ejb3/src/main/java/org/jboss/as/ejb3/timerservice/TimerTask.java
protected void retryTimeout(TimerImpl timer) throws Exception {
        boolean callTimeout = false;

        timer.lock();
        try {
            if (timer.isActive()) {
                EJB3_TIMER_LOGGER.retryingTimeout(timer);
                timer.setTimerState(TimerState.RETRY_TIMEOUT, Thread.currentThread());
                timerService.persistTimer(timer, false);
                callTimeout = true;
            } else {
                EJB3_TIMER_LOGGER.timerNotActive(timer);
            }
        } finally {
            timer.unlock();
        }
        if(callTimeout) {
            this.callTimeout(timer);
        }
    }
protected void retryTimeout(TimerImpl timer) throws Exception {
        boolean callTimeout = false;

        timer.lock();
        try {
            if (timer.isActive()) {
                EJB3_TIMER_LOGGER.retryingTimeout(timer);
                timer.setTimerState(TimerState.RETRY_TIMEOUT, Thread.currentThread());
                timerService.persistTimer(timer, false);
                callTimeout = true;
            } else {
                EJB3_TIMER_LOGGER.timerNotActive(timer);
            }
        } finally {
            timer.unlock();
        }
        if(callTimeout) {
            this.callTimeout(timer);
        }
    }
After a timeout failed the timer need to retried.
The method must lock the timer for state check and update but not during callTimeout run.

@param timer timer to retry and state updates
@throws Exception