Force lazy-init to false when parsing scheduled:task

A <scheduled:task> element declared within a
<beans default-lazy-init="true"> element represents a contradiction in
terms: such a task will never be executed.

For this reason, we now override any inherited lazy-init settings
when parsing <scheduled:task> elements, forcing lazy-init to false
for the underlying ScheduledTaskRegistrar bean.

Thanks to Mike Youngstrom for contributing an initial patch.

Issue: SPR-8498

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

@@ -50,6 +50,7 @@ public class ScheduledTasksBeanDefinitionParser extends AbstractSingleBeanDefini
 
 	@Override
 	protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
+		builder.setLazyInit(false); // lazy scheduled tasks are a contradiction in terms -> force to false
 		ManagedMap<RuntimeBeanReference, String> cronTaskMap = new ManagedMap<RuntimeBeanReference, String>();
 		ManagedMap<RuntimeBeanReference, String> fixedDelayTaskMap = new ManagedMap<RuntimeBeanReference, String>();
 		ManagedMap<RuntimeBeanReference, String> fixedRateTaskMap = new ManagedMap<RuntimeBeanReference, String>();

org.springframework.context/src/test/java/org/springframework/scheduling/config/LazyScheduledTasksBeanDefinitionParserTests.java

@@ -0,0 +1,54 @@
+/*
+ * 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.config;
+
+import org.junit.Test;
+import org.springframework.context.support.GenericXmlApplicationContext;
+
+/**
+ * Tests ensuring that tasks scheduled using the <task:scheduled> element
+ * are never marked lazy, even if the enclosing <beans> element declares
+ * default-lazy-init="true". See  SPR-8498
+ *
+ * @author Mike Youngstrom
+ * @author Chris Beams
+ */
+public class LazyScheduledTasksBeanDefinitionParserTests {
+
+	@Test(timeout = 5000)
+	public void checkTarget() {
+		Task task =
+			new GenericXmlApplicationContext(
+					LazyScheduledTasksBeanDefinitionParserTests.class,
+					"lazyScheduledTasksContext.xml")
+				.getBean(Task.class);
+
+		while (!task.executed) {
+			try {
+				Thread.sleep(10);
+			} catch (Exception e) { /* Do Nothing */ }
+		}
+	}
+
+	static class Task {
+		volatile boolean executed = false;
+
+		public void doWork() {
+			executed = true;
+		}
+	}
+}

org.springframework.context/src/test/resources/org/springframework/scheduling/config/lazyScheduledTasksContext.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		xmlns:task="http://www.springframework.org/schema/task"
+		xsi:schemaLocation="
+			http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
+			http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd"
+		default-lazy-init="true">
+
+	<task:scheduled-tasks>
+		<task:scheduled ref="myTask" method="doWork" fixed-rate="10"/>
+	</task:scheduled-tasks>
+
+	<bean id="myTask" class="org.springframework.scheduling.config.LazyScheduledTasksBeanDefinitionParserTests$Task"/>
+</beans>