定时服务：Bean在EJB3.1中没有定时器

Question

Actually, am migrating an application from EJB2.1 to EJB3.1 . After changed the application I got an issue while calling getTimers() method.

I am using the Websphere server.

Here is my code:

@Stateless
@TransactionManagement(TransactionManagementType.BEAN)
public class TimedRequestBean implements TimedRequestLocal {    
    @Resource
    private SessionContext sessionContext;
    public void cancelTimers() {
            TimerService ts = this.sessionContext.getTimerService();
            Collection timers = ts.getTimers();
            Iterator it = timers.iterator();
            while (it.hasNext()) {
                Timer myTimer = (Timer)it.next();
                myTimer.cancel();
            }
       }
}

Log:

javax.ejb.EJBException: See nested exception; nested exception is: java.lang.IllegalStateException: Timer Service: Bean does not have timers: BeanId(LeadDeliverySystemEAR#timedrequest.jar#TimedRequestBean, null) java.lang.IllegalStateException: Timer Service: Bean does not have timers: BeanId(LeadDeliverySystemEAR#timedrequest.jar#TimedRequestBean, null) at com.ibm.ejs.container.BeanO.getTimers(BeanO.java:1733) at com.ford.it.request.async.TimedRequestBean.cancelTimers(TimedRequestBean.java:460)

Answer 1

TimerService.getTimers() throws the IllegalStateException if the bean has not been declared to have any timers. To avoid this, the bean must use either @Scheulde to declare an automatic timer, or @Timeout to declare the timeout callback method for programmatic timers (or the XML equivalent of either annotation).

Basically, the TimerService is not accessible to beans that cannot possibly have timers. Since there is no @Timeout method, none of the create methods may be called on the TimerService ; similarly, since no timers can exist for the bean, calling getTimers() is also not permitted.

Answer 2

Finally I got the solution. I have implement the TimedObject interface in my bean Its working fine. Here is my code.

@Stateless
@TransactionManagement(TransactionManagementType.BEAN)
public class TimedRequestBean implements TimedRequestLocal, TimedObject {    
    @Resource
    private SessionContext sessionContext;
    public void cancelTimers() {
            TimerService ts = this.sessionContext.getTimerService();
            Collection timers = ts.getTimers();
            Iterator it = timers.iterator();
            while (it.hasNext()) {
                Timer myTimer = (Timer)it.next();
                myTimer.cancel();
            }
       }
}

Source : http://itdoc.hitachi.co.jp/manuals/3020/30203Y0610e/EY060069.HTM I think it will be useful for others.