Error in Dynamic Human Task Assignment

Question

Hi,
I am trying to assign task dynamically using Xpath but i keep getting error when i deploy & run the BPEL process.
I tried using orcl:create-nodeset-from-delimited-string(') but it returns the error
"Error while processing xpath expression, the reason is message can't be null.
Please verify the xpath query."
I tried using Qname as 'task:assignee' as well as '/task:task/task:systemAttributes/task:assigneeUsers/task:id' but it returns the same error!
I would really appreciate if someone can tell me how can I assign user dynamically!

Answer 1

The trick is that the user id to which you will assign the task should be present somewhere within your payload. When editing the task file, the dynamic user xpath expression you enter should be pointing to this element which contains the user id. That's all indeed.
By the way, "message can't be null" error may occur if you are not setting the payload instance correctly. You specify the message or element types for the payload while editing the task file, however you should specify real object instances for the payload elements in the dialog box which opens when you double click the human task activity in the BPEL diagram.
Hope this helps..
Serkan