I found the issue. I was using the drools MapPersistenceContext instead of the sample from
https://github.com/krisv/jbpm/blob/master/jbpm-persistence-jpa/src/test/java/org/jbpm/persistence/map/impl/MapBasedPersistenceTest.java
But now I am getting the following error below sometimes. What could have caused this?
java.lang.NullPointerException
at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.setState(WorkflowProcessInstanceImpl.java:251)
at org.jbpm.marshalling.impl.AbstractProcessInstanceMarshaller.readProcessInstance(AbstractProcessInstanceMarshaller.java:382)
at org.jbpm.persistence.processinstance.ProcessInstanceInfo.getProcessInstance(ProcessInstanceInfo.java:133)
at org.jbpm.persistence.processinstance.JPAProcessInstanceManager.getProcessInstance(JPAProcessInstanceManager.java:64)
at org.jbpm.process.instance.ProcessRuntimeImpl.getProcessInstance(ProcessRuntimeImpl.java:190)
at org.drools.common.AbstractWorkingMemory.getProcessInstance(AbstractWorkingMemory.java:1113)
at org.drools.impl.StatefulKnowledgeSessionImpl.getProcessInstance(StatefulKnowledgeSessionImpl.java:283)
at org.jbpm.persistence.processinstance.JPASignalManager.signalEvent(JPASignalManager.java:24)
at org.jbpm.process.instance.ProcessRuntimeImpl.signalEvent(ProcessRuntimeImpl.java:355)
at org.drools.impl.StatefulKnowledgeSessionImpl.signalEvent(StatefulKnowledgeSessionImpl.java:321)
at org.drools.command.runtime.process.SignalEventCommand.execute(SignalEventCommand.java:91)
at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:292)
at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.signalEvent(CommandBasedStatefulKnowledgeSession.java:200)