sc_boss [https://community.jboss.org/people/sc_boss] created the discussion "NullPointerException while executing knowledgeSession.getProcessInstance" To view the discussion, visit: https://community.jboss.org/message/799131#799131 -------------------------------------------------------------- I'm looking at some code here in 5.4.0 (jbpm-flow/5.4.0.Final/jbpm-flow-5.4.0.Final-sources.jar): org.jbpm.marshalling.impl.AbstractProtobufProcessInstanceMarshaller.readProcessInstance(MarshallerReaderContext) it goes like this on line 373: Process process = ruleBase.getProcess( processId ); if ( ruleBase != null ) {      processInstance.setProcess( process ); } Isn't this code incorrect? If rule base were to be null it would have failed on the first line itself. May be the code should be: if ( *process* != null ) {      processInstance.setProcess( process ); } Not sure. I guess I'm running into this issue when i try to load the process instance: ProcessInstance pid = ksession.getProcessInstance(16); java.lang.NullPointerException     at org.jbpm.process.instance.impl.ProcessInstanceImpl.setProcess(ProcessInstanceImpl.java:62)     at org.jbpm.marshalling.impl.AbstractProtobufProcessInstanceMarshaller.readProcessInstance(AbstractProtobufProcessInstanceMarshaller.java:375)     at org.jbpm.persistence.processinstance.ProcessInstanceInfo.getProcessInstance(ProcessInstanceInfo.java:142)     at org.jbpm.persistence.processinstance.JPAProcessInstanceManager.getProcessInstance(JPAProcessInstanceManager.java:91)     at org.jbpm.process.instance.ProcessRuntimeImpl.getProcessInstance(ProcessRuntimeImpl.java:206)     at org.drools.common.AbstractWorkingMemory.getProcessInstance(AbstractWorkingMemory.java:1116)     at org.drools.impl.StatefulKnowledgeSessionImpl.getProcessInstance(StatefulKnowledgeSessionImpl.java:297)     at org.drools.command.runtime.process.GetProcessInstanceCommand.execute(GetProcessInstanceCommand.java:48)     at org.drools.command.runtime.process.GetProcessInstanceCommand.execute(GetProcessInstanceCommand.java:25)     at org.drools.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)     at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:373)     at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.getProcessInstance(CommandBasedStatefulKnowledgeSession.java:125)     at com.sample.ProcessTest.main(ProcessTest.java:64) -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/799131#799131] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]