I'm injecting the TimerService with an @Resource annotation inside a JMX bean:

@Resource
private TimerService timerService;

When I call timerservice.getTimers().size() in the start() method of the JMX, it always return 0.
If I schedule a new timer inside the JMX, then timerService.getTimers().size() return 1.

I saw a similar bug previously (JBAS-1394) that was supposedly fixed in JBossAS-4.0.4RC1

I'm not sure if anything changed in this regard, but I would think it should be possible to retrieve persisted timers in order to cancel them if necessary