[jboss-user] [jBPM] - NullPointerException while executing knowledgeSession.getProcessInstance

[sc_boss]

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

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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)
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