Description of problem:
f a timer is canceled inside of the @timeout method the scheduler will log an ERROR if the timer duration is longer than the intervall and an overlapping execution should be fired.
This is due to internal validatons.

This will not happen if the timer is canceled by an external process, here the scheduler is removed.

The log message is like this:
ERROR [org.jboss.as.ejb3] (EJB default - 2) JBAS014273: Exception running timer task for timer 00329ec2-a70f-44d6-b8f1-521ab5c3f5eb on EJB ejb30-timer.ejb30-timer.SimpleTimerBean: javax.ejb.NoSuchObjectLocalException: JBAS014469: Timer was canceled
	at org.jboss.as.ejb3.timerservice.TimerImpl.assertTimerState(TimerImpl.java:468) [jboss-as-ejb3-7.5.5.Final-redhat-3.jar:7.5.5.Final-redhat-3]
	at org.jboss.as.ejb3.timerservice.TimerImpl.isPersistent(TimerImpl.java:224) [jboss-as-ejb3-7.5.5.Final-redhat-3.jar:7.5.5.Final-redhat-3]
	at org.jboss.as.ejb3.timerservice.TimerServiceImpl.shouldRun(TimerServiceImpl.java:1080) [jboss-as-ejb3-7.5.5.Final-redhat-3.jar:7.5.5.Final-redhat-3]
	at org.jboss.as.ejb3.timerservice.task.TimerTask.run(TimerTask.java:118) [jboss-as-ejb3-7.5.5.Final-redhat-3.jar:7.5.5.Final-redhat-3]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [rt.jar:1.8.0_71]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [rt.jar:1.8.0_71]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_71]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_71]
	at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_71]
	at org.jboss.threads.JBossThread.run(JBossThread.java:122) [jboss-threads-2.1.2.Final-redhat-1.jar:2.1.2.Final-redhat-1]