegistrar registrar = new ScheduledTaskRegistrar();
+	private ScheduledTaskRegistrar registrar;
 
 	private final Map<Runnable, String> cronTasks = new HashMap<Runnable, String>();
 
@@ -134,15 +139,47 @@ public class ScheduledAnnotationBeanPostProcessor
 	}
 
 	public void onApplicationEvent(ContextRefreshedEvent event) {
-		if (event.getApplicationContext() == this.applicationContext) {
-			if (this.scheduler != null) {
-				this.registrar.setScheduler(this.scheduler);
+		if (event.getApplicationContext() != this.applicationContext) {
+			return;
+		}
+
+		Map<String, SchedulingConfigurer> configurers = applicationContext.getBeansOfType(SchedulingConfigurer.class);
+
+		if (this.cronTasks.isEmpty() && this.fixedDelayTasks.isEmpty() &&
+				this.fixedRateTasks.isEmpty() && configurers.isEmpty()) {
+			return;
+		}
+
+		this.registrar = new ScheduledTaskRegistrar();
+		this.registrar.setCronTasks(this.cronTasks);
+		this.registrar.setFixedDelayTasks(this.fixedDelayTasks);
+		this.registrar.setFixedRateTasks(this.fixedRateTasks);
+
+		if (this.scheduler != null) {
+			this.registrar.setScheduler(this.scheduler);
+		}
+
+		for (SchedulingConfigurer configurer : configurers.values()) {
+			configurer.configureTasks(this.registrar);
+		}
+
+		if (registrar.getScheduler() == null) {
+			Map<String, ? super Object> schedulers = new HashMap<String, Object>();
+			schedulers.putAll(applicationContext.getBeansOfType(TaskScheduler.class));
+			schedulers.putAll(applicationContext.getBeansOfType(ScheduledExecutorService.class));
+			if (schedulers.size() == 0) {
+				// do nothing -> fall back to default scheduler
+			} else if (schedulers.size() == 1) {
+				this.registrar.setScheduler(schedulers.values().iterator().next());
+			} else if (schedulers.size() >= 2){
+				throw new IllegalStateException("More than one TaskScheduler and/or ScheduledExecutorService  " +
+						"exist within the context. Remove all but one of the beans; or implement the " +
+						"SchedulingConfigurer interface and call ScheduledTaskRegistrar#setScheduler " +
+						"explicitly within the configureTasks() callback. Found the following beans: " + schedulers.keySet());
 			}
-			this.registrar.setCronTasks(this.cronTasks);
-			this.registrar.setFixedDelayTasks(this.fixedDelayTasks);
-			this.registrar.setFixedRateTasks(this.fixedRateTasks);
-			this.registrar.afterPropertiesSet();
 		}
+
+		this.registrar.afterPropertiesSet();
 	}
 
 	public void destroy() throws Exception {

org.springframework.context/src/main/java/org/springframework/scheduling/annotation/SchedulingConfiguration.java

+/*
+ * Copyright 2002-2011 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
+ *
+ *      http://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.scheduling.annotation;
+
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.context.annotation.AnnotationConfigUtils;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Role;
+
+@Configuration
+public class SchedulingConfiguration {
+
+	@Bean(name=AnnotationConfigUtils.SCHEDULED_ANNOTATION_PROCESSOR_BEAN_NAME)
+	@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
+	public ScheduledAnnotationBeanPostProcessor scheduledAnnotationProcessor() {
+		return new ScheduledAnnotationBeanPostProcessor();
+	}
+
+}

org.springframework.context/src/main/java/org/springframework/scheduling/annotation/SchedulingConfigurer.java

+/*
+ * Copyright 2002-2011 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
+ *
+ *      http://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.scheduling.annotation;
+
+import org.springframework.scheduling.config.ScheduledTaskRegistrar;
+
+public interface SchedulingConfigurer {
+
+	void configureTasks(ScheduledTaskRegistrar taskRegistrar);
+
+}

org.springframework.context/src/main/java/org/springframework/scheduling/config/ScheduledTaskRegistrar.java

 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -16,6 +16,7 @@
 
 package org.springframework.scheduling.config;
 
+import java.util.HashMap;
 import java.util.LinkedHashSet;
 import java.util.Map;
 import java.util.Set;
@@ -81,6 +82,13 @@ public class ScheduledTaskRegistrar implements InitializingBean, DisposableBean
 		}
 	}
 
+	/**
+	 * Return the scheduler instance for this registrar (may be null)
+	 */
+	public TaskScheduler getScheduler() {
+		return this.taskScheduler;
+	}
+
 	/**
 	 * Specify triggered tasks as a Map of Runnables (the tasks) and Trigger objects
 	 * (typically custom implementations of the {@link Trigger} interface).
@@ -105,6 +113,49 @@ public class ScheduledTaskRegistrar implements InitializingBean, DisposableBean
 		this.fixedRateTasks = fixedRateTasks;
 	}
 
+	/**
+	 * Add a Runnable task to be triggered per the given {@link Trigger}.
+	 * @see TaskScheduler#scheduleAtFixedRate(Runnable, long)
+	 */
+	public void addTriggerTask(Runnable task, Trigger trigger) {
+		if (this.triggerTasks == null) {
+			this.triggerTasks = new HashMap<Runnable, Trigger>();
+		}
+		this.triggerTasks.put(task, trigger);
+	}
+
+	/**
+	 * Add a Runnable task to be triggered per the given cron expression
+	 */
+	public void addCronTask(Runnable task, String cronExpression) {
+		if (this.cronTasks == null) {
+			this.cronTasks = new HashMap<Runnable, String>();
+		}
+		this.cronTasks.put(task, cronExpression);
+	}
+
+	/**
+	 * Add a Runnable task to be triggered with the given fixed delay.
+	 * @see TaskScheduler#scheduleWithFixedDelay(Runnable, long)
+	 */
+	public void addFixedDelayTask(Runnable task, long delay) {
+		if (this.fixedDelayTasks == null) {
+			this.fixedDelayTasks = new HashMap<Runnable, Long>();
+		}
+		this.fixedDelayTasks.put(task, delay);
+	}
+
+	/**
+	 * Add a Runnable task to be triggered at the given fixed-rate period.
+	 * @see TaskScheduler#scheduleAtFixedRate(Runnable, long)
+	 */
+	public void addFixedRateTask(Runnable task, long period) {
+		if (this.fixedRateTasks == null) {
+			this.fixedRateTasks = new HashMap<Runnable, Long>();
+		}
+		this.fixedRateTasks.put(task, period);
+	}
+
 	/**
 	 * Specify triggered tasks as a Map of Runnables (the tasks) and fixed-delay values.
 	 * @see TaskScheduler#scheduleWithFixedDelay(Runnable, long)

org.springframework.context/src/test/java/org/springframework/scheduling/annotation/EnableSchedulingTests.java

+/*
+ * Copyright 2002-2011 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
+ *
+ *      http://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.scheduling.annotation;
+
+import static org.hamcrest.Matchers.greaterThan;
+import static org.hamcrest.Matchers.greaterThanOrEqualTo;
+import static org.hamcrest.Matchers.startsWith;
+import static org.junit.Assert.assertThat;
+
+import java.util.Date;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.junit.Test;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.TaskScheduler;
+import org.springframework.scheduling.Trigger;
+import org.springframework.scheduling.TriggerContext;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
+import org.springframework.scheduling.config.ScheduledTaskRegistrar;
+
+/**
+ * Tests use of @EnableScheduling on @Configuration classes.
+ *
+ * @author Chris Beams
+ * @since 3.1
+ */
+public class EnableSchedulingTests {
+
+	@Test
+	public void withFixedRateTask() throws InterruptedException {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(FixedRateTaskConfig.class);
+		ctx.refresh();
+
+		Thread.sleep(100);
+		assertThat(ctx.getBean(AtomicInteger.class).get(), greaterThanOrEqualTo(10));
+		ctx.close();
+	}
+
+
+	@EnableScheduling @Configuration
+	static class FixedRateTaskConfig {
+
+		@Bean
+		public AtomicInteger counter() {
+			return new AtomicInteger();
+		}
+
+		@Scheduled(fixedRate=10)
+		public void task() {
+			counter().incrementAndGet();
+		}
+	}
+
+
+	@Test
+	public void withSubclass() throws InterruptedException {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(FixedRateTaskConfigSubclass.class);
+		ctx.refresh();
+
+		Thread.sleep(100);
+		assertThat(ctx.getBean(AtomicInteger.class).get(), greaterThanOrEqualTo(10));
+		ctx.close();
+	}
+
+
+	@Configuration
+	static class FixedRateTaskConfigSubclass extends FixedRateTaskConfig {
+	}
+
+
+	@Test
+	public void withExplicitScheduler() throws InterruptedException {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(ExplicitSchedulerConfig.class);
+		ctx.refresh();
+
+		Thread.sleep(100);
+		assertThat(ctx.getBean(AtomicInteger.class).get(), greaterThanOrEqualTo(10));
+		assertThat(ctx.getBean(ExplicitSchedulerConfig.class).threadName, startsWith("explicitScheduler-"));
+		ctx.close();
+	}
+
+
+	@EnableScheduling @Configuration
+	static class ExplicitSchedulerConfig {
+
+		String threadName;
+
+		@Bean
+		public TaskScheduler taskScheduler() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler-");
+			return scheduler;
+		}
+
+		@Bean
+		public AtomicInteger counter() {
+			return new AtomicInteger();
+		}
+
+		@Scheduled(fixedRate=10)
+		public void task() {
+			threadName = Thread.currentThread().getName();
+			counter().incrementAndGet();
+		}
+	}
+
+
+	@Test(expected=IllegalStateException.class)
+	public void withExplicitSchedulerAmbiguity_andSchedulingEnabled() {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(AmbiguousExplicitSchedulerConfig.class);
+		try {
+			ctx.refresh();
+		} catch (IllegalStateException ex) {
+			assertThat(ex.getMessage(), startsWith("More than one TaskScheduler"));
+			throw ex;
+		}
+	}
+
+	@EnableScheduling @Configuration
+	static class AmbiguousExplicitSchedulerConfig {
+
+		String threadName;
+
+		@Bean
+		public TaskScheduler taskScheduler1() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler1");
+			return scheduler;
+		}
+
+		@Bean
+		public TaskScheduler taskScheduler2() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler2");
+			return scheduler;
+		}
+
+		@Bean
+		public AtomicInteger counter() {
+			return new AtomicInteger();
+		}
+
+		@Scheduled(fixedRate=10)
+		public void task() {
+			threadName = Thread.currentThread().getName();
+			counter().incrementAndGet();
+		}
+	}
+
+
+	@Test
+	public void withExplicitScheduledTaskRegistrar() throws InterruptedException {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(ExplicitScheduledTaskRegistrarConfig.class);
+		ctx.refresh();
+
+		Thread.sleep(100);
+		assertThat(ctx.getBean(AtomicInteger.class).get(), greaterThanOrEqualTo(10));
+		assertThat(ctx.getBean(ExplicitScheduledTaskRegistrarConfig.class).threadName, startsWith("explicitScheduler1"));
+		ctx.close();
+	}
+
+
+	@EnableScheduling @Configuration
+	static class ExplicitScheduledTaskRegistrarConfig implements SchedulingConfigurer {
+
+		String threadName;
+
+		@Bean
+		public TaskScheduler taskScheduler1() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler1");
+			return scheduler;
+		}
+
+		@Bean
+		public TaskScheduler taskScheduler2() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler2");
+			return scheduler;
+		}
+
+		@Bean
+		public AtomicInteger counter() {
+			return new AtomicInteger();
+		}
+
+		@Scheduled(fixedRate=10)
+		public void task() {
+			threadName = Thread.currentThread().getName();
+			counter().incrementAndGet();
+		}
+
+		public Object getScheduler() {
+			return null;
+		}
+
+		public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
+			taskRegistrar.setScheduler(taskScheduler1());
+		}
+
+	}
+
+
+	@Test
+	public void withAmbiguousTaskSchedulers_butNoActualTasks() {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(SchedulingEnabled_withAmbiguousTaskSchedulers_butNoActualTasks.class);
+		ctx.refresh();
+	}
+
+
+	@Configuration
+	@EnableScheduling
+	static class SchedulingEnabled_withAmbiguousTaskSchedulers_butNoActualTasks {
+
+		@Bean
+		public TaskScheduler taskScheduler1() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler1");
+			return scheduler;
+		}
+
+		@Bean
+		public TaskScheduler taskScheduler2() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler2");
+			return scheduler;
+		}
+	}
+
+
+	@Test(expected=IllegalStateException.class)
+	public void withAmbiguousTaskSchedulers_andSingleTask() {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(SchedulingEnabled_withAmbiguousTaskSchedulers_andSingleTask.class);
+		try {
+			ctx.refresh();
+		} catch (IllegalStateException ex) {
+			assertThat(ex.getMessage(), startsWith("More than one TaskScheduler and/or"));
+			throw ex;
+		}
+	}
+
+
+	@Configuration
+	@EnableScheduling
+	static class SchedulingEnabled_withAmbiguousTaskSchedulers_andSingleTask {
+
+		@Scheduled(fixedRate=10L)
+		public void task() {
+		}
+
+		@Bean
+		public TaskScheduler taskScheduler1() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler1");
+			return scheduler;
+		}
+
+		@Bean
+		public TaskScheduler taskScheduler2() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler2");
+			return scheduler;
+		}
+	}
+
+	@Test
+	public void withAmbiguousTaskSchedulers_andSingleTask_disambiguatedByScheduledTaskRegistrarBean() throws InterruptedException {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(SchedulingEnabled_withAmbiguousTaskSchedulers_andSingleTask_disambiguatedByScheduledTaskRegistrar.class);
+		ctx.refresh();
+		Thread.sleep(20);
+		ThreadAwareWorker worker = ctx.getBean(ThreadAwareWorker.class);
+		ctx.close();
+		assertThat(worker.executedByThread, startsWith("explicitScheduler2-"));
+	}
+
+
+	static class ThreadAwareWorker {
+		String executedByThread;
+	}
+
+
+	@Configuration
+	@EnableScheduling
+	static class SchedulingEnabled_withAmbiguousTaskSchedulers_andSingleTask_disambiguatedByScheduledTaskRegistrar implements SchedulingConfigurer {
+
+		@Scheduled(fixedRate=10)
+		public void task() {
+			worker().executedByThread = Thread.currentThread().getName();
+		}
+
+		@Bean
+		public ThreadAwareWorker worker() {
+			return new ThreadAwareWorker();
+		}
+
+		public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
+			taskRegistrar.setScheduler(taskScheduler2());
+		}
+
+		@Bean
+		public TaskScheduler taskScheduler1() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler1-");
+			return scheduler;
+		}
+
+		@Bean
+		public TaskScheduler taskScheduler2() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler2-");
+			return scheduler;
+		}
+	}
+
+
+	@Test
+	public void withAmbiguousTaskSchedulers_andSingleTask_disambiguatedBySchedulerNameAttribute() throws InterruptedException {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(SchedulingEnabled_withAmbiguousTaskSchedulers_andSingleTask_disambiguatedBySchedulerNameAttribute.class);
+		ctx.refresh();
+		Thread.sleep(20);
+		ThreadAwareWorker worker = ctx.getBean(ThreadAwareWorker.class);
+		ctx.close();
+		assertThat(worker.executedByThread, startsWith("explicitScheduler2-"));
+	}
+
+
+	@Configuration
+	@EnableScheduling
+	static class SchedulingEnabled_withAmbiguousTaskSchedulers_andSingleTask_disambiguatedBySchedulerNameAttribute implements SchedulingConfigurer {
+
+		@Scheduled(fixedRate=10)
+		public void task() {
+			worker().executedByThread = Thread.currentThread().getName();
+		}
+
+		@Bean
+		public ThreadAwareWorker worker() {
+			return new ThreadAwareWorker();
+		}
+
+		@Bean
+		public TaskScheduler taskScheduler1() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler1-");
+			return scheduler;
+		}
+
+		@Bean
+		public TaskScheduler taskScheduler2() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.setThreadNamePrefix("explicitScheduler2-");
+			return scheduler;
+		}
+
+		public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
+			taskRegistrar.setScheduler(taskScheduler2());
+		}
+	}
+
+
+	@Test
+	public void withTriggerTask() throws InterruptedException {
+		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
+		ctx.register(TriggerTaskConfig.class);
+		ctx.refresh();
+
+		Thread.sleep(100);
+		assertThat(ctx.getBean(AtomicInteger.class).get(), greaterThan(1));
+		ctx.close();
+	}
+
+
+	@Configuration
+	static class TriggerTaskConfig {
+
+		@Bean
+		public AtomicInteger counter() {
+			return new AtomicInteger();
+		}
+
+		@Bean
+		public TaskScheduler scheduler() {
+			ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
+			scheduler.initialize();
+			scheduler.schedule(
+				new Runnable() {
+					public void run() {
+						counter().incrementAndGet();
+					}
+				},
+				new Trigger() {
+					public Date nextExecutionTime(TriggerContext triggerContext) {
+						return new Date(new Date().getTime()+10);
+					}
+				});
+			return scheduler;
+		}
+	}
+}