7 Replies Latest reply on Sep 8, 2011 7:00 PM by sroot

JBPM5 Content data problem

sroot Sep 8, 2011 3:42 PM

Hi all!

I was wondering if someone might be able to assist with this.

I have a process with a custom task and User Task,

I have Map and couple of Strings def

ined as process variables.

When the process goes to human task, and I retrieve

the Content for the Task via the TaskClient using Mina, I am unable to restore the Map. I found the following in the HumanTaskExample and it is exactly what I was doing

Content content = getContentResponseHandler.getContent();

ByteArrayInputStream bis = new ByteArrayInputStream(content.getContent());

ObjectInputStream in;

in = newObjectInputStream(bis);

Object result = in.readObject();

in.close();

Map<?, ?> map = (Map<?, ?>) result;

The problem is that "result" at this point is seen as a java.lang.String. All of my data is there when I print it out but I am unable to cast it back to a map. My process variable Map is being set when I complete the previous workitem

Am I missing something here? Looking at the JBPM source and examples it seems like this should work.

I'd appreciate all input, thanks.

-Scott.

SendFile.bpmn.zip 2.2 KB

1. Re: JBPM5 Content data problem

calca Sep 8, 2011 3:16 PM (in response to sroot)

Could please you share:
1) your process definition
2) how you are calling the taskClient.complete method?

Thanks

Demian
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2. Re: JBPM5 Content data problem

sroot Sep 8, 2011 3:48 PM (in response to calca)

Thanks for responding.
Process def attached to oringal post above.
My problem is even before I call taskClient.complete.
Its at the point where I retreive the Content and need to display data to the user. At that point content.getContent() I expect to return a byte array of type Map, but it is always String. It does have my Map key/value pairings and the values may themselves be another Map or even a List

This is how I get the Content:

public Content getContentForTask(Task task) {
long documentContentId = task.getTaskData().getDocumentContentId();
BlockingGetContentResponseHandler getContentResponseHandler =
new BlockingGetContentResponseHandler();

taskClient.getContent(documentContentId, getContentResponseHandler);

return getContentResponseHandler.getContent();
}
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3. Re: JBPM5 Content data problem

calca Sep 8, 2011 4:22 PM (in response to sroot)

If I don't remember wrong, if you evaluate this expresion:
        <targetRef>_12_ContentInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression">#{transportMap}</from>
          <to xsi:type="tFormalExpression">_12_ContentInput</to>
        </assignment>

It is converted to string.

You could try this one:
         <sourceRef>transportMap</sourceRef>
        <targetRef>_12_ContentInput</targetRef>

Demian
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4. Re: JBPM5 Content data problem

calca Sep 8, 2011 4:25 PM (in response to calca)

I think in
https://github.com/droolsjbpm/jbpm/blob/master/jbpm-flow/src/main/java/org/jbpm/workflow/instance/node/WorkItemNodeInstance.java
in line 170, resolves the variable into string. I don't know why
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5. Re: JBPM5 Content data problem

sroot Sep 8, 2011 4:43 PM (in response to calca)

Hmmmm, so does that mean that you really can't have anything other than a String as a process variable if you want to be able to later retrieve and display it from the Content of a Task?

Note that I am using the WSHumanTaskHandler and in my custom task handler just before the User Task I set my Map on a resuts map and then pass the results Map when I complete the workItem:

Map<String, Object> resultsMap = new HashMap<String, Object>();
resultsMap.put("MYMAP", myMap);
resultsMap.put("OTHERSTUFF", otherStuff);
workItemManager.completeWorkItem(workItem.getId(), resultMap);

The next step is User Task and I then attemtpt to retrieve the original Map from Task Content.
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6. Re: JBPM5 Content data problem

calca Sep 8, 2011 6:22 PM (in response to sroot)

No, it does not mean so..
If you use the expresion assignment(<from xsi:type="tFormalExpression">#{transportMap}</from>), it is resolved as an string, but if you map your process variable like this
         <sourceRef>transportMap</sourceRef>
        <targetRef>_12_ContentInput</targetRef>
I think should work.

You can check for example here:
https://github.com/Salaboy/emergency-service-drools-app/blob/master/emergency-service-core/src/main/resources/processes/procedures/DefaultHeartAttackProcedure.bpmn

To see how that parameters to the user task are sent.
For example,
<dataInputAssociation>
        <sourceRef>emergency</sourceRef>
        <targetRef>_6_emergencyInput</targetRef>
      </dataInputAssociation>

You can also check this post:
http://dcalca.wordpress.com/2011/05/06/variables-in-jbpm5-human-tasks/

Demian
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7. Re: JBPM5 Content data problem

sroot Sep 8, 2011 7:00 PM (in response to calca)

Thanks Demian!
That was extremley helpful.
I have it working now.
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