How to set values to bpel variables from Java

I have a java class to create files and populate some contents into it. On success it returnes "File Created"
I used the following code to achieve it :-
WriteFiles objWriteFiles=new WriteFiles();
String para=((oracle.xml.parser.v2.XMLElement)getVariableData("inputVariable","payload","/client:FileTestProcessRequest/client:HO_ORG_ID")).getFirstChild().getNodeValue();
String result=objWriteFiles.writeHeaderInfo(para);
(writeHeaderInfo is a method in my java class)
addAuditTrailEntry(result);
I works fine..Now I want to assign this reult value to a bpel variable .. I tried doin it like below:-
setVariableData("outputVariable","payload","/client:FileTestProcessResponse/client:result" , result)
but its not working...I get a fault ...
Can anyone help me out...
Thanks,
Githa.R.S

In this example :
   
   <bpelx:exec name="invokeJavaExec" language="java" version="1.4">
      <![CDATA[
         EmployeeStatus e = new EmployeeStatus();
            String firstName = ((Element)getVariableData(
                             "EmployeeTravelStatusRequest", "employee",
                             "/employee/FirstName")).getNodeValue();
            String lastName = ((Element)getVariableData(
                               "EmployeeTravelStatusRequest", "employee",
                               "/employee/LastName")).getNodeValue();
            String empStatus = e.getTravelStatus(firstName, lastName);
            addAuditTrailEntry("Employee status is: " + empStatus);
            setVariableData("EmployeeTravelStatusResponse", "travelClass",
                         "/travelClass", empStatus);
      ]]>
   </bpelx:exec>they dont use namespaces in the xpath-expression, can you try that ?

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