Java RFC Class Library

Hi,
I'm an SAP programmer (not a Basis person). I want to write a Java application (using Eclipse) that has to communicate with SAP backend system. Where can I find Java RFC Class Library to install on my laptop? I have SAP Frontend installed on my laptop. Will I find it under SAP Frontend folder? OR can it be downloaded from a website?
Thanks

Try this link.... This is for the JCo adapter - SAP Java Connector is only available from SAP for connecting Java Applications to SAP systems.
https://service.sap.com/~form/sapnet?_SHORTKEY=01100035870000463649
Or see OSS Note: http://service.sap.com/~form/handler?_APP=01100107900000000342&_EVENT=DISPL_TXT&_NNUM=413708/
/people/sap.user72/blog/2005/12/27/first-eclipse-plug-in-for-xi
http://sourceforge.net/projects/xi-plugins-sdn
http://weblog.cemper.com/a/200309/25-sap2java-generator-eclipse-plugin.php
http://eclipsesap2java.sourceforge.net/
Message was edited by: Barry Neaves - added links to Eclipse plug-in and information.

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XSLT Mapping : RFC Lookup using java helper class

Hi All,
I am doing RFC Lookup in xslt mapping using java helper class. I have found blog for the same (http://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/05a3d62e-0a01-0010-14bc-adc8efd4ee14) However this blog is very advanced.
Can anybody help me with step by step approach for the same?
My basic questions are not answered in the blog as:
1) where to add the jar file of the java class used in xslt mapping.
I have added zip file of XSLT mapping in imported archived and using that in mapping.
Thanks in advace.
Regards,
Rohan

Hi,
Can u please have look at this in detail , u can easily point out yourself the problem...
http://help.sap.com/saphelp_nw04/helpdata/en/55/7ef3003fc411d6b1f700508b5d5211/content.htm
Please observe the line,
xmlns:javamap="java:com.company.group.MappingClass
in XSLT mapping..
The packagename of class and class name and XSLT namespace should be matching...
Babu
Edited by: hlbabu123 on Sep 29, 2010 6:04 PM

Code Sample: Easy RFC Lookup From XSLT Mappings Using a Java Helper Class

Hi everyone,
This is just a shameless plug for my article: <a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/05a3d62e-0a01-0010-14bc-adc8efd4ee14">Easy RFC Lookup From XSLT Mappings Using a Java Helper Class</a>. I hope you're interested in reading it, and I welcome your comments in this thread.
Kind regards,
Thorsten

Hi Stefan. Thanks for your post. I have already done that. It still does not work. As a base for my java helper class I have usesd Thorstens code.
The problem is quite confusing. I will try to ouline both issues here.
First of all, when try to test from within the Operation Mapping, I always get a java error saying it cannot find the communication channel (it is there and working because I have tested it with the RFCLookup in graphical mapping). I have found a way to work around this, and that is to uncheck the "Use SAP XMLToolkit" checkbox --> switch to test tab, enter my ReceiverService in the parameter tab (header parameter) --> switch back to Definition tab, check the "Use SAP XMLToolkit" checkbox --> switch to Test tab and run the test. Then the XSLT and call to java helper class will work. Of course this is not really something you want to do all the time. Maybe there is a bug.
Secondly, it never works when I try to do it "live". I am using a file adapter to pick up one file, convert it and a file adapter to drop the converted file. I get the following error code in SXMB_MONI.
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>

<SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="">
<SAP:Category>Application</SAP:Category>
<SAP:Code area="MAPPING">TRANSFORMER_CONF_EX</SAP:Code>
<SAP:P1>ATJ_Accounting2XML_Accounting.xsl</SAP:P1>
<SAP:P2>http://rd.accounting.logica.com</SAP:P2>
<SAP:P3>fd552c30-bad9-11dd-9761-c21dac1b818c</SAP:P3>
<SAP:P4>-1</SAP:P4>
<SAP:AdditionalText />
<SAP:Stack>TransformerConfigurationException triggered while loading XSLT mapping ATJ_Accounting2XML_Accounting.xsl; http://rd.accounting.logica.comfd552c30-bad9-11dd-9761-c21dac1b818c-1</SAP:Stack>
<SAP:Retry>M</SAP:Retry>
</SAP:Error>
Using an XSLT without a call to a java helper class, works just fine.
I am totally at a loss here. Any more input would be much appreciated.
/Patrik

Java Error in RFC Lookup in XSLT Mapping usinf Java helper class

Hi All,
I am doing RFC Lookup in XSLT Mapping using Java Helper class.
The Lookup works fine when called one RFC at a time However my requirement is I want to do 2 Lookups.
Both Lookups works when done individually however when I call both lookups in one mapping I get following error "javax.xml.transform.TransformerException: DOMSource whose Node is null."
Following is the code I have written in XSLT for the lookup:
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          <xsl:param name="STDPN"/>
               <rfc:RFC_READ_TABLE>
                    <QUERY_TABLE>KNA1</QUERY_TABLE>
                    <OPTIONS><item><TEXT>
                              <xsl:value-of select="$STDPN"/>
                         </TEXT></item>
                    </OPTIONS>
                    <FIELDS>
                         <item>
                              <FIELDNAME>KUNNR</FIELDNAME>
                         </item>
                    </FIELDS>
               </rfc:RFC_READ_TABLE>
          </xsl:variable>
          <xsl:variable name="response" xmlns:lookup="java:urn.mt.pi" select="lookup:execute($request, 'BS_D, 'cc_RfcLookup', $inputparam)"/>
          <xsl:element name="STDPN">
               <xsl:value-of select="$response//DATA/item/WA"/>
          </xsl:element>
     </xsl:template>
     <xsl:template name="Lookup_2">
          <xsl:param name="BELNR"/>
               <xsl:variable name="Query">AGMNT = '<xsl:value-of select="$BELNR"/>'</xsl:variable>
               <xsl:variable name="request1">
                    <rfc:RFC_READ_TABLE>
                         <QUERY_TABLE>ZTABLE</QUERY_TABLE>
                         <OPTIONS><item><TEXT>
                              <xsl:value-of select="$Query"/>
                              </TEXT></item>
                         </OPTIONS>
                         <FIELDS>
                              <item>
                                   <FIELDNAME>KUNAG</FIELDNAME>
                              </item>
                         </FIELDS>
                    </rfc:RFC_READ_TABLE>
               </xsl:variable>
               <xsl:variable name="response1" xmlns:lookup="java:urn.mt.pi" select="lookup:execute($request1, 'BS_D','cc_RfcLookup', $inputparam)"/>
               <xsl:element name="BELNR">
                    <xsl:value-of select="$response1//DATA/item/WA"/>
               </xsl:element>
     </xsl:template>
My Question: Am I doing anything wrong? Or Is it possible to call multiple lookups in one XSLT?
Thanks and Regards,
Atul

Hi Atul,
I had the same problem like you had.
The main Problem is that with the example code the request variable is created as NodeList object. In XSLT a variable is somekind of a constant and can't be changed. As the request object is empty after the first request the programm fails at the following line:
Source source = new DOMSource(request.item(0));
So I've created a workaround for this problem.
In the call of the template I've put the request as a parameter object at the template call:
<xsl:with-param name="req">
<rfc:PLM_EXPLORE_BILL_OF_MATERIAL xmlns:rfc="urn:sap-com:document:sap:rfc:functions">
<APPLICATION>Z001</APPLICATION>
<FLAG_NEW_EXPLOSION>X</FLAG_NEW_EXPLOSION>
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<BOMITEM_DATA/>
</rfc:PLM_EXPLORE_BILL_OF_MATERIAL>
</xsl:with-param>
With this change the request will be provided as a String object and not as a NodeList object.
Afterwards the RfcLookup.java has to be changed to the following:
package com.franke.mappings;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.sap.aii.mapping.lookup.Channel;
import com.sap.aii.mapping.api.StreamTransformationConstants;
import com.sap.aii.mapping.api.AbstractTrace;
import com.sap.aii.mapping.lookup.RfcAccessor;
import com.sap.aii.mapping.lookup.LookupService;
import com.sap.aii.mapping.lookup.XmlPayload;
* @author Thorsten Nordholm Søbirk, AppliCon A/S
* Helper class for using the XI Lookup API with XSLT mappings for calling RFCs.
* The class is generic in that it can be used to call any remote-enabled
* function module in R/3. Generation of the XML request document and parsing of
* the XML response is left to the stylesheet, where this can be done in a very
* natural manner.
* TD:
* Changed the class that request is sent as String, because of IndexOutOfBound-exception
* When sending multiple requests in one XSLT mapping.
public class RfcLookup {
     * Execute RFC lookup.
     * @param request RFC request - TD: changed to String
     * @param service name of service
     * @param channelName name of communication channel
     * @param inputParam mapping parameters
     * @return Node containing RFC response
     public static Node execute( String request,
             String service,
             String channelName,
             Map inputParam)
          AbstractTrace trace = (AbstractTrace) inputParam.get(StreamTransformationConstants.MAPPING_TRACE);
          Node responseNode = null;
          try {
              // Get channel and accessor
              Channel channel = LookupService.getChannel(service, channelName);
              RfcAccessor accessor = LookupService.getRfcAccessor(channel);
               // Serialise request NodeList - TD: Not needed anymore as request is String
               /*TransformerFactory factory = TransformerFactory.newInstance();
               Transformer transformer = factory.newTransformer();
               Source source = new DOMSource(request.item(0));
               ByteArrayOutputStream baos = new ByteArrayOutputStream();
               StreamResult streamResult = new StreamResult(baos);
               transformer.transform(source, streamResult);*/
                // TD: Add xml header and remove linefeeds for the request string
                request = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"+request.replaceAll("[\r\n]+", "");
                // TD: Get byte Array from request String to send afterwards
                byte[] requestBytes = request.getBytes();
               // TD: Not used anymore as request is String
                //byte[] requestBytes = baos.toByteArray();
                trace.addDebugMessage("RFC Request: " + new String(requestBytes));
                // Create input stream representing the function module request message
                InputStream inputStream = new ByteArrayInputStream(requestBytes);
                // Create XmlPayload
                XmlPayload requestPayload =LookupService.getXmlPayload(inputStream);
                // Execute lookup
                XmlPayload responsePayload = accessor.call(requestPayload);
                InputStream responseStream = responsePayload.getContent();
                TeeInputStream tee = new TeeInputStream(responseStream);
                // Create DOM tree for response
                DocumentBuilder docBuilder =DocumentBuilderFactory.newInstance().newDocumentBuilder();
                Document document = docBuilder.parse(tee);
                trace.addDebugMessage("RFC Response: " + tee.getStringContent());
                responseNode = document.getFirstChild();
          } catch (Throwable t) {
               StringWriter sw = new StringWriter();
               t.printStackTrace(new PrintWriter(sw));
               trace.addWarning(sw.toString());
          return responseNode;
     * Helper class which collects stream input while reading.
     static class TeeInputStream extends InputStream {
           private ByteArrayOutputStream baos;
           private InputStream wrappedInputStream;
           TeeInputStream(InputStream inputStream) {
                baos = new ByteArrayOutputStream();
                wrappedInputStream = inputStream;
           * @return stream content as String
           String getStringContent() {
                return baos.toString();
          /* (non-Javadoc)
          * @see java.io.InputStream#read()
          public int read() throws IOException {
               int r = wrappedInputStream.read();
               baos.write(r);
               return r;
Then you need to compile and upload this class and it should work.
I hope that this helps you.
Best regards
Till

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0x00400000 - 0x00419000      E:\SC\SC12.1\SCApplications\SNMP\Bin\JNITester.exe
0x77F50000 - 0x77FF7000      C:\WINDOWS\System32\ntdll.dll
0x77E60000 - 0x77F46000      C:\WINDOWS\system32\kernel32.dll
0x10000000 - 0x10023000      E:\SC\SC12.1\SCApplications\SNMP\Bin\JniUtils.dll
0x00320000 - 0x00332000      E:\SnmpIpmNativeTestDriver\MTFStubHelper.dll
0x00340000 - 0x0035B000      E:\SnmpIpmNativeTestDriver\MTFXMLFileAPI.dll
0x12000000 - 0x122B1000      e:\sc\sc12.1\bin\xerces-c_2_2_0D.dll
0x77DD0000 - 0x77E5D000      C:\WINDOWS\system32\ADVAPI32.dll
0x78000000 - 0x78086000      C:\WINDOWS\system32\RPCRT4.dll
0x10200000 - 0x1026C000      e:\sc\sc12.1\bin\MSVCRTD.dll
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0x5F800000 - 0x5F8E9000      e:\sc\sc12.1\bin\MFC42uD.DLL
0x77C70000 - 0x77CB0000      C:\WINDOWS\system32\GDI32.dll
0x77D40000 - 0x77DCC000      C:\WINDOWS\system32\USER32.dll
0x5F700000 - 0x5F746000      e:\sc\sc12.1\bin\MFCD42uD.DLL
0x5F500000 - 0x5F5C6000      e:\sc\sc12.1\bin\MFCO42uD.DLL
0x10480000 - 0x104FE000      e:\sc\sc12.1\bin\MSVCP60D.dll
0x15020000 - 0x15042000      e:\sc\sc12.1\bin\SCTraceLib.dll
0x6D510000 - 0x6D58D000      C:\WINDOWS\System32\dbghelp.dll
0x77C10000 - 0x77C63000      C:\WINDOWS\system32\msvcrt.dll
0x77C00000 - 0x77C07000      C:\WINDOWS\system32\VERSION.dll
0x00360000 - 0x0037D000      e:\sc\sc12.1\bin\SCFileManager.dll
0x76BF0000 - 0x76BFB000      C:\WINDOWS\System32\PSAPI.DLL
0x00420000 - 0x00580000      e:\sc\sc12.1\bin\BctCoreCL.dll
0x5D920000 - 0x5D929000      C:\WINDOWS\System32\RPCNS4.dll
0x71B20000 - 0x71B31000      C:\WINDOWS\system32\MPR.dll
0x71C20000 - 0x71C6E000      C:\WINDOWS\System32\NETAPI32.dll
0x71AB0000 - 0x71AC5000      C:\WINDOWS\System32\WS2_32.dll
0x71AA0000 - 0x71AA8000      C:\WINDOWS\System32\WS2HELP.dll
0x15000000 - 0x15012000      e:\sc\sc12.1\bin\CTEventLog.dll
0x773D0000 - 0x77BC2000      C:\WINDOWS\system32\SHELL32.dll
0x70A70000 - 0x70AD4000      C:\WINDOWS\system32\SHLWAPI.dll
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0x08000000 - 0x08138000      D:\Java\j2re1.4.2_03\bin\client\jvm.dll
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Heap at VM Abort:
Heap
def new generation total 576K, used 132K [0x15050000, 0x150f0000, 0x15530000)
eden space 512K, 25% used [0x15050000, 0x15071250, 0x150d0000)
from space 64K, 0% used [0x150d0000, 0x150d0000, 0x150e0000)
to space 64K, 0% used [0x150e0000, 0x150e0000, 0x150f0000)
tenured generation total 1408K, used 0K [0x15530000, 0x15690000, 0x19050000)
the space 1408K, 0% used [0x15530000, 0x15530000, 0x15530200, 0x15690000)
compacting perm gen total 4096K, used 964K [0x19050000, 0x19450000, 0x1d050000)
the space 4096K, 23% used [0x19050000, 0x191410e0, 0x19141200, 0x19450000)
Local Time = Wed Aug 25 21:06:44 2004
Elapsed Time = 0
# HotSpot Virtual Machine Error : EXCEPTION_ACCESS_VIOLATION
# Error ID : 4F530E43505002EF
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
# Java VM: Java HotSpot(TM) Client VM (1.4.2_03-b02 mixed mode)

You are right, I tried getting the java.lang.Class reference for the com.test.Tester by calling getClass() on com.test.Tester
And using this jclass reference for java.lang.Class, I tried getting the method ID of getFields and eventually the Field[]
Thanks for the help
I have some more questions.
Assumption - Using JNI, I got the fields array of com.test.Tester and I am iterating through the fields
1.Assuming that the Tester class had an Integer field say m_nIntVal, then once I get the jobject equivalent of this Field in C++.
Now I need to get the type of the field (I call the method java.lang.reflect.getType() from JNI)
This gives me a jclass reference to it's type i.e java.lang.Integer
2.I need to get the name of this type i.e I want to get the name of the type in a string as "java.lang.Integer"
For this, on the jclass reference of java.lang.Integer got in Step 1, I call getClass() from JNI (to get the java.lang.Class) and then getName()
Now, for calling getClass(), I need a temporary object reference corresponding to the jclass of java.lang.Integer, The problem is that Integer does not have a default constructor, so my call to create the jobject fails.
But, since I do not know that I am constructing an Integer (remember that is what I am trying to find out - getType), I cant pass any values to constructor
Now, how do I go about creating a jobject of Integer, without knowing that I am constructing that, as this does not have a default constructor without parameters
Also, I tried using AllocObject to get the jobject and then tried to get the method ID of getClass(). Even this failed
3. If the com.test.Tester class had a primitive "int" field, say m_nPrimitiveInt
for which java provides a Class representation, I am able to get the jclass reference to the type of m_nPrimitiveInt
Now, how do I get the name of the type as "int" in a string?
Forllowing a similar procedure like in Step 2 fails when I try to pass the jclass reference to the type of m_nPrimitiveInt to the GetMethodID
with the error FATAL ERROR in native method: JNI received a class argument that is not a class
Can you tell me what is the way out?
Thanks in advance,
Also, can I mail you with some doubts that I have? If its ok, please contact me at [email protected]

Use java mapping class on PI 7.0

Hi experts,
I have a problem with a java mapping class on PI 7.0, maybe somebody could help me.
I have a java mapping that call a webservice using AXIS library. If I run on my PC the java mapping is working. I load on Imported Archive the Java mapping class and AXIS librarys. My Java mapping class is compilated by jdk 1.4.2.09, like others java mappings that i have on PI 7.0 system, but when I execute the interface, its returns an error:
Incompatible class versions (linkage error)
This error is caused by AXIS Libraries, I use AXIS 1.4 version, and I think that this version is using jdk 1.5 because I read it on some foros. Could somebody confirm it? If it is true, could somebody tell me if there are some AXIS version that use jdk 1.4 or maybe How could I solved it? Thanks.
Regards,
Gemma

Incompatible class versions (linkage error)
this is usually when the jdk version of XI server and the library version you used to develop the mapping are incompatible. Make sure you use the same version as of the server

Java RFC Class Library

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