Java 为什么@Scheduled和<；任务：已计划../>；在Spring 3.1中，依赖项注入的行为会有所不同吗？

我需要使用Spring3.1计划一个任务。 我将Roo与ActiveRecord模式一起用于实体

在专用服务bean中，要调度的方法非常简单：

public void sessionCleanup() {
    featureSessionManager.sessionCleanup();
}

…配置为：

<bean id="scheduledTaskService" class="it.blablabla.ScheduledTaskService">
    [...dependencies...]
</bean>

…应用程序在初始化时引发异常

2012-07-24 12:26:56,293 [pool-2-thread-1] INFO  org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler - Initializing ExecutorService  'scheduler'
2012-07-24 12:26:56,671 [scheduler-1] ERROR org.springframework.scheduling.support.TaskUtils$LoggingErrorHandler - Unexpected error occurred in scheduled task.
java.lang.IllegalStateException: Entity manager has not been injected (is the Spring Aspects JAR configured as an AJC/AJDT aspects library?)
    at it.blablabla.model.AbstractFeatureSession_Roo_Jpa_ActiveRecord.entityManager_aroundBody0(AbstractFeatureSession_Roo_Jpa_ActiveRecord.aj:38)
    at it.blablabla.model.AbstractFeatureSession_Roo_Jpa_ActiveRecord.ajc$interMethod$it.blablabla_model_AbstractFeatureSession_Roo_Jpa_ActiveRecord$it.blablabla_model_AbstractFeatureSession$entityManager(AbstractFeatureSession_Roo_Jpa_ActiveRecord.aj:1)
    at it.blablabla.model.AbstractFeatureSession.entityManager(AbstractFeatureSession.java:1)
    at it.blablabla.model.AbstractFeatureSession_Roo_Jpa_ActiveRecord.ajc$interMethodDispatch1$it.blablabla_model_AbstractFeatureSession_Roo_Jpa_ActiveRecord$it.blablabla_model_AbstractFeatureSession$entityManager(AbstractFeatureSession_Roo_Jpa_ActiveRecord.aj)
    at it.blablabla.model.FeatureSession.updateAsDroppedAllExpiredAndNotDropped_aroundBody10(FeatureSession.java:245)
    at it.blablabla.model.FeatureSession.updateAsDroppedAllExpiredAndNotDropped(FeatureSession.java:1)
    at it.blablabla.service.FeatureSessionManagementServiceImpl.dropExpiredSessions(FeatureSessionManagementServiceImpl.java:154)
    at it.blablabla.service.FeatureSessionManagementServiceImpl.sessionCleanup(FeatureSessionManagementServiceImpl.java:178)
    at it.blablabla.task.ScheduledTaskWorker.sessionCleanup(ScheduledTaskWorker.java:37)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:64)
    at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:53)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

显然，它无法将EntityManager注入到任务实例化的实体中。 （Roo的ActiveRecords是可配置的，EntityManager在创建实例时被注入）

---

这在Tomcat或JUnit中都会发生。

显然这是bean初始化顺序的问题。这似乎很相似，也许移动调度程序声明在应用程序上下文中的位置会有所帮助？

2012-07-24 12:26:56,293 [pool-2-thread-1] INFO  org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler - Initializing ExecutorService  'scheduler'
2012-07-24 12:26:56,671 [scheduler-1] ERROR org.springframework.scheduling.support.TaskUtils$LoggingErrorHandler - Unexpected error occurred in scheduled task.
java.lang.IllegalStateException: Entity manager has not been injected (is the Spring Aspects JAR configured as an AJC/AJDT aspects library?)
    at it.blablabla.model.AbstractFeatureSession_Roo_Jpa_ActiveRecord.entityManager_aroundBody0(AbstractFeatureSession_Roo_Jpa_ActiveRecord.aj:38)
    at it.blablabla.model.AbstractFeatureSession_Roo_Jpa_ActiveRecord.ajc$interMethod$it.blablabla_model_AbstractFeatureSession_Roo_Jpa_ActiveRecord$it.blablabla_model_AbstractFeatureSession$entityManager(AbstractFeatureSession_Roo_Jpa_ActiveRecord.aj:1)
    at it.blablabla.model.AbstractFeatureSession.entityManager(AbstractFeatureSession.java:1)
    at it.blablabla.model.AbstractFeatureSession_Roo_Jpa_ActiveRecord.ajc$interMethodDispatch1$it.blablabla_model_AbstractFeatureSession_Roo_Jpa_ActiveRecord$it.blablabla_model_AbstractFeatureSession$entityManager(AbstractFeatureSession_Roo_Jpa_ActiveRecord.aj)
    at it.blablabla.model.FeatureSession.updateAsDroppedAllExpiredAndNotDropped_aroundBody10(FeatureSession.java:245)
    at it.blablabla.model.FeatureSession.updateAsDroppedAllExpiredAndNotDropped(FeatureSession.java:1)
    at it.blablabla.service.FeatureSessionManagementServiceImpl.dropExpiredSessions(FeatureSessionManagementServiceImpl.java:154)
    at it.blablabla.service.FeatureSessionManagementServiceImpl.sessionCleanup(FeatureSessionManagementServiceImpl.java:178)
    at it.blablabla.task.ScheduledTaskWorker.sessionCleanup(ScheduledTaskWorker.java:37)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:64)
    at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:53)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)