JBoss EAP 6 OutOfMemory caused by millions of FutureTask instances related to the EJB TimerService

Solution Verified - Updated -

Issue

  • We have a JBoss EAP 6.0.1 instance which crashes after a while with an OutOfMemory error, the heapdump shows that we have about 15 million instances of FutureTask, LinkedBlockingQueue$Node etc. related to org.jboss.as.ejb3.timerservice.task.TimerTask We have round about 10-20 ejb timer which schedule some tasks every minute, but they will not generate million of events in a few hours ? Some timers are fired every millisecond. This is a migrated application from JBoss 5 where it worked fine.

Environment

Red Hat JBoss Enterprise Application Platform (EAP) 6.0.1

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