How to get Error Trace on Linux

Question

Hi All,
I am trying to run my JAR ( A simple JAR that uses JCO) on Linux SUSE 10, when I run it, it just gives me the following error, there is no trace.
How can I get the full trace. Please help.
This is what im doing and the next line is the error message.
dsadm@mach1:/opt/IBM/media/SAP/sapjco> java -jar ditest1.jar
The java class is not found: com/sap/mw/jco/JCO$Exception
dsadm@mach1:/opt/IBM/media/SAP/sapjco>
This is the (ONLY) class file in the JAR, I exported my JAVA project from NWDS as a JAR file.
package com.test;
* Conn.java
* Property of SAP AG, Walldorf
* (c) Copyright SAP AG, Walldorf, 2000-2003.
* All rights reserved.
import com.sap.mw.jco.*;
public class Conn {
  // The MySAP.com system we gonna be using
  static final String SID = "R3";
  // The repository we will be using
  com.sap.mw.jco.IRepository repository;
  public Conn()
     System.out.println("**** DI11 *****");
         this.buildConnection();
       System.out.println("**** DI 22*****");
  public void buildConnection(){
     try {
               System.out.println("**** DI2 *****");
            // Add a connection pool to the specified system
            //    The pool will be saved in the pool list to be used
            //    from other threads by JCO.getClient(SID).
            //    The pool must be explicitely removed by JCO.removeClientPool(SID)
          com.sap.mw.jco.JCO.addClientPool( SID,         // Alias for this pool
                                    10,          // Max. number of connections
                                    "040",       // SAP client
                                    "testuser",   // userid
                                    "pass",  // password
                                    "EN",        // language
                                    "ipaddress",// host name
                                    "xx" );
            // Create a new repository
            //    The repository caches the function and structure definitions
            //    to be used for all calls to the system SID. The creation of
            //    redundant instances cause performance and memory waste.
            repository = com.sap.mw.jco.JCO.createRepository("MYRepository", SID);
          catch (Exception ex) {
            System.out.println("Caught an exception: \n" + ex.getMessage());
  // Retrieves and prints information about the remote system
  public void systemInfo()
    try {
      // Get a function template from the repository
      IFunctionTemplate ftemplate = repository.getFunctionTemplate("RFC_SYSTEM_INFO");
      // if the function definition was found in backend system
      if(ftemplate != null) {
        // Create a function from the template
        JCO.Function function = ftemplate.getFunction();
        // Get a client from the pool
        JCO.Client client = JCO.getClient(SID);
        // We can call 'RFC_SYSTEM_INFO' directly since it does not need any input parameters
        client.execute(function);
        // The export parameter 'RFCSI_EXPORT' contains a structure of type 'RFCSI'
        JCO.Structure s = function.getExportParameterList().getStructure("RFCSI_EXPORT");
        // Use enumeration to loop over all fields of the structure
        System.out.println("System info for " + SID + ":\n" +
        for (JCO.FieldIterator e = s.fields(); e.hasMoreElements(); ) {
          JCO.Field field = e.nextField();
          System.out.println(field.getName() + ":\t" + field.getString());
        }//for
        System.out.println("\n\n");
        // Release the client into the pool
        JCO.releaseClient(client);
      else {
         System.out.println("Function RFC_SYSTEM_INFO not found in backend system.");
     catch (JCO.Exception ex) {
       System.out.println("Caught an exception: \n" + ex);
  // Retrieves and displays a sales order list
  public void salesOrders()
     JCO.Client client = null;
    try {
      // Get a function template from the repository
      IFunctionTemplate ftemplate = repository.getFunctionTemplate("BAPI_SALESORDER_GETLIST");
      // if the function definition was found in backend system
      if(ftemplate != null) {
          // Create a function from the template
          JCO.Function function = ftemplate.getFunction();
          // Get a client from the pool
          client = JCO.getClient(SID);
          // Fill in input parameters
          JCO.ParameterList input = function.getImportParameterList();
          input.setValue("0000001200", "CUSTOMER_NUMBER"   );
          input.setValue(      "1000", "SALES_ORGANIZATION");
          input.setValue(         "0", "TRANSACTION_GROUP" );
          // Call the remote system
          client.execute(function);
          // Print return message
          JCO.Structure ret = function.getExportParameterList().getStructure("RETURN");
          System.out.println("BAPI_SALES_ORDER_GETLIST RETURN: " + ret.getString("MESSAGE"));
          // Get table containing the orders
          JCO.Table sales_orders = function.getTableParameterList().getTable("SALES_ORDERS");
          // Print results
          if (sales_orders.getNumRows() > 0) {
            // Loop over all rows
            do {
              System.out.println("-----------------------------------------");
              // Loop over all columns in the current row
              for (JCO.FieldIterator e = sales_orders.fields(); e.hasMoreElements(); ) {
                 JCO.Field field = e.nextField();
                 System.out.println(field.getName() + ":\t" + field.getString());
              }//for
            } while(sales_orders.nextRow());
          else {
            System.out.println("No results found");
          }//if
      else {
         System.out.println("Function BAPI_SALESORDER_GETLIST not found in backend system.");
       }//if
    catch (Exception ex) {
      System.out.println("Caught an exception: \n" + ex);
    finally {
       // Release the client to the pool
      JCO.releaseClient(client);
  protected void cleanUp() {
    JCO.removeClientPool(SID);
  public static void main(String[] argv)
    Conn e = new Conn();
  e.systemInfo();
  e.salesOrders();
  e.cleanUp();
This is standard SAP code, please help on how can I get the complete error trace on linux.

Answer 1

You do not require RFCSDK to build a jaava application that uses JCO on LINUX.