Manual Task Creation Using Camunda Modeler

Gayathri · November 21, 2019, 11:45am

Hi All,

Iam using Camunda with Spring Boot.I have created Manual Task using Camunda Modeler.But I dont know how to proceed further like how to transfer the control back to workflow after the manual task is completed. Or what approach we should follow starting from manual task.

Niall · November 21, 2019, 1:23pm

Can you upload your model?
What exactly would you like to accomplish with your process?

Gayathri · November 21, 2019, 1:28pm

Iam just exploring Camunda so that I can take up my actual use case. So I am trying to create all types of tasks and sub process and play around it . Right now control comes to my manual task via workflow. Manual task must decide a condition and set a variable to be true or false.

Niall · November 21, 2019, 1:31pm

There is a difference between a Manual Task and a User Task.
There is no way for a manual task to get information from a user. It’s more likely that you’d want to use a User Task.

Gayathri · November 21, 2019, 1:36pm

I get it that both are different. So what happens when there is a manual task say for example check the connection at site.once I get report from technician after the inspection how will I proceed to the next step in workflow.

aravindhrs · November 21, 2019, 2:11pm

usertask would be sufficient for this.

Gayathri · November 21, 2019, 2:18pm

But visiting the site in person is something more of manual task.

martin.stamm · November 21, 2019, 2:58pm

From the Manual Task docs:

It is used to model work that is done by somebody who the engine does not need to know of and is there no known system or UI interface.

As soon as you need information acquired from the task, you need to use a usertask and cannot use a manual task

Gayathri · November 21, 2019, 4:06pm

Thanks for that info. By the way does manual task call any Api or how does it stop further step ahead in the workflow

martin.stamm · November 21, 2019, 4:13pm

For the engine, a manual task is handled as a pass-through activity, automatically continuing the process at the moment the process execution arrives at it.

Gayathri · November 22, 2019, 1:49am

Thank you. Is there any source code available for reference.

tmetzke · November 22, 2019, 6:59am

Hi @Gayathri,

well, the ManualTaskActivityBehavior does not have much code for reference, but you can start exploring from there.

In the end, it comes down to the execute method you can see here:

github.com

camunda/camunda-bpm-platform/blob/6d61e9fb6ba961f4231f9aff84baa82d48f6922c/engine/src/main/java/org/camunda/bpm/engine/impl/bpmn/behavior/FlowNodeActivityBehavior.java#L43


*/
public abstract class FlowNodeActivityBehavior implements SignallableActivityBehavior {


 protected static final BpmnBehaviorLogger LOG = ProcessEngineLogger.BPMN_BEHAVIOR_LOGGER;


 protected BpmnActivityBehavior bpmnActivityBehavior = new BpmnActivityBehavior();


 /**
  * Default behaviour: just leave the activity with no extra functionality.
  */
 public void execute(ActivityExecution execution) throws Exception {
   leave(execution);
 }


 /**
  * Default way of leaving a BPMN 2.0 activity: evaluate the conditions on the
  * outgoing sequence flow and take those that evaluate to true.
  */
 public void leave(ActivityExecution execution) {
   ((ExecutionEntity) execution).dispatchDelayedEventsAndPerformOperation(PvmAtomicOperation.ACTIVITY_LEAVE);
 }

As shown, when you reach the Manual Task and execute it, it is simply left again, so no extra logic besides that.

If you like, compare that to the UserTaskActivityBehavior and inspect how it differs from the Manual Task.

Best,
Tobias

Gayathri · November 22, 2019, 9:29am

HI @tmetzke

Thanks for the clarification. Is there any site or any project which explains how to create sub process,different tasks and integrate them with code using spring boot. Would be helpful as I am unable to find it.

system · January 30, 2024, 12:03pm