Portal application connecting to backend R/3 system

Question

Hi All,
           i am developing one portal application through NDS(Netweaver Developer Studio) that connects to backend SAP R/3 system & fetches some data in R/3 system. I started working on it & developed some code, which i want to test whether it is working fine or not.I:e- code to connect to SAP R/3, but when i run the application it doesnt give any error but also it doesnt show any output which it should display(value of output parameter of RFC). Below is the code for component, code for JSP & code for bean. Can any one tell me what is the error in this? or why i am not getting the output i desired. All the connection parameters supplied in the coding are correct. Now below i mentioned these parameters as *, bt in actual i have mentioned them correct. I checked them twice, they are fine.
Code for Component
[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();
Code for BEAN
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;
Code for JSP
<%@ 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>

Answer 1

Hi Chetan,
Connection to R/3 systems through Portal can be done in many ways. Since you have mentioned that you are using jspdynpage then its better that you use JCo for connecting to R/3 system.
U can write the JCo code using the jspdynpage component. I hope you have pdfs related to JCO. Incase u dont have then give me you mail id. OK
Another approach could be developing a web dynpro java application that access a r/3 table using a BAPI. You can a dynpro model to easily connect to R/3 system.
Just develop an iview based on this web dynpro application. And finally navigate to this iview through your jspdynpage.
I hope this helps you in some way
Regards,
Prasanna