[jboss-user] [jBPM] - How to setVariable after JPAKnowledgeService.loadStatefulKnowledgeSession

[Jack Q tao]

Jack Q tao [http://community.jboss.org/people/qintao1203] created the discussion

"How to setVariable after JPAKnowledgeService.loadStatefulKnowledgeSession"

To view the discussion, visit: http://community.jboss.org/message/636928#636928

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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.
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