Asynchronous process learnings: Why are callbacks skipped?

Just wanted to log my learnings about asynchronous processes and callbacks.
I was trying to write a .NET client to invoke an asynchronous process and was not getting anywhere. The process was being invoked successfully but the callback wasn't happening. The visual flow in the console kept saying "skipped callback x on partner y". It appears this happens when the process does not recognize that the incoming invocation is conversational - in other words it does not find the WS-Addressing headers or if present does not understand it. You would notice the same behaviour when you invoke an asynchronous process from the console. This is expected behaviour because the console does not expose a callback.
So, if you are trying to invoke an asynchronous process from another platform and see the "skipped callback" message, the first place to check is your WS-Addressing headers. Is it present and specified properly? Is the WS-Addressing namespace correct? On the BPEL 2.0.11 version I was testing, newer WS-Addressing versions would not work. I had to switch back to the older "http://schemas.xmlsoap.org/ws/2003/03/addressing" version. Another strange problem I noticed was that it was expecting some bpel attributes such as rootID, parentID in the MessageID header. Without these it would throw a server fault.
It also helps to write a sample client process in BPEL to invoke the asynchronous process and log the request and callback messages (there are technotes on OTN that show how to do this). This can be compared with the messages produced by your client to debug any problems.
Hope this information is useful for interested people. I'm yet to test the behaviour on the 10g version. Will keep this thread updated when I do that.

The migration utility only processes transforms that are created by the user.  If a transform was part of the Data Quality installation, it will not be migrated because the equivalent transform will be installed as part of the Data Services installation. 
Please read the manual "DS Migration Considerations > Data Quality to Data Services Migration > How transforms migrate" for more details.
Regards,
George
Edited by: George Ruan on Nov 22, 2011 9:04 PM

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