10:47 a.m.
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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