Portal application connecting backend SAP R/3 system

Question

Hi All,
           I am developing one portal application through NWDS. It's JSPDYNPage component.The applications functionality is basicaly is to connect it to backend SAP R/3 system & fetch some data in aparticular table & display that data in a tableview format on one JSP& also when i click any row of the tableview then details of that row should get displayed on the next JSP. So i reached till develpoing a code that connnects to Backend SAP R/3.(Basicaly coding of connection part is done). Now i need to test this code, to check whether it is fine or not? NWDS doesnt give nay error, not compile also or not runtime error also. It simply shows the output as a blank page, where it is supposed to display one line of text in textview(i coded this in my JSP).But as i said it displays a blank page. i tried to debug the application , but debugging also not worked.I performed the debugging twice in right way. The code was not debugged, it run the same way as it normally runs when debugging is off & shown the blank page. I also have done all the the settings or prerequisites for debugging properly. I am stuck at this point now.search many documents , but no relevant help has been received. Can anyonehlep me with this. i am putting below the code for JSP, JSPDYNPAGE component as well as portalapp.xml. Can anyone guide me with this, whhere i am making mistake? what should i change in this?
JSPDYNPAGE code
package com.lti.portal;
//import java.util.ArrayList;
import com.sapportals.htmlb.*;
import com.sapportals.htmlb.enum.*;
import com.sapportals.htmlb.event.*;
import com.sapportals.htmlb.page.*;
import com.sapportals.portal.htmlb.page.*;
import com.sapportals.portal.prt.component.*;
import java.util.ArrayList;
import com.sap.mw.jco.IFunctionTemplate;
import com.sap.mw.jco.JCO;
import com.sun.corba.se.internal.core.Response;
public class Connection_R3 extends PageProcessorComponent {
public DynPage getPage(){
return new Connection_R3DynPage();
public static class Connection_R3DynPage extends JSPDynPage{
private Conn_R3 myBean = null;
public JCO.Client mConnection;
public JCO.Repository mRepository;
public ArrayList al = new ArrayList();
public String output;
public String Ans;
public static String BEAN_KEY="myBean";
public void doInitialization(){
IPortalComponentRequest request =(IPortalComponentRequest) this.getRequest();
IPortalComponentContext context = request.getComponentContext();
IPortalComponentProfile profile = context.getProfile();
//create & initialize the bean.
Conn_R3 test_bean= new Conn_R3();
test_bean.setans("3");
// put the bean into application context.
context.putValue(BEAN_KEY,test_bean);
conn();
//IPortalComponentResponse res = (IPortalComponentResponse)this.getResponse();
//for(int i=0;i<al.size();i++)
//res.write(" "+al.get(i).toString());
public void doProcessAfterInput() throws PageException {
public void doProcessBeforeOutput() throws PageException {
this.setJspName("Connection_R3.jsp");
public ArrayList conn() {
IPortalComponentRequest request =(IPortalComponentRequest) this.getRequest();
IPortalComponentContext context = request.getComponentContext();
IPortalComponentProfile profile = context.getProfile();
Conn_R3 sample_bean = new Conn_R3();
sample_bean.setans("5");
//context.putValue(BEAN_KEY, sample_bean);
//r3-accessing
//connect_to_r3();
try {
// Change the logon information to your own system/user
mConnection = JCO.createClient("800", // SAP client
"********", // userid
"******", // password
null, // language
"*******", // application server host name
"**"); // system number
mConnection.connect();
//System.out.println(mConnection.getAttributes());
mRepository = new JCO.Repository("ABC", mConnection);
} catch (Exception ex) {
ex.printStackTrace();
System.exit(1);
JCO.Function function = null;
JCO.Table codes = null;
try {
function = this.createFunction("ZSAMPLE");
if (function == null) {
System.out.println("ZSAMPLE" + " not found in SAP.");
System.exit(1);
String num1 = "7";
String num2 = "9";
//String ans;
function.getImportParameterList().setValue(num1,"My_import");
function.getImportParameterList().setValue(num2, "My_Import");
mConnection.execute(function);
Object name =function.getExportParameterList().getValue(Ans);
output=name.toString();
sample_bean.setans(output);
//sample_bean.setans(output)
//al.add(name);
//store values into strings
//pushing of values we get from r3 into awt
} catch (Exception ex) {
ex.printStackTrace();
System.exit(1);
disconnect_r3();
return al;
public void connect_to_r3() {
public JCO.Function createFunction(String name) throws Exception {
try {
IFunctionTemplate ft =
mRepository.getFunctionTemplate(name.toUpperCase());
if (ft == null)
return null;
return ft.getFunction();
} catch (Exception ex) {
throw new Exception("Problem retrieving JCO.Function object.");
public void disconnect_r3() {
mConnection.disconnect();
//**********************<b>Code for BEAN</b>****************************
package com.lti.portal;
import java.io.Serializable;
public class Conn_R3 implements Serializable {
public String answer;
public void setans(String a)
answer=a;
public String getans()
return answer;
///////////////////////<b>Code for JSP</b>*****************************
><%@ taglib uri= "tagLib" prefix= "hbj" %>
<jsp:useBean id="myBean" scope="application" class="com.lti.portal.Conn_R3" />
<hbj:content id="myContext" >
<hbj:page title="PageTitle">
<hbj:form id="myFormId" >
<hbj:textView
id="Welcome_message"
text="<%=myBean.getans()%>"
design="STANDARD" >
</hbj:textView>
</hbj:form>
</hbj:page>
</hbj:content>
/////////////////////////////////<b>Portalapp.xml</b>*****************************************
application>
  <application-config>
    <property name="PrivateSharingReference" value="com.sap.portal.htmlb"/>
  </application-config>
  <components>
    <component name="Address_comp">
      <component-config>
        <property name="ClassName" value="com.lti.portal.Address_comp"/>
      </component-config>
      <component-profile>
      <property name="tagLib" value="/SERVICE/htmlb/taglib/htmlb.tld"/>
      </component-profile>
    </component>
  </components>
  <services/>
</application>

Answer 1

Hi,
   Do onething, please refer this <a href="http://www.i-barile.it/SDN/JCoTutorial.pdf">JCo Tutorial</a> as well as <a href="http://www.apentia-forum.de/viewtopic.php?t=1962&sid=9ac1506bdb153c14edaf891300bfde25">Link</a> also.
Regards,
Venkatesh. K
/* Points are Welcome */