2 Replies Latest reply on Nov 21, 2011 1:04 AM by qintao1203

How to setVariable after JPAKnowledgeService.loadStatefulKnowledgeSession

qintao1203 Nov 17, 2011 3:41 AM

Hi all,

I write some code to change variables of process , but it can't work .

The error info:

java.lang.NullPointerException

at org.jbpm.process.instance.impl.ProcessInstanceImpl.getProcess(ProcessInstanceImpl.java:67)

at org.jbpm.process.instance.impl.ProcessInstanceImpl.getContextInstance(ProcessInstanceImpl.java:127)

at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.setVariable(WorkflowProcessInstanceImpl.java:237)

My code :

KnowledgeBase kbase = createKnowledgeBase();

StatefulKnowledgeSession ksession =JPAKnowledgeService.loadStatefulKnowledgeSession(jbpm.getSessionId(), kbase, null, getEnv() );

CommanWSHumanTaskHandler humanTaskHandler = new CommanWSHumanTaskHandler(ksession);

humanTaskHandler.setClient(taskClientWrapper.getTaskClient());

humanTaskHandler.setSessionId(ksession.getId());

ksession.getWorkItemManager().registerWorkItemHandler("Human Task", humanTaskHandler);

humanTaskHandler.connect();

ProcessInstance pi = ksession.getProcessInstance(jbpm.getProcessId());

Boolean isSign = (Boolean) ((WorkflowProcessInstance)pi).getVariable("isSign");

List<String> list = (List<String>) ((WorkflowProcessInstance)pi).getVariable("signers"); // isSign and list are not null.

((WorkflowProcessInstance)pi).setVariable("isSign", true); // throws exception

((WorkflowProcessInstance)pi).setVariable("signers", signers);

ksession.insert(pi);

I don't understand why. and How to fix it.

1. Re: How to setVariable after JPAKnowledgeService.loadStatefulKnowledgeSession

qintao1203 Nov 17, 2011 4:34 AM (in response to qintao1203)

sad!
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2. Re: How to setVariable after JPAKnowledgeService.loadStatefulKnowledgeSession

qintao1203 Nov 21, 2011 1:04 AM (in response to qintao1203)

solve it.

I set a uuid for every flow !
and cached signers by uuid .   cache.put(uuid ,List<String> signers);
and cache.get(uuid) by script task.

if(null == p || p.size()==0){
                     isSign = false;
                     signers = null;
                     kcontext.setVariable("isSign",false);
                    kcontext.setVariable("signers",null);
           }else{
                               isSign = true;
                               signers = p;
                               kcontext.setVariable("isSign",true);
                              kcontext.setVariable("signers",p);
                              JbpmCache.remove(uuid);
           }

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