RFC Call in Message Mapping

Question

Hi there
I am trying to do a table lookup from XI in my message mapping by calling an remote RFC. The return values must return ALL the value for a specific column. The code I have here returns a blank value. Can someone see what my problem may be?
My variables for my UDF is:
public String UDF_RFC(String DBTABLE,String MATNR,String FIELDS,String businessSystem,String communicationChannel,Container container)
And my Code:
"My code appears to mess up my message structure, I will attach it in a responce..
Thanks,
Jan
Edited by: Jan de Lange on Sep 16, 2009 11:09 AM
Edited by: Jan de Lange on Sep 16, 2009 11:09 AM

Answer 1

// declare parameters
String returnValue = "";
String rfcXML = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><ns0:ZINT_XI_GET_SITES xmlns:ns0=\"urn:sap-com:document:sap:rfc:functions\"><LT_SITES><item><WERKS></WERKS></item></LT_SITES></ns0:ZINT_XI_GET_SITES>";
AbstractTrace trace = container.getTrace();
RfcAccessor accessor = null;
ByteArrayOutputStream out = null;
try
// 1. Determine a communication channel (Business system + Communication channel)
Channel channel = LookupService.getChannel(businessSystem,communicationChannel);
// 2. Get a RFC accessor for the channel.
accessor = LookupService.getRfcAccessor(channel);
// 3. Create an XML input stream that represents the RFC request message.
InputStream inputStream = new ByteArrayInputStream(rfcXML.getBytes());
// 4. Create the XML Payload
XmlPayload payload = LookupService.getXmlPayload(inputStream);
// 5. Execute the lookup.
Payload result = null;
result = accessor.call(payload);
InputStream in = result.getContent();
// 6. Create a DOM structure from the input XML
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(in);
NodeList      nodelist = document.getElementsByTagName("*");
Node          node;
Element       element;
NamedNodeMap  nnm = null;
String attrname;
String attrval;
int    i, len;
len = nodelist.getLength();
for (int j=0; j < len; j++) {
            element = (Element)nodelist.item(j);
            System.out.println(element.getTagName() + ":");
            nnm = element.getAttributes();
        if (nnm != null) {
            for (i=0; i<nnm.getLength(); i++) {
                node = nnm.item(i);
                attrname = node.getNodeName();
                attrval  = node.getNodeValue();
                returnValue += attrname + " = " + attrval + "##";
// 7. To free resources, close the accessor..
if (accessor!=null) {
try {
accessor.close();
} catch (LookupException e) {
trace.addWarning("Error while closing accessor " + e.getMessage() );
} catch (Exception e) {
trace.addWarning("Error" + e);
// 8. return a single id value to the message mapping
return returnValue;