In EJB 3.1 I can get all timers for a specific bean using TimerService#getTimers() on the TimerService instance obtained for that bean.
What I actually need however
You can only see timers of your own class. With the EJB Scheduler you can't list all timers of your application.
@Resource
private TimerService timerService;
for (Timer timer : timerService.getTimers()) {
// do anything
}
With Quartz you can via Scheduler.getJobNames/triggerNames for all jobs/triggers of you application.