Newby: Copy Rule returns Error

Question

Hi,
I am new to Oracle BPEL Process Manager.
I successfully a hello world BPEL process and now I am trying to do something a bit more intereseting.
I successfully invoked a partner link and it returned this:
<getManagerResponse xmlns="http://service">
<getManagerReturn>
<contactid>4876</contactid>
<email>[email protected]</email>
<firstname>Thierry</firstname>
<lastname>B</lastname>
</getManagerReturn>
</getManagerResponse>
Right after the invoke statement, I created an assign which is supposed to copy the lastname to the output.
<invoke name="invoke-2" partnerLink="ws_prime" portType="nsxml0:Service" operation="getManager" inputVariable="ws_getManager_In" outputVariable="ws_GetManager_Out"/>
                              <assign name="assign-5">
                                   <copy>
                                        <from expression="bpws:getVariableData('ws_GetManager_Out','parameters','/nsxml0:getManagerResponse/nsxml0:getManagerReturn/nsxml1:firstname')"></from>
                                        <to variable="output" part="payload" query="/tns:MainResponse/tns:lastname"/>
                                   </copy>
                              </assign>
The whole process works fine before the assign statement. Once the BPEL engine reaches it, it displays an error message saying:
Error in te expression <from> on line 62. The result returned for the XPATH expression is empty.
"bpws:getVariableData('ws_GetManager_Out','parameters','/nsxml0:getManagerResponse/nsxml0:getManagerReturn/nsxml1:firstname')".
Make sure that this result is not empty.
The Xpath expression was created the generator shipped with Oracle BPEL Designer.
What am I doing wrong here?
Any help would help a lot!
Thanks!

Answer 1

you copied firstname to lastname: ;-)
<from expression="bpws:getVariableData('ws_GetManager_Out','parameters','/nsxml0:getManagerResponse/nsxml0:getManagerReturn/nsxml1:firstname')"></from>
<to variable="output" part="payload" query="/tns:MainResponse/tns:lastname"/>
But this is not the real problem. I think your namespace nsxml1 for firstname does not match the namespace of the xmlns="http://service"