Exclude beans with scheduled methods from global lazy init

This commit updates TaskSchedulingAutoConfiguration to contribute a
LazyInitializationExcludeFilter that processes beans that have
@Scheduled methods. This lets them be contributed to the context so
that scheduled methods are invoked as expected.

Closes gh-25315

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

+/*
+ * Copyright 2012-2021 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.task;
+
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ScheduledExecutorService;
+
+import org.springframework.aop.framework.AopInfrastructureBean;
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.boot.LazyInitializationExcludeFilter;
+import org.springframework.core.MethodIntrospector;
+import org.springframework.core.annotation.AnnotatedElementUtils;
+import org.springframework.core.annotation.AnnotationUtils;
+import org.springframework.scheduling.TaskScheduler;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.scheduling.annotation.Schedules;
+import org.springframework.util.ClassUtils;
+
+/**
+ * A {@link LazyInitializationExcludeFilter} that detects bean methods annotated with
+ * {@link Scheduled} or {@link Schedules}.
+ *
+ * @author Stephane Nicoll
+ */
+class ScheduledBeanLazyInitializationExcludeFilter implements LazyInitializationExcludeFilter {
+
+	private final Set<Class<?>> nonAnnotatedClasses = Collections.newSetFromMap(new ConcurrentHashMap<>(64));
+
+	ScheduledBeanLazyInitializationExcludeFilter() {
+		// Ignore AOP infrastructure such as scoped proxies.
+		this.nonAnnotatedClasses.add(AopInfrastructureBean.class);
+		this.nonAnnotatedClasses.add(TaskScheduler.class);
+		this.nonAnnotatedClasses.add(ScheduledExecutorService.class);
+	}
+
+	@Override
+	public boolean isExcluded(String beanName, BeanDefinition beanDefinition, Class<?> beanType) {
+		return hasScheduledTask(beanType);
+	}
+
+	private boolean hasScheduledTask(Class<?> type) {
+		Class<?> targetType = ClassUtils.getUserClass(type);
+		if (!this.nonAnnotatedClasses.contains(targetType)
+				&& AnnotationUtils.isCandidateClass(targetType, Arrays.asList(Scheduled.class, Schedules.class))) {
+			Map<Method, Set<Scheduled>> annotatedMethods = MethodIntrospector.selectMethods(targetType,
+					(MethodIntrospector.MetadataLookup<Set<Scheduled>>) (method) -> {
+						Set<Scheduled> scheduledAnnotations = AnnotatedElementUtils
+								.getMergedRepeatableAnnotations(method, Scheduled.class, Schedules.class);
+						return (!scheduledAnnotations.isEmpty() ? scheduledAnnotations : null);
+					});
+			if (annotatedMethods.isEmpty()) {
+				this.nonAnnotatedClasses.add(targetType);
+			}
+			return !annotatedMethods.isEmpty();
+		}
+		return false;
+	}
+
+}

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

@@ -19,6 +19,7 @@ package org.springframework.boot.autoconfigure.task;
 import java.util.concurrent.ScheduledExecutorService;
 
 import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.boot.LazyInitializationExcludeFilter;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
@@ -54,6 +55,11 @@ public class TaskSchedulingAutoConfiguration {
 		return builder.build();
 	}
 
+	@Bean
+	public static LazyInitializationExcludeFilter scheduledBeanLazyInitializationExcludeFilter() {
+		return new ScheduledBeanLazyInitializationExcludeFilter();
+	}
+
 	@Bean
 	@ConditionalOnMissingBean
 	public TaskSchedulerBuilder taskSchedulerBuilder(TaskSchedulingProperties properties,

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

+/*
+ * Copyright 2012-2021 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.task;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.scheduling.annotation.Schedules;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ScheduledBeanLazyInitializationExcludeFilter}.
+ *
+ * @author Stephane Nicoll
+ */
+class ScheduledBeanLazyInitializationExcludeFilterTests {
+
+	private final ScheduledBeanLazyInitializationExcludeFilter filter = new ScheduledBeanLazyInitializationExcludeFilter();
+
+	@Test
+	void beanWithScheduledMethodIsDetected() {
+		assertThat(isExcluded(TestBean.class)).isTrue();
+	}
+
+	@Test
+	void beanWithSchedulesMethodIsDetected() {
+		assertThat(isExcluded(AnotherTestBean.class)).isTrue();
+	}
+
+	@Test
+	void beanWithoutScheduledMethodIsDetected() {
+		assertThat(isExcluded(ScheduledBeanLazyInitializationExcludeFilterTests.class)).isFalse();
+	}
+
+	private boolean isExcluded(Class<?> type) {
+		return this.filter.isExcluded("test", new RootBeanDefinition(type), type);
+	}
+
+	private static class TestBean {
+
+		@Scheduled
+		void doStuff() {
+		}
+
+	}
+
+	private static class AnotherTestBean {
+
+		@Schedules({ @Scheduled(fixedRate = 5000), @Scheduled(fixedRate = 2500) })
+		void doStuff() {
+		}
+
+	}
+
+}

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

@@ -16,6 +16,9 @@
 
 package org.springframework.boot.autoconfigure.task;
 
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CountDownLatch;
@@ -23,8 +26,10 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
 
+import org.awaitility.Awaitility;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.LazyInitializationBeanFactoryPostProcessor;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.task.TaskSchedulerCustomizer;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
@@ -121,6 +126,22 @@ class TaskSchedulingAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	void enableSchedulingWithLazyInitializationInvokeScheduledMethods() {
+		List<String> threadNames = new ArrayList<>();
+		new ApplicationContextRunner()
+				.withInitializer((context) -> context
+						.addBeanFactoryPostProcessor(new LazyInitializationBeanFactoryPostProcessor()))
+				.withPropertyValues("spring.task.scheduling.thread-name-prefix=scheduling-test-")
+				.withBean(LazyTestBean.class, () -> new LazyTestBean(threadNames))
+				.withUserConfiguration(SchedulingConfiguration.class)
+				.withConfiguration(AutoConfigurations.of(TaskSchedulingAutoConfiguration.class)).run((context) -> {
+					// No lazy lookup.
+					Awaitility.waitAtMost(Duration.ofSeconds(3)).until(() -> !threadNames.isEmpty());
+					assertThat(threadNames).allMatch((name) -> name.contains("scheduling-test-"));
+				});
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	@EnableScheduling
 	static class SchedulingConfiguration {
@@ -193,6 +214,21 @@ class TaskSchedulingAutoConfigurationTests {
 
 	}
 
+	static class LazyTestBean {
+
+		private final List<String> threadNames;
+
+		LazyTestBean(List<String> threadNames) {
+			this.threadNames = threadNames;
+		}
+
+		@Scheduled(fixedRate = 2000)
+		void accumulate() {
+			this.threadNames.add(Thread.currentThread().getName());
+		}
+
+	}
+
 	static class TestTaskScheduler extends ThreadPoolTaskScheduler {
 
 		TestTaskScheduler() {