my environment is jboss 4.0.2 (linux)
Timer persistence is turned off in ejb-deployer.xml
this seems to occur when I cancel and recreate a timer (essentially resetting the timer).
When ejbTimeout() is called and completes, another call to ejbTimeout() occurs! Hence, I get 2 calls to ejbTimeout() when i really only want one.
This situation is described in timers section if EJB2.1 spec. Look there.