scheduled一分钟执行一次,@Schedule注释每隔几分钟（或秒）运行一次

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scheduled一分钟执行一次,@Schedule注释每隔几分钟（或秒）运行一次

I would like to try to use the @Schedule annotation in the following way:

public class MyTestServlet extends HttpServlet {

private static JcanLogger LOG = JcanLoggerFactory.getLogger(ServiceTestServlet.class);

@EJB CronService cronService;

public void service(HttpServletRequest req, HttpServletResponse resp) throws .... {

....

cronService.iLive();

}

---

@Local // because the ejb is in a servlet (there is no other jvm)

public interface CronService {

public void iLive();

public void runsEveryMinute();

}

---

@Singleton

public class CronServiceBean implements CronService {

private static final JcanLogger LOG = JcanLoggerFactory.getLogger(CronServiceBean.class);

@Schedule(minute="*")

public void runsEveryMinute() {

LOG.info(" runs EveryMinute ");

}

public void iLive() {

LOG.info("iLive");

}

---

LOG

...

CronServiceBean:34 ] iLive

Based on the log, the CronService live and well, but the scheduled task 'runsEveryMinute' doesnt work.

How should it work using an EJB scheduled task?

解决方案

As per the Javadoc for the @Schedule annotation, the default values are:

* for all fields except hour, minute, and second; and

0 for hour, minute, and second, by default.

By specifying minute="*" and leaving hour at its default of 0, it requests that the timer run every minute after midnight for one hour (i.e., 00:00, 00:01, 00:02, ..., 00:59) and then not again until the next day. Instead, use:

@Schedule(hour="*", minute="*")

To run every few seconds (e.g., 10 seconds), you can use a cron-like syntax:

@Schedule(hour = "*", minute = "*", second = "*/10", persistent = false)

By default, the scheduler persists events. Setting persistent = false will prevent them from building up over time, if so desired.

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