passing objects between tasks

[badda]

I just started looking into JBPM 5.1. I am bit confused with the way flows in  JBPM 5.  I am trying to create a simple example with 3 tasks in one process definition , like:  start -> task1 -> task2 -> task3 -> end.

I have a person ojbect that i want to do is :

   - pass Person Object to Task1,  and have it set Id and Name.

   - Task2 to take same Person object and set Address and Phone.

  - Task3 to print Person Object

How can i do this in JBPM 5?  Appreciate your inputs/help.

Please note: I have used JBPM 3.x,  familiar with JPBM 3.x action handlers and Context.  

--thanks

badda

[calca]

Hi!

In your process you have to model the inputs and outputs of each test. In your case, coudl be:

task1

input: -

output: Person object

task2:

input: Person object

output: Person object

task3:

input: Person object

output-

You should declare your Person object as process variable:

<itemDefinition id="_personItem" structureRef="org.test.Person" />

...

<property id="person" itemSubjectRef="_personItem"/>

When declaring inputs and outputs you should make reference to this process variable, for example

For input:

<dataInputAssociation>

           <sourceRef>person</sourceRef>

        <targetRef>_9_personInput</targetRef>

      </dataInputAssociation>

and for output:

      <dataOutputAssociation>

        <sourceRef>_8_personOutput</sourceRef>

        <targetRef>person</targetRef>

      </dataOutputAssociation>

This should help you:

http://dcalca.wordpress.com/2011/05/06/variables-in-jbpm5-human-tasks/

Hope it helps,

Demian

[badda]

Thanks Demian.   I will look at the link.  But does this have to be human task? 

[calca]

Sorry, I thought you needed human tasks. Anyway, it is the same, inputs and outputs from tasks, that I described.

You can check in this process how process variables are used in the bpmn file:

https://github.com/calcacuervo/HumanTaskExamples/blob/master/human-task-web-ui-example/human-tasks-server-management/src/main/resources/process/jbpm5/humanTask.bpmn

In case it is not a human task, I imagine you will have your own WorkItemHandlers, right?

Then, to get the input, something like this should work:

workItem.getParameter("personInput");

Then modify it,

...

And then complete the task with

Map<String, Object> output;

output.put("personOutput")

manager.completeWorkItem(workItem.getId(), );

[badda]

Thanks again!. yes i would like use WorkItemHandlers. Are there WorkItemHandlers examples (in Java) that i can follow?

thanks lot!

[garytse]

http://sourceforge.net/projects/jbpm/files/jBPM%205/jbpm-5.1.0.Final/

jbpm-5.1.0.Final-examples.zip

Unzip and study every one of those cases (especially the Junit ones).  Extremely helpful.

[badda]

Thank you both. I was able to get one task WorkItemHandler working. My next question is -

If i have two tasks, each task to have different WorkItemHandlers - how can i achive this? I want task1 to execute WorkItemHandler1 and task2 to execute WorkItemHandler2.

thanks lot

b

[calca]

You have to register the task to the workitem. You can take a look at the user guide:

http://docs.jboss.org/jbpm/v5.1/userguide/ch13.html#d0e3599

Something like

ksession.getWorkItemManager().registerWorkItemHandler(
    "task1", new WorkItemHandler1()

ksession.getWorkItemManager().registerWorkItemHandler(
    "task2", new WorkItemHandler2()

Hope it helps,

Demian

[badda]

Thanks Damian. In this case how do i know (or how does JBPM process) task1 handler is WorkItemHandler1 and Task2 Handler is WorkItermHandler2. Is there any mapping i need to set when defining task or does i need to call  HandlerX.completeItem() etc.

thanks log.,

b

[calca]

Hi badda,

When definning the bpmn, you see in the xml:

<task id="_5" name="MyTask" tns:taskName="task1">

And then you map this task name to the workItemHandler:

ksession.getWorkItemManager().registerWorkItemHandler(
    "task1", new WorkItemHandler1()

Demian

[badda]

Thank lot.. It looks like there is no way to specify 'tns:taskName' in JBPM process editor. Instead i opened the .xml and added

        <userTask id="_2" name="My Task1" tns:taskName="task1" >

      <userTask id="_3" name="My Task2" tns:taskName="task2" >

I then register handlers as

ksession.getWorkItemManager().registerWorkItemHandler(
    "task1", new WorkItemHandler1()

ksession.getWorkItemManager().registerWorkItemHandler(
    "task2", new WorkItemHandler2()

Junit now errors : Could not find work item handler for Human Task.  Do i need to specify Handler type? what am i missing here?

Appreciate your help.

b

[badda]

i figured out that - these tasks can not be <userTask> tasks, instead I changed the BPMN .xml to <task>

      <task id="_2" name="My Task1" tns:taskName="task1" >

      <task id="_3" name="My Task2" tns:taskName="task2" >

This seems to work fine.  Is this the correct way?

thanks

B

[calca]

It depends. If you use userTask, you have to register the handler with name "Human Task", for example:

session.getWorkItemManager().registerWorkItemHandler("Human Task",new CommandBasedWSHumanTaskHandler(session));

If you will make your custom task, you have to specify the name in the bmpn and when registering.

Demian

[badda]

Thanks Damian

If i have two User Tasks in the same the BPMN.  How can i have each User Task with own different handlers? I am open to other ways try? 

For example, i can NOT do this - as it executed only the last.

ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new WorkItemHandler1()

ksession.getWorkItemManager().registerWorkItemHandler( "Human Task", new WorkItemHandler2()

-

Thanks lot,

B

[calca]

It depends on what you are trying to do. Why using different handlers for each human task? You can do it using <task>, but I recomend you to read and understand

http://docs.jboss.org/jbpm/v5.1/userguide/ch.Human_Tasks.html

and see if you are following the right approach, you can also take a look at this simple test that has two simple human tasks,

https://github.com/calcacuervo/JBPM5-Samples/blob/master/human-tasks/src/test/java/com/test/HumanTaskTest.java

Demian