[jboss-user] [jBPM] - Re: JBPM 5.4.0-Final: Human Task variable mapping is not working

[vchmakov]

vchmakov [https://community.jboss.org/people/vchmakov] created the discussion

"Re: JBPM 5.4.0-Final: Human Task variable mapping is not working"

To view the discussion, visit: https://community.jboss.org/message/789784#789784

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Hi Maciej,
 
That is exactly what is going on. However, as far as I understand and according to the examples coming with the JBPM deployment:
1)      The instance of the LocalHTWorkItemHandler is attached to the session and is purposed for the HT engine’s event handling. As far as I can see it does not possess the persistence context but rather shares it with the Drools’s one when rule’s RHS starts the process and the process reaches the wait/persisted state.
 
    *private* *void* registerHumanTaskHandler(StatefulKnowledgeSession session) {
        *if* (taskServer != *null*) {
            +logger+.info("Registering Human Task Handler...");
            LocalHTWorkItemHandler humanTaskHandler = *new* LocalHTWorkItemHandler(createTaskService(), session);
            humanTaskHandler.setLocal(*true*);
            humanTaskHandler.connect();
            session.getWorkItemManager().registerWorkItemHandler("Human Task", humanTaskHandler);
            +logger+.info("OK.");
        }
    }
 
 
2)      When user completes a task from the Web form the event is delivered to the engine. In my case it is a Message Queue event which I process in MDB. Then I create a fresh instance of the LocalTaskService and complete the task. According to the examples provided with the JBPM installation and the source code of the LocalTaskService it is a recommended way to avoid reusing of the Entity Manager.
 
 
    *private* *void* registerHumanTaskHandler(StatefulKnowledgeSession session) {
        *if* (taskServer != *null*) {
            +logger+.info("Registering Human Task Handler...");
            LocalHTWorkItemHandler humanTaskHandler = *new* LocalHTWorkItemHandler(createTaskService(), session);
            humanTaskHandler.setLocal(*true*);
            humanTaskHandler.connect();
            session.getWorkItemManager().registerWorkItemHandler("Human Task", humanTaskHandler);
            +logger+.info("OK.");
        }
    }
 
    *private* *void* createTaskServer() *throws* Exception {
        +logger+.info("Creating Task Server...");
        *if* (persistenceManager != *null*) {
            taskServer = *new* TaskService(persistenceManager.getTaskEntityManagerFactory(),
                    SystemEventListenerFactory.+getSystemEventListener+());
        }
        *else* {
            *throw* *new* IllegalArgumentException("createTaskServer() - Persistence Manager must be created for this operation");
        }
        +logger+.info("OK.");
    }
 
    *private* org.jbpm.task.TaskService createTaskService() {
        +logger+.debug("Creating Task Service...");
        *if* (taskServer != *null*) {
            *return* *new* LocalTaskService(taskServer);
        }
        *else* {
            *throw* *new* IllegalArgumentException("Task Server is not yet created");
        }
    }
 
    *private* *void* processCompleteTaskCommand(BvCompleteTaskCommand command) *throws* Exception {
        +logger+.trace("Processing TaskCompleteCommand()...");
        *final* String userId = command.getUserId();
        *final* String wf_userId = +WORKFLOW_USERID+;
        logger_processes.debug("Completing task id={}, userId={}", command.getTaskId(), userId);
 
        org.jbpm.task.TaskService taskService = createTaskService();
 
        taskService.start(command.getTaskId(), wf_userId);
 
        Object data = command.getData();
        *if* (data != *null*) {
            taskService.completeWithResults(command.getTaskId(), wf_userId, data);
        }
        *else* {
            logger_processes.debug("**** data is NULL");
            taskService.complete(command.getTaskId(), wf_userId, *null*);
        }
        logger_processes.debug("  - task id={}, userId={} completed.", command.getTaskId(), userId);
        +logger+.trace("Processing TaskCompleteCommand(). OK.");
    }
 
 
It seems to me that I’m misunderstanding something…
 
Thanks,
 
Vladimir


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