Call RFC from java (j2ee) / call to j2ee from R/3

hello
i´ve browsed the forum for some time to find how to:
1.) call ejb from r/3 system via rfc
2.) call rfc enabled function modules on r/3 from within an j2ee enviroment
but i didn´t quite get it, because i was a bit confused about all the mentionend techniques
what i found out about
1.) use ejb (session bean) and jndi; configure RFC-Engine Service (we use sap webas)
2.) use jco / jca
(or all rfc enables rfm´s are available as web service, but didn´t find anything about this)
so my question:
are these the preferred techniques to connect j2ee (webAS) <-> r/3; if not are there any others, maybe easier methods?
and last but not least: are there any good online tutorials for this topic?
thanks in advance
franz

Just as a short partial reply.
The generic Java --> RFC method is JCO (it will work on older versions as well), you can think of it as a JDBC driver where R/3 is the database, it behaves very similar in many ways.
EJB development on SAP WAS is really not any different from EJB development on any other J2EE server. The deploy tool is superb. very easy to use and the JNDI registry, etc. are standard stuff...
ABAP to EJB calls, haven't looked at this in over a year now, but back then we did a Proof Of Concept based on information at http://help.sap.com and it did work indeed. The only thing was back then that you needed to do a few tweaks to get it to work properly.
As mentioned above, look at the JCO examples and then you can ask more specific questions once you get stuck.
Good Luck!
Cheers,
Kalle

Similar Messages

Call RFC using java procedure

Hi
How can I to use java procedure and call RFC for to access tables of SAP ?
Thank You

RFC? That term in the IT environment usually means "+Request For Comments+" and refers to Internet protocol and usage standards.
Do you perhaps means RPC (Remote Process/Procedure Calls)? Or something else?
Also, SAP is a company. Not a product. SAP has a product called R3. This runs inside a database.
Connecting from Java to a database typically requires nothing more than a JDBC driver. So why can't you use a JDBC driver and need to call the database (and access tables) using another method?

Problem while calling RFC in java

hi,
I writed a java program calling a batch input RFC. The RFC return an internal table which storing the system messages of the batch input process. My problem is:
When i debug the java program,the RFC excecuted and return the correct internal table to me.
But when i executed it not in debug mode, there is no batch input messages return to me.
My code is:
package com.hongta.com.z_delivery_bdc;
import com.sap.mw.jco.IFunctionTemplate;
import com.sap.mw.jco.JCO;
import com.sap.mw.jco.JCO.ParameterList;
@author Administrator
To change the template for this generated type comment go to
Window>Preferences>Java>Code Generation>Code and Comments
public class ConnectRFC extends Object {
     JCO.Client mConnection;
     JCO.Repository mRepository;
     String filePath;
     String BDCLOG;
     JCO.Function function;
     public void Connect1() {
          filePath =
               "C:
Documents and Settings
Administrator.3939200975DB4C5
desktop
cigaXY2008-12-15.xml";
          function = null;
          try {
               // Change the logon information to your own system/user
                    mConnection = JCO.createClient("610", // SAP client
          "xxxxxx", // userid
          "xxxxxx", // password
          null, // language
          "10.96.0.53", // application server host name
     "01"); // system number
      // mConnection.setAbapDebug(true);
               mConnection.connect();
               mRepository = new JCO.Repository("ARBsoft", mConnection);
          } catch (Exception ex) {
               ex.printStackTrace();
               System.out.println("jco connect failed");
                                        mConnection.disconnect();
               System.exit(1);
          //JCO.Table codes = null;
          try {
               function = this.createFunction("Z_BAPI_CONTRACT_BDC");
               if (function == null) {
                    System.out.println(
                         "Z_BAPI_contract_bdc" + " not found in SAP.");
                    if ( mConnection != null && mConnection.isAlive()) {
                         mConnection.disconnect();
                    System.exit(1);
               //function.getImportParameterList().setValue(filePath, "FILEPATH");
               //function.getImportParameterList().setValue(BDCLOG, "BDCLOG");
               mConnection.execute(function);
                               catch (Exception ex) {
                                   //System.out.println(ex.toString());
                                ex.printStackTrace();
                                 System.out.println("execute failed");
                                        mConnection.disconnect();
                                 System.exit(1);
          JCO.Table codes = null;
          codes =
             function.getTableParameterList().getTable("MESSAGE");
          try {
                    codes.firstRow();
                    for (int i = 0; i < codes.getNumRows(); i++, codes.nextRow()) {
                    System.out.println(codes.getString("CON")" "codes.getString("MESG"));
          catch(Exception ex1){
               ex1.printStackTrace();
               System.out.println("codes");
          if ( mConnection != null && mConnection.isAlive()) {
               mConnection.disconnect();
               System.out.println("chenggong");
          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 static void main(String[] args) {
               ConnectRFC app = new ConnectRFC();
               app.Connect1();
Regards,
taowenbo.

hi,
i had resolved my problem in other way.I don't upload my data using ws_upload now,but upload with table.
here is my code.Maybe helpful to somebody:
       JCO.Table C_XYORDERTable;
     JCO.Table C_XYORDPR_FINALTable;
     public void getXyordprFinalElement(Element e) {
          try {
               for (Iterator i = e.getChildren().iterator(); i.hasNext();) {
                    Element child = (Element) i.next();
                    if (child.getName().equals("ORDER_ID"))
                         C_XYORDPR_FINALTable.setValue(child.getText(), "ORDER_ID");
                    else if (child.getName().equals("ID"))
                         C_XYORDPR_FINALTable.setValue(child.getText(), "ID");
                    else if (child.getName().equals("PRODUCT_ID"))
                         C_XYORDPR_FINALTable.setValue(
                              child.getText(),
                              "PRODUCT_ID");
                    else if (child.getName().equals("MATNR"))
                         C_XYORDPR_FINALTable.setValue(child.getText(), "MATNR");
                    else if (child.getName().equals("QUANTITY"))
                         C_XYORDPR_FINALTable.setValue(child.getText(), "QUANTITY");
               C_XYORDPR_FINALTable.nextRow();
          } catch (Exception ex) {
               ex.printStackTrace();

Calling RFCs in Java WebDynpro

Hello Experts,
I'm new to WebDynpro. I'm a novice at best and have just learned the basics. I'll probably be asking a lot of questions about this soon. Here is one problem I recently encountered:
I managed to call RFCs from R/3 using a user input and then another one by using one field retrieved from the first called RFC. Now i have to call a BAPI recursively from the data I got from the 2nd RFC that I called.
Here is the code so far:
public void executeBapi_Network_Getdetail_Input( )
    //@@begin executeBapi_Network_Getdetail_Input()
    //$$begin Service Controller(246259973)
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       for (int i=0; i<wdContext.nodeZps_Fm_Get_Network_Num_Input().nodeNetworks().nodeEx_Networks().size(); i++) {
          wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Network(false);
          wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Network_Activity(true);
          wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Relation(true);
          wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Activity_Element(true);
          wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Activity_Milestone(true);
          wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Component(true);
          wdContext.currentBapi_Network_Getdetail_InputElement().setNumber(
            wdContext.nodeZps_Fm_Get_Network_Num_Input().nodeNetworks().nodeEx_Networks().getEx_NetworksElementAt(i).getAufnr());
          wdContext.currentBapi_Network_Getdetail_InputElement().modelObject().execute();
          wdContext.nodeNetworkDetails().invalidate();
          plannedCost.add(wdContext.nodeBapi_Network_Getdetail_Input().nodeNetworkDetails().nodeE_Network().getE_NetworkElementAt(i).getPlanned_Cost());
sorry if this is totally wrong. I'm totally a newbie here.
Hoping for your kind and helpful responses.
Cheers,
Alfonso

Hi Alfonso,
Can you please try this code:
       IWDMessageManager manager = wdComponentAPI.getMessageManager();
         try
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           // Initializing a IWDNode to make code more readable and clean
           IWDNode nodeEx_Networks = wdContext.nodeZps_Fm_Get_Network_Num_Input().nodeNetworks().nodeEx_Networks();
           // I have initialized the int variable because you should never calculate the size() in for loop.
           // It is major performance hit.
           int size = nodeEx_Networks.size();
           for (int i=0; i<size; i++) {
               wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Network(false);
               wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Network_Activity(true);
               wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Relation(true);
               wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Activity_Element(true);
               wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Activity_Milestone(true);
               wdContext.currentBapi_Network_Getdetail_InputElement().setI_Without_Component(true);
               wdContext.currentBapi_Network_Getdetail_InputElement().setNumber(nodeEx_Networks.getEx_NetworksElementAt(i).getAufnr());
               wdContext.currentBapi_Network_Getdetail_InputElement().modelObject().execute();
               // WHY IS THIS INVALIDATE DONE.. WHICH IS THIS NODE???
               wdContext.nodeNetworkDetails().invalidate();
            IWDNode nodeE_Network = wdContext.nodeBapi_Network_Getdetail_Input().nodeNetworkDetails().nodeE_Network();
              int sizeNetwork_Getdetail = nodeE_Network.size();
              for (int i = 0; i < sizeNetwork_Getdetail; i++) {
                   plannedCost.add(nodeE_Network.getE_NetworkElementAt(i).getPlanned_Cost());
              // Now you can check the plannedCost by printing it using the manager you have initialized above.
I hope this solves your issue. If you have any further issue please revert back.
Thanks and Regards
Pravesh

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i have two dll files named DLL_1.dll and DLL_2.dll .
Both of them contain a native method which has a signature
JNIEXPORT void JNICALL Java_Database_Notify
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This method is common to both the DLL
Now i load both of the DLL's using,
System.loadLibrary("DLL_1");
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How do i call the Notify Methos of second DLL(i.e DLL_2).
Is there any reference that i can get to all the DLL files when i load then , so that i can use that reference to invoke the Notify method of that particular DLL.

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Both of them contain a native method which has a
signature
JNIEXPORT void JNICALL Java_Database_Notify
(JNIEnv *, jclass);
This method is common to both the DLL
Now i load both of the DLL's using,
System.loadLibrary("DLL_1");
System.loadLibrary("DLL_2");
Both of the DLL are loaded form same Java
Application
But the problem is that , whenever i try to call the
Notify Method , it calls the Notify method of DLL_1
only.
How do i call the Notify Methos of second DLL(i.e
DLL_2).
Is there any reference that i can get to all the DLL
files when i load then , so that i can use that
reference to invoke the Notify method of that
particular DLL.You need to explain exactly what you are trying to achieve.
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And I didn't say JNI, I said java.
Your above statement suggests that you think that you can have exactly the same java signature do two different things.
Note again that I said java not JNI.
A JNI method is just a tag that represents a java signature. Your description suggests that you are attempting to do it twice.
There are three possibilities.
1. Your explanation is incomplete.
2. You are trying to do something that is impossible in java.
3. You are trying to solve a problem and your description of your solution is not sufficient to determine what that is (and of course the solution is wrong.)

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Call RFC from java (j2ee) / call to j2ee from R/3

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