Mapping LookupAPI- Error closing accessor

Question

Hi All,
We are using Mapping Lookup API to get some data from the ABAP stack.
We are using it in a userdefined function.
However we are getting foll error after the value is fetched :
Error while closing accessor Technical error when calling an adapter remotely. The HMI method with the ID close was called with an incorrect session status. The system accessor object is missing.
Does anybody know wht is this about?
Any help would be appreciated.
Regards,
Sulakshana

Answer 1

I really could not make out what the problem was...your code was working correctly for me...i used the RFC FM STFC_CONNECTION to test....
since you were getting the error saying system accessor missing..it might bw worth while trying to use the system accessor instead of the rfc accessor.....
pls se the changes to be made in BOLD.
String rfcOutput = "";
MappingTrace importanttrace;
importanttrace = container.getTrace();
// filling the string with  RFC-XML
String sRfcxml = "<?xml version="1.0" encoding="UTF-8"?><ns0:STFC_CONNECTION xmlns:ns0="urn:sap-com:document:sap:rfc:functions"><REQUTEXT>TEST ME</REQUTEXT></ns0:STFC_CONNECTION>";
<b>SystemAccessor accessor = null;</b> ByteArrayOutputStream out = null;
try {
// 1. Determine a channel (Business system, Communication channel)
Channel channel = LookupService.getChannel("BS_DEV_XI_401_NA","CC_RFCXI401NA");
// 2. Get a RFC accessor for a channel. accessor = LookupService.getRfcAccessor(channel);
<b>accessor = LookupService.getSystemAccessor(channel);</b>
<b>accessor.setOperationName("STFC_CONNECTION");
accessor.setOperationNamespace("urn:sap-com:document:sap:rfc:functions");</b>
// 3. Create a xml input stream representing the function module request message.
InputStream inputStream = new ByteArrayInputStream(sRfcxml.getBytes());
// 4. Create xml payload
XmlPayload payload = LookupService.getXmlPayload(inputStream);
// 5. Execute lookup.
Payload rfcResult = accessor.call(payload);
InputStream in = rfcResult.getContent();
out = new ByteArrayOutputStream(1024);
byte[] buffer = new byte[1024];
for (int read = in.read(buffer); read > 0; read = in.read(buffer))
      out.write(buffer, 0, read);
importanttrace.addInfo(out.toString());
rfcOutput = out.toString();
} catch(LookupException e)
     importanttrace.addWarning("Error while lookup " + e.getMessage() );
                                    return e.toString();   
} catch(IOException e)
      importanttrace.addWarning("Error " + e.getMessage() );
                                    return e.toString();
finally {
if (out!=null)
try {
      out.close();
catch (IOException e)
      importanttrace.addWarning("Error while closing stream " + e.getMessage() );
                                    return e.toString();
// 7. close the accessor in order to free resources.
if (accessor!=null)
try      {
     accessor.close();
catch (LookupException e)
      importanttrace.addWarning("Error while closing accessor " + e.getMessage() );
     //e.printStackTrace();
     //importanttrace.addWarning("Error while closing " + e.printStackTrace() );
     importanttrace.addWarning("Error while  " + e.getRootCause());
     importanttrace.addWarning("Error while  " + e.getCause());
                                    return e.toString();
//returning the result – RFC-XML.response
//final String STARTTAG = "<Y_FILENAME>";
//final String ENDTAG = "</Y_FILENAME>";
//int Y_FILENAME_START  = rfcOutput.indexOf(STARTTAG);
//int Y_FILENAME_END = rfcOutput.indexOf(ENDTAG);
//Extract generation Number
//String generationNumber = rfcOutput.substring(Y_FILENAME_START+STARTTAG.length() , Y_FILENAME_END);
//result.addValue(generationNumber);
return rfcOutput;