JCO from Message Mapping in XI

Question

I'm trying to create a function in XI Message Mapping that saves some information in a XI DB table using JCO.
I've created DB table ZEDI with Fields A,B,C,D. My function is following:
imports:java.lang.String;java.io.ByteArrayInputStream;java.io.InputStream;com.sap.mw.jco.*;
public String WriteTable(String ISA,String GS,Container container){
//write your code here
String DBTABLE = "ZEDI";
String sapClient = "200";
String hostName = "10.1.10.81";
String systemNumber = "00";
String userName = "DBuser";
String password = "DBpass";
String language = "EN";
int i     = 0;
JCO.Repository mRepository;
JCO.Client mConnection = JCO.createClient(
               sapClient,
               userName,
               password,
               language,
               hostName,
               systemNumber );
// connect to SAP
mConnection.connect();
// create repository
mRepository = new JCO.Repository( "GenericLookup", mConnection );
// create function template to select data from any table
JCO.Function function = null;
IFunctionTemplate ft = mRepository.getFunctionTemplate("ZEDI");
function = ft.getFunction();
//JCO.ParameterList lookupFieldPos  = function.getImportParameterList();
JCO.Table FieldPos = function.getTableParameterList().getTable("ZEDI");
// Pass function parameters
FieldPos.setValue(ISA,"A");
FieldPos.setValue(GS,"B");
mConnection.execute(function );
mConnection.disconnect();
return ISA;
Message Mapping test returns Exception:[java.lang.NullPointerException].
Do you have any idea what do I need to change to make it working?
Thanks!
Naycho

Answer 1

Hi Naycho
You have created a SAP table, but you have to create ABAP Function Module (RFC) with import /export parameters to access tables via JCO.
The null pointer exception is because - IFunctionTemplate ft = mRepository.getFunctionTemplate("ZEDI");
is searching for a function not table name.
hope this helps
Regards
Prahllad