Exception in executing JCo code

Question

I am getting following exception
Failed to get system null
while executing following code----
package com.sap.nwrig.demo;
import javax.resource.ResourceException;
import com.sap.security.api.umap.NoLogonDataAvailableException;
import com.sapportals.portal.prt.component.*;
import com.sapportals.portal.prt.runtime.PortalRuntime;
import com.sapportals.portal.ivs.cg.ConnectionProperties;
import com.sapportals.portal.ivs.cg.IConnectorGatewayService;
//import com.sapportals.portal.ivs.cg.IConnectorService;
import com.sapportals.connector.ConnectorException;
import com.sapportals.connector.connection.IConnection;
import com.sapportals.connector.execution.objects.IQuery;
import com.sapportals.connector.execution.objects.InvalidQueryStringException;
import com.sapportals.connector.execution.objects.QueryExecutionException;
import com.sapportals.connector.execution.structures.IRecordMetaData;
import com.sapportals.connector.execution.structures.IRecordSet;
import com.sapportals.connector.metadata.CapabilityNotSupportedException;
public class ConnectorExample extends AbstractPortalComponent
    public IConnection connection;
     IQuery query=null;
     public void doContent(IPortalComponentRequest request, IPortalComponentResponse response)
    {//docontent start
          IConnectorGatewayService cgService =
          (IConnectorGatewayService)PortalRuntime.getRuntimeResources().getService(IConnectorGatewayService.KEY);
          ConnectionProperties cp =
           new ConnectionProperties(request.getLocale(),request.getUser());
          try {
               connection =cgService.getConnection("Pubs",cp);
          } catch (ConnectorException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (NoLogonDataAvailableException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          try {
               query = connection.newQuery();
          } catch (CapabilityNotSupportedException e1) {
               // TODO Auto-generated catch block
               e1.printStackTrace();
      String qstr = "SELECT * FROM BAPI_SALESORDER_CHANGE ";
      try {
          boolean success = query.execute(qstr);
           catch (QueryExecutionException e2)
          // TODO Auto-generated catch block
            e2.printStackTrace();
            catch (ConnectorException e2)
          // TODO Auto-generated catch block
              e2.printStackTrace();
            catch (InvalidQueryStringException e2)
          // TODO Auto-generated catch block
               e2.printStackTrace();
          IRecordSet rs = null;
          try {
               rs = query.retrieveRecordSet();
          } catch (ConnectorException e3) {
               // TODO Auto-generated catch block
               e3.printStackTrace();
          IRecordMetaData rsMD = null;
          try {
               rsMD = rs.retrieveMetaData();
          } catch (ConnectorException e4) {
               // TODO Auto-generated catch block
               e4.printStackTrace();
          response.write("<table><tr>");
          int columnCount = 0;
          try {
               columnCount = rsMD.getColumnCount();
          } catch (ConnectorException e5) {
               // TODO Auto-generated catch block
               e5.printStackTrace();
          for (int index = 1; index <= columnCount; index++)
               try {
                    response.write("<th>"+ rsMD.getColumnLabel(index) + "</th>");
               } catch (ConnectorException e6)
                    // TODO Auto-generated catch block
                    e6.printStackTrace();
             response.write("</tr>");
                     try {
                         while (rs.next())
                                  response.write("<tr>");
                                  for (int index = 1; index <= columnCount; index++)
                                       response.write("<td>" + rs.getString(index)+ "</td>");
                                  response.write("</tr>");}
                    } catch (ConnectorException e6) {
                         // TODO Auto-generated catch block
                         e6.printStackTrace();
                    }response.write("</table>");    
               try {
                    connection.close();
               } catch (ResourceException e7) {
                    // TODO Auto-generated catch block
                    e7.printStackTrace();
    }//do content end
pls help me dissolve this error

Answer 1

Is "Pubs" marked as the default alias for the System?
Sap help maybe
http://help.sap.com/saphelp_nw04/helpdata/en/30/a0f17aacb34b108b39a96acc33da3f/content.htm
But the error says NoLogonDataAvailableException so it must have something to do with this.
Does your request.getUser() return a user?
br Peter
Message was edited by:
        Peter