On Wildfly10, we are experiencing intermittent problems where on server startup, an @Timeout annotated method can be executed hundreds of times in a second (log below). Going through the references to the @Timeout methods and the @Scheduled methods, all scheduled methods are set to be non-persistent (ex: timerConfig.setPersistent(false), persistent=false) so we don't know how this could occur. It is not consistent and our only solution has been to kill the Wildfly10 server process and restart.

13:47:27,824 WARN [org.jboss.as.ejb3] (EJB default - 6) [ ] WFLYEJB0043: A previous execution of timer [id=d31eb95a-3f8b-4b7d-882e-f1ff53bc7de8 timedObjectId=synergy.synergy-app-head.QuartzWatcherService auto-timer?:false persistent?:false timerService=org.jboss.as.ejb3.timerservice.TimerServiceImpl@dec94c6 initialExpiration=null intervalDuration(in milli sec)=0 nextExpiration=Wed Apr 06 12:10:00 PDT 2016 timerState=IN_TIMEOUT info=null] is still in progress, skipping this overlapping scheduled execution at: Wed Apr 06 13:47:27 PDT 2016.
13:47:27,825 WARN [org.jboss.as.ejb3] (EJB default - 96) [ ] WFLYEJB0043: A previous execution of timer [id=d31eb95a-3f8b-4b7d-882e-f1ff53bc7de8 timedObjectId=synergy.synergy-app-head.QuartzWatcherService auto-timer?:false persistent?:false timerService=org.jboss.as.ejb3.timerservice.TimerServiceImpl@dec94c6 initialExpiration=null intervalDuration(in milli sec)=0 nextExpiration=Wed Apr 06 12:10:00 PDT 2016 timerState=IN_TIMEOUT info=null] is still in progress, skipping this overlapping scheduled execution at: Wed Apr 06 13:47:27 PDT 2016.
13:47:27,825 WARN [org.jboss.as.ejb3] (EJB default - 97) [ ] WFLYEJB0043: A previous execution of timer [id=d31eb95a-3f8b-4b7d-882e-f1ff53bc7de8 timedObjectId=synergy.synergy-app-head.QuartzWatcherService auto-timer?:false persistent?:false timerService=org.jboss.as.ejb3.timerservice.TimerServiceImpl@dec94c6 initialExpiration=null intervalDuration(in milli sec)=0 nextExpiration=Wed Apr 06 12:10:00 PDT 2016 timerState=IN_TIMEOUT info=null] is still in progress, skipping this overlapping scheduled execution at: Wed Apr 06 13:47:27 PDT 2016.
13:47:27,825 WARN [org.jboss.as.ejb3] (EJB default - 37) [ ] WFLYEJB0043: A previous execution of timer [id=d31eb95a-3f8b-4b7d-882e-f1ff53bc7de8 timedObjectId=synergy.synergy-app-head.QuartzWatcherService auto-timer?:false persistent?:false timerService=org.jboss.as.ejb3.timerservice.TimerServiceImpl@dec94c6 initialExpiration=null intervalDuration(in milli sec)=0 nextExpiration=Wed Apr 06 12:10:00 PDT 2016 timerState=IN_TIMEOUT info=null] is still in progress, skipping this overlapping scheduled execution at: Wed Apr 06 13:47:27 PDT 2016.