public Timer createTimer(Date expiration,
    Serializable info) throws IllegalArgumentException, EJBException, IllegalStateException

 public Timer createTimer(long duration,
    Serializable info) throws IllegalArgumentException, EJBException, IllegalStateException

 public Timer createTimer(Date initialExpiration,
    long intervalDuration,
    Serializable info) throws IllegalArgumentException, EJBException, IllegalStateException

 public Timer createTimer(long initialDuration,
    long intervalDuration,
    Serializable info) throws IllegalArgumentException, EJBException, IllegalStateException

 public Collection getTimers() throws EJBException, IllegalStateException