Java EE单例计划任务执行两次
我想在预定时间执行两项任务(CET 23:59和08:00)。我创建了一个EJB单例bean来维护这些方法:Java EE单例计划任务执行两次,java,jakarta-ee,design-patterns,jboss,singleton,Java,Jakarta Ee,Design Patterns,Jboss,Singleton,我想在预定时间执行两项任务(CET 23:59和08:00)。我创建了一个EJB单例bean来维护这些方法: @Singleton public class OfferManager { @Schedule(hour = "23", minute = "59", timezone = "CET") @AccessTimeout(value = 0) // concurrent access is not permitted public void fetchNewOff
@Singleton
public class OfferManager {
@Schedule(hour = "23", minute = "59", timezone = "CET")
@AccessTimeout(value = 0) // concurrent access is not permitted
public void fetchNewOffers() {
Logger.getLogger(OfferManager.class.getName()).log(Level.INFO, "Fetching new offers started");
// ...
Logger.getLogger(OfferManager.class.getName()).log(Level.INFO, "Fetching new offers finished");
}
@Schedule(hour="8", minute = "0", timezone = "CET")
public void sendMailsWithReports() {
Logger.getLogger(OfferManager.class.getName()).log(Level.INFO, "Generating reports started");
// ...
Logger.getLogger(OfferManager.class.getName()).log(Level.INFO, "Generating reports finished");
}
}
问题是两个任务都执行了两次。服务器为WildFly Beta1,以UTC时间配置
以下是一些可能有用的服务器日志:
2013-10-20 11:15:17,684 INFO [org.jboss.as.server] (XNIO-1 task-7) JBAS018559: Deployed "crawler-0.3.war" (runtime-name : "crawler-0.3.war")
2013-10-20 21:59:00,070 INFO [com.indeed.control.OfferManager] (EJB default - 1) Fetching new offers started
....
2013-10-20 22:03:48,608 INFO [com.indeed.control.OfferManager] (EJB default - 1) Fetching new offers finished
2013-10-20 23:59:00,009 INFO [com.indeed.control.OfferManager] (EJB default - 2) Fetching new offers started
....
2013-10-20 23:59:22,279 INFO [com.indeed.control.OfferManager] (EJB default - 2) Fetching new offers finished
这种行为的原因可能是什么?我通过使用服务器时间(UTC)指定计划时间解决了这个问题。 所以 替换为:
@Schedule(hour = "21", minute = "59")
我不知道这种行为的原因,可能是Wildfly的早期发布造成的。我对TomEE plume 7.0.4也有同样的问题。在我的案例中,解决方案是将
@Singleton
更改为@Stateless
检查是否有任何其他@Schedule
可以在21:59:00运行。此时不应运行您显示的代码。这些是使用@Schedule
注释的唯一方法。第二个方法也将执行两次。计划时间前2小时一次,之后正确
@Schedule(hour = "21", minute = "59")