java.lang.NullPointerException
        at org.drools.time.impl.JDKTimerService.removeJob(JDKTimerService.java:103)
        at org.drools.time.impl.JDKTimerService.removeJob(JDKTimerService.java:103)
        at org.drools.common.Scheduler.removeAgendaItem(Scheduler.java:63)
        at org.drools.common.DefaultAgenda.removeScheduleItem(DefaultAgenda.java:371)
        at org.drools.common.ScheduledAgendaItem.remove(ScheduledAgendaItem.java:90)
        at org.drools.reteoo.RuleTerminalNode.retractLeftTuple(RuleTerminalNode.java:253)
        at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:212)
        at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:86)
        at org.drools.reteoo.NotNode.propagateRetractLeftTuple(NotNode.java:459)
        at org.drools.reteoo.NotNode.assertObject(NotNode.java:154)
        at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450)
        at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:378)
        at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
        at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450)
        at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:368)
        at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:193)
        at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:143)
        at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:332)
        at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:293)
        at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:905)
        at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMe