JBoss Community

Hello,

I try this solution to retrieve processInstance varaibles but I got a NullPointerException.

Before I tried this solution : https://community.jboss.org/message/798123 without success.

Eric how can you do to have a not null processInstance please?

Here my code :

/**
           * This method allow to access object store in
           * process instance variables
           * @return an object link to the processInstance
           */
          public Object getProcessVariable(Long processInstanceId, Long taskId, String key){
                    final Long piId = processInstanceId;
                    Object retObj = null;
                    WorkflowProcessInstance wpi = (WorkflowProcessInstance)kSession.getProcessInstance(processInstanceId);
                    if((wpi == null) || (wpi.getVariable(key) == null)){
  
                              //method1 : retrieve content map variables
                              Task task = getTaskService().getTask(taskId);
                              TaskData tData = task.getTaskData();
                              Long docContentId = tData.getDocumentContentId();
                              System.out.println("process instance is null, doc contentId = "+docContentId);
                              Content content = getTaskService().getContent(docContentId);
                              Map<?, ?> variables = ((Map<?, ?>) ContentMarshallerHelper.unmarshall(content.getContent(), null));
  
                              //display keys
                              System.out.println("content map keys :");
                              for(Object o : variables.keySet()){
                                        System.out.println(o.toString());
                              }
                              System.out.println("and key search is "+key);
                              /*
                              content map keys :
                                        ActorId
                                        Skippable
                                        TaskName
                                        GroupId
  
                              key search is formId
                              */
                              retObj = variables.get(key);
  
                              //method 2 : retrieve the the variable Scope
                              Map<String, Object> variables2 = kSession.execute(new GenericCommand<Map<String, Object>>(){
 
 
                                        @Override
                                        public Map<String, Object> execute(Context context) {
                                                  StatefulKnowledgeSession ksession = ((KnowledgeCommandContext) context).getStatefulKnowledgesession();
                                                  ProcessInstanceImpl processInstance = (ProcessInstanceImpl) ksession.getProcessInstance(piId);
                                                  VariableScopeInstance variableScope = (VariableScopeInstance) processInstance.getContextInstance(VariableScope.VARIABLE_SCOPE); // ==> NullPointerException
                                                  Map<String, Object> variables = variableScope.getVariables();
                                                  return variables;
                                        }
  
                              });
                              //display keys
                              System.out.println("variables keys :");
                              for(Object o : variables2.keySet()){
                                        System.out.println(o.toString());
                              }
                              System.out.println("key search is "+key);
  
                              retObj = variables2.get(key);
                    }else{
                              retObj = wpi.getVariable(key);
                    }
                    return retObj;
          }

Thanks and Best Regards.