I got this stack when firing an Event.  The result of the event is that the process should be completed, details of Event below: java.lang.NullPointerException  at org.drools.persistence.processinstance.JPAProcessInstanceManager.removeProcessInstance(JPAProcessInstanceManager.java:82)  at org.drools.common.AbstractWorkingMemory.removeProcessInstance(AbstractWorkingMemory.java:1724)  at org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.setState(WorkflowProcessInstanceImpl.java:186)  at org.drools.workflow.instance.node.EndNodeInstance.internalTrigger(EndNodeInstance.java:56)  at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:112)  at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:148)  at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:135)  at org.drools.workflow.instance.node.ActionNodeInstance.triggerCompleted(ActionNodeInstance.java:62)  at org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:58)  at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:112)  at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:148)  at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:135)  at org.drools.workflow.instance.node.JoinInstance.triggerCompleted(JoinInstance.java:152)  at org.drools.workflow.instance.node.JoinInstance.internalTrigger(JoinInstance.java:65)  at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:112)  at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:148)  at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:135)  at org.drools.workflow.instance.node.EventNodeInstance.triggerCompleted(EventNodeInstance.java:70)  at org.drools.workflow.instance.node.EventNodeInstance.internalTrigger(EventNodeInstance.java:62)  at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:112)  at org.drools.workflow.instance.node.EventNodeInstance.signalEvent(EventNodeInstance.java:50)  at org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:272)  at com.csatp.svc.rulesmgr.claim.ClaimsDemoJpaTest.createNewSession(ClaimsDemoJpaTest.java:173) I am firing an event at a process created in