问题
I am new to EJB 3 . I use the following code to start endless EJB 3 timer then deploying it on JBOSS 4.2.3
@Stateless
public class SimpleBean implements SimpleBeanRemote,TimerService {
@Resource
TimerService timerService;
private Timer timer ;
@Timeout
public void timeout(Timer timer) {
System.out.println("Hello EJB");
}
}
then calling it
timer = timerService.createTimer(10, 5000, null);
It works well. I created a client class that calls a method that creates the timer and a method that is called when the timer times out.
I forget to call cancel then it does not stop .redeploy with cancel call never stop it. restart Jboss 4.2.3 never stop it. How I can stop EJB timer ? Thanks for helping.
回答1:
public void stop(String timerName) {
for(Object obj : timerService.getTimers()) {
Timer t = (Timer)obj;
if (t.getInfo().equals(timerName)) {
t.cancel();
}
}
}
回答2:
I had the same problem, with my JBoss AS 6.1.
After killing this endless (persistent) timers I found the following solution for AVOIDING this
problem in the future:
With JBoss AS 6.1 (EJB 3.1) it is possible to create non-persistent automatic timers, they DO NOT SURVIVE a server restart:
@Schedule(minute=”*/10”, hour=”*”, persistent=false)
public void automaticTimeout () {
回答3:
You can also undeploy your application, this will "kill" all timers.
回答4:
Another method is to creat ethe automatic timer (@Schedule) with the 'info' attribute and then check in the timer service for timers with the same info and if available cancel it:
@Schedule(hour="*", minute="*",second="3", persistent=false,info="AUTO_TIMER_0")
void automaticTimeOut(){
if(timerCount==0){System.out.println("FROM AUTOMATIC TIME OUT -----------------> CALLED");timerCount++;}
else{
Iterator<Timer> timerIterator=timerService.getTimers().iterator();
Timer timerToCancel=null;
while(timerIterator.hasNext()){
Timer tmpTimer=timerIterator.next();
if(tmpTimer.getInfo().equals("AUTO_TIMER_0")){timerToCancel=tmpTimer;break;}
}//while closing
if(timerToCancel!=null){
timerToCancel.cancel();
System.out.println("AUTOMATIC TIMER HAS BEEN CANCELED ----------------->>>>");
}//if closing
}//else closing
}//automaticTimeOut closing
回答5:
Try the @PreDestroy annotation within the bean where you want to close.
For example:
@PreDestroy
private void undeployTimer() {
//..
}
Generally the resource de-allocation is done here.
回答6:
Since EJB 3.1, there are new methods on TimerService which take a TimerConfig instead of a Serializable payload. Using TimerConfig allows to make the Timer non-persistent.
timerService.createIntervalTimer(10, 5000, new TimerConfig(null, false));
来源：https://stackoverflow.com/questions/2112190/how-to-stop-endless-ejb-3-timer