getTimerService() is method from EJBContext used to get TimerService object.
It can not be invoked from
1) setSessionContext - becoz EJBContext/SessionContext is not initialised for use.
2) ejbCreate - becoz dependency injection methods (e.g. setSessionContext) are invoked after this method
3) ejbRemove - becoz there is no way to ensure when this method gets called
by the container in case of stateless bean. So not useful to get timer service instance.
Hope this helps you.
subject: Invoking getTimerService method from Session bean