Java 如何确保只执行EJB计时器服务的一个线程

我正在尝试将我的简单Quartz作业转换为JBOSS EAP 6.4中的EJB计时器服务作业

我有一个问题，我还没有找到一个好的答案。我希望每天凌晨1点运行此方法一次

这是我的课

@Singleton
@Startup
public class JobExecutorService {

    @Schedule(second = "*", minute = "*", hour = "1",persistent = false)
    public void scheduleJobs() throws InterruptedException {
        new ClinicalTrialsDataExtractor().execute();
    }
}

我在控制台中收到以下错误：

16:51:20,002 WARN  [org.jboss.as.ejb3] (EJB default - 3) JBAS014143: A previous execution of timer [clinicalTrials.clinicalTrials.JobExecutorService ed420447-56b0-4d27-9533-f77e8a80ffbb] is still in progress, skipping this overlapping scheduled execution at: Tue Feb 23 16:51:20 EST 2016 as timer state is IN_TIMEOUT
16:51:21,004 WARN  [org.jboss.as.ejb3] (EJB default - 4) JBAS014143: A previous execution of timer [clinicalTrials.clinicalTrials.JobExecutorService ed420447-56b0-4d27-9533-f77e8a80ffbb] is still in progress, skipping this overlapping scheduled execution at: Tue Feb 23 16:51:21 EST 2016 as timer state is IN_TIMEOUT
16:51:22,005 WARN  [org.jboss.as.ejb3] (EJB default - 5) JBAS014143: A previous execution of timer [clinicalTrials.clinicalTrials.JobExecutorService ed420447-56b0-4d27-9533-f77e8a80ffbb] is still in progress, skipping this overlapping scheduled execution at: Tue Feb 23 16:51:22 EST 2016 as timer state is IN_TIMEOUT
16:51:23,004 WARN  [org.jboss.as.ejb3] (EJB default - 6) JBAS014143: A previous execution of timer [clinicalTrials.clinicalTrials.JobExecutorService ed420447-56b0-4d27-9533-f77e8a80ffbb] is still in progress, skipping this overlapping scheduled execution at: Tue Feb 23 16:51:23 EST 2016 as timer state is IN_TIMEOUT
16:51:24,002 WARN  [org.jboss.as.ejb3] (EJB default - 7) JBAS014143: A previous execution of timer [clinicalTrials.clinicalTrials.JobExecutorService ed420447-56b0-4d27-9533-f77e8a80ffbb] is still in progress, skipping this overlapping scheduled execution at: Tue Feb 23 16:51:24 EST 2016 as timer state is IN_TIMEOUT

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防止这些线程尝试旋转的最简单方法是什么？

我很惊讶没有人回答这个相对简单的问题。问题归结为@Schedule注释中的错误。该方法试图每秒钟触发一次，因此*。正确的方法是：

@Schedule(second = "0", minute = "0", hour = "1",persistent = false)
public void scheduleJobs() throws InterruptedException {
        new ClinicalTrialsDataExtractor().execute();
}