Symptom:
Health monitoring jobs stuck in the scheduled state:

Following messages are available in the jobManager.log:

[2014-04-28 15:29:41,957] [myScheduler_Worker-5] [LoggingTriggerHistoryPlugin] [INFO ] - Trigger DEFAULT.Trigger_CollectionPlanPushJob###PushCollectionPlanToDA completed firing job DEFAULT.CollectionPlanPushJob###PushCollectionPlanToDA at 15:29:41 04/28/2014 with resulting trigger instruction code: DO NOTHING 
[2014-04-28 15:30:01,163] [myScheduler_Worker-3] [LoggingTriggerHistoryPlugin] [INFO ] - Trigger DEFAULT.Trigger_PollerJob###SAM_Poller_11700_1_CPU_168013170 fired job DEFAULT.PollerJob###SAM_Poller_11700_1_CPU_168013170 at: 15:30:01 04/28/2014 
[2014-04-28 15:30:01,165] [myScheduler_Worker-3] [JobRunShell] [ERROR] - Job DEFAULT.PollerJob###SAM_Poller_11700_1_CPU_168013170 threw an unhandled Exception: 
org.springframework.core.task.TaskRejectedException: Executor [java.util.concurrent.ThreadPoolExecutor@c3dfdd6] did not accept task: com.cisco.xmp.jobmanager.common.JobProcessor@53855d86

Conditions:
Unknown