Problem with connecting from Netweaver Session Bean to SAP R/3

Question

Hi,
i just want a connection to RFC in SAP R/3 and with help of sap ("Proxy generation" etc) and wizard in NWDS i get the rfc. Now i want to connect and use it (like in handbook) but: Every time i create and use jcoclient.connect() system gets an error like:
"Class File Editor
Source not found
The jar file jrfc.jar has no source attachment."
I have add all files that are used to "Used DCs" or bind library into projekt as "Third party library", but the error is still there.
Any idea? Do i have to make something else? Some failure made?
thx
Here is text for connection:
Created on 26.06.2008
To change the template for this generated file go to
Window>Preferences>Java>Code Generation>Code and Comments
package com.XXXXXXXXXXXXXXXXX;
import com.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX;
import com.sap.aii.proxy.framework.core.ApplicationFaultException;
import com.sap.aii.proxy.framework.core.SystemFaultException;
import com.sap.mw.jco.JCO;
@author XXXXX
To change the template for this generated type comment go to
Window>Preferences>Java>Code Generation>Code and Comments
public class MyMainClass extends Object
     public static void main(String[] args)
          throws ApplicationFaultException, SystemFaultException
          JCO.Client jcoclient =
               JCO.createClient(
                    "XXX", //Client
                    "XXX", //User
                    "XXX", //Password
                    "XXX", //Language
                    "XXX", //Server
                    "XXX", //System
                    "XXX"); //Group
          jcoclient.connect();
          jcoclient.disconnect();
Edited by: Torsten on Aug 27, 2008 10:43 AM
Where can we download SAP NW7.0 (2004s) as Java Trial for testing? We only find ABAP Trial... Link? thx

Answer 1

So we tested some things that are described in the SDN or by SAP with Connectors.
We tested JCO version 2.0.12, 2.1.18 and 3.0 in J2EE Projects in netweaver and in Eclipse (Standalone).
For version 2.0.12 there is a failure that this version is not compatible with the other things in netweaver.
This version is for standalone and integrated sytems.
For version 2.1.18 is only described as standalone and so failure happened in netweaver that other classes are coruppted or missed. The internal test in "content administrator" (Ping and Test) do not work and had the same error.
For version 3.0 (that displace the other two versions) there is many to do in  settings and coding that we do not have tested yet because project is not that small to write it for JCO 3.0 only for testing. When we only displaced files in netweaver the server do not start any more.
So:
Is there a way to call R/3 from session bean and 1. create an JCO client or 2. add a client to the "standard" pool of netweaver to use it?
Any ideas? help? links?
Project have to be complete in september...
Our combi is SAP Netweaver 2004 SP21 on Windows XP SP2 / Server 2003 Standard SP1 with JVM 1.4.2_16... need of any more info?
thx