[jboss-user] [jBPM] - Re: getProcess in ProcessInstanceImpl throws a NullPointerException

Sandra Renaud [https://community.jboss.org/people/joploya] created the discussion "Re: getProcess in ProcessInstanceImpl throws a NullPointerException" To view the discussion, visit: https://community.jboss.org/message/806458#806458 -------------------------------------------------------------- Sorry but I don't understand your answer. I recurrently throws this error when I work with WorkflowProcessInstance. This is the code that failed : WorkflowProcessInstance wpi = (WorkflowProcessInstance)kSession.getProcessInstance(processInstanceId); *wpi.setVariable(key, object);* or   WorkflowProcessInstance wpi = (WorkflowProcessInstance)kSession.getProcessInstance(processInstanceId);                     if((wpi == null) || (wpi.getVariable(key) == null)){        //This case never appears because of persistent sessions                                    System.out.println("workflow process instance is null :-(");                     }else{                                    System.out.println("workflow process instance is NOT null :-)");                                    retObj = wpi.getVariable(key);                                    //node info                                    System.out.println("list of node instance : ");                                    for(NodeInstance iNode : wpi.getNodeInstances()){ *Node node = iNode.getNode();*         }   } -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/806458#806458] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]