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NullPointerException while executing knowledgeSession.getProcessInstance
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created by <a href="https://community.jboss.org/people/sc_boss">sc_boss</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/799131#799131">View the full discussion</a>
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<div class="jive-rendered-content"><p>I'm looking at some code here in 5.4.0 <span style="font-family: courier new,courier;">(jbpm-flow/5.4.0.Final/jbpm-flow-5.4.0.Final-sources.jar): </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier;"> org.jbpm.marshalling.impl.AbstractProtobufProcessInstanceMarshaller.readProcessInstance(MarshallerReaderContext) </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p> it goes like this on line 373: </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p> <span style="font-family: courier new,courier; color: #0000ff;">Process process = ruleBase.getProcess( processId );</span></p><p><span style="font-family: courier new,courier; color: #0000ff;">if ( ruleBase != null ) {</span></p><p><span style="font-family: courier new,courier; color: #0000ff;">     processInstance.setProcess( process );</span></p><p><span style="font-family: courier new,courier; color: #0000ff;">}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Isn't this code incorrect? If rule base were to be null it would have failed on the first line itself.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>May be the code should be:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; color: #0000ff;">if ( <span style="color: #ff0000; font-size: 12pt;"><strong>process </strong></span>!= null ) {</span></p><p><span style="font-family: courier new,courier; color: #0000ff;">     processInstance.setProcess( process );</span></p><p><span style="font-family: courier new,courier; color: #0000ff;">}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Not sure.</p><p>I guess I'm running into this issue when i try to load the process instance:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>ProcessInstance pid = ksession.getProcessInstance(16);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier;">java.lang.NullPointerException</span></p><p><span style="font-family: courier new,courier;">    at org.jbpm.process.instance.impl.ProcessInstanceImpl.setProcess(ProcessInstanceImpl.java:62)</span></p><p><span style="font-family: courier new,courier;">    at org.jbpm.marshalling.impl.AbstractProtobufProcessInstanceMarshaller.readProcessInstance(AbstractProtobufProcessInstanceMarshaller.java:375)</span></p><p><span style="font-family: courier new,courier;">    at org.jbpm.persistence.processinstance.ProcessInstanceInfo.getProcessInstance(ProcessInstanceInfo.java:142)</span></p><p><span style="font-family: courier new,courier;">    at org.jbpm.persistence.processinstance.JPAProcessInstanceManager.getProcessInstance(JPAProcessInstanceManager.java:91)</span></p><p><span style="font-family: courier new,courier;">    at org.jbpm.process.instance.ProcessRuntimeImpl.getProcessInstance(ProcessRuntimeImpl.java:206)</span></p><p><span style="font-family: courier new,courier;">    at org.drools.common.AbstractWorkingMemory.getProcessInstance(AbstractWorkingMemory.java:1116)</span></p><p><span style="font-family: courier new,courier;">    at org.drools.impl.StatefulKnowledgeSessionImpl.getProcessInstance(StatefulKnowledgeSessionImpl.java:297)</span></p><p><span style="font-family: courier new,courier;">    at org.drools.command.runtime.process.GetProcessInstanceCommand.execute(GetProcessInstanceCommand.java:48)</span></p><p><span style="font-family: courier new,courier;">    at org.drools.command.runtime.process.GetProcessInstanceCommand.execute(GetProcessInstanceCommand.java:25)</span></p><p><span style="font-family: courier new,courier;">    at org.drools.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)</span></p><p><span style="font-family: courier new,courier;">    at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:373)</span></p><p><span style="font-family: courier new,courier;">    at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.getProcessInstance(CommandBasedStatefulKnowledgeSession.java:125)</span></p><p><span style="font-family: courier new,courier;">    at com.sample.ProcessTest.main(ProcessTest.java:64)</span></p></div>
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