Faults in BPEL when invoked from a Custom built Web Application

Question

Hello there,
I have developed a BPEL flow for a HealthCare demo and it works fine and all is well when it is invoked from the BPEL Console's initiate screen.
I developed a webapplication to invoke the same (using the regular com.collaxa api for invokation of any BPEL process). It invokes the BPEL successfully and I can see the whole Payload in the 'receiveInput' section of the BPEL Flow. But the very First 'Assign' in which i just assign a text string as a default value to an input element faults out stating that the 'to' field is a 'zero node'... The assign stage also shows the payload with all values in it. But it errors out...
here is the payload in the 'receiveInput' stage:
<inputVariable>
<part name="payload" >
<HealthCareWorkFlowProcessRequest>
<enduser_name>pavan</enduser_name>
<enduser_phone_number>08046521345</enduser_phone_number>
<enduser_username>pkvedam</enduser_username>
<enduser_email_id>[email protected]</enduser_email_id>
<problem_desc>cancer</problem_desc>
<prob_relates_to>onchology</prob_relates_to>
<doctor_assigned/>
<doctor_assigned_email_id/>
<proposed_date>13-10-2006</proposed_date>
<proposed_time>09:00</proposed_time>
<proposed_duration>01:00</proposed_duration>
<patient_comments>swelling in the arm pit</patient_comments>
<receptionist_comments/>
<doctor_comments/>
<receptionist_username>employee</receptionist_username>
<receptionist_email_id>[email protected]</receptionist_email_id>
</HealthCareWorkFlowProcessRequest>
</part>
</inputVariable>
Here is the ASSIGN stage errors out (copied to clipboard):
[2006/10/14 10:44:54]
Error in <assign> expression: <to> value is empty at line "46". The XPath expression:
"/child::client:HealthCareWorkFlowProcessRequedst/child::client:receptionist_username"
returns zero node, when applied to document shown below:
<HealthCareWorkFlowProcessRequest>
<enduser_name>pavan</enduser_name>
<enduser_phone_number>08046521345</enduser_phone_number>
<enduser_username>pkvedam</enduser_username>
<enduser_email_id>[email protected]</enduser_email_id>
<problem_desc>cancer</problem_desc>
<prob_relates_to>onchology</prob_relates_to>
<doctor_assigned/>
<doctor_assigned_email_id/>
<proposed_date>13-10-2006</proposed_date>
<proposed_time>09:00</proposed_time>
<proposed_duration>01:00</proposed_duration>
<patient_comments>swelling in the arm pit</patient_comments>
<receptionist_comments/>
<doctor_comments/>
<receptionist_username>employee</receptionist_username>
<receptionist_email_id>[email protected]</receptionist_email_id>
</HealthCareWorkFlowProcessRequest>
<selectionFailure>
<part name="summary" >
<summary>XPath query string returns zero node. According to BPEL4WS spec 1.1 section 14.3, The assign activity &lt;to&gt; part query should not return zero node. Please check the BPEL source at line number "46" and verify the &lt;to&gt; part xpath query. </summary>
</part>
</selectionFailure>

Answer 1

oops... sorry... I had typed it in as there is no way to copy that 'error message' on to the clipboard from the BPEL FLOW depiction.
it must have read 'HealthCareWorkFlowProcessRequest'...
the problem is not with the typo... :(
Am not able to find the root cause... but the flow fails when invoked from my web application...