Java Mapping : Multimapping possible or not?

Hi Experts ,
Can we use Java Mapping in Case of Multimapping where I am getting 2 messages as Input and I have to sent 1 message O/p.
Also the reverse case where I am getting I message as I/p and I have to sent 2 messages O/p
Your suggestions are required .
Regards

Hi Amit,
It is possible using Java Mapping.
Also, go through the below links to get a better idea.
http://help.sap.com/saphelp_nw04/helpdata/en/43/09b16006526e72e10000000a422035/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/42/f3ca2529491bc7e10000000a11466f/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/42/f3b31d48fb1bc8e10000000a11466f/frameset.htm
/people/thorsten.nordholmsbirk/blog/2006/08/10/using-jaxp-to-both-parse-and-emit-xml-in-xi-java-mapping-programs
/people/amol.joshi2/blog/2006/03/10/think-objects-when-creating-java-mappings
Structure Mapping: suppress multi occurence based on field content
Hope these help
Regards
Kiran..

Similar Messages

Get dynamic filename in a Java Mapping (NOT UDF)

Hi,
we are using a Java Mapping step in XI (not UDF). We need to have access to the filename. In the File Adapter we set the message attributes and can see the filename value in the SXMB_MONI.
We use the following code fragment to have access to the filename:
Container container = new Context(new FunctionWrapper(0));
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
String sourceFileName = conf.get(key);
This doesn't work. We think the declaration of the container class is wrong. Does anybody have some information about using the dynamic attributes in Java Mappings?
Thanks in advance
Michael

import com.sap.aii.mapping.api.*;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
public class JavaProgram
    implements StreamTransformation
    public JavaProgram()
    public void setParameter(Map map)
        param = map;
        if(param == null)
            param = new HashMap();
    public void execute(InputStream inputstream, OutputStream outputstream)
        try
            DynamicConfiguration dynamicconfiguration = (DynamicConfiguration)param.get("DynamicConfiguration");
            DynamicConfigurationKey dynamicconfigurationkey = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File", "FileName");
            String s = dynamicconfiguration.get(dynamicconfigurationkey);
         //Your logic
        catch(Throwable throwable)
            throwable.printStackTrace();
    private Map param;

Java Mapping problem...

Hi Gurus,
I am using the Java mapping in my XI system and it works fine in my Development.
I just moved all my objects in to QA and I am getting some problem in my Java mapping. It is not behaving like the dev the output format.
Is their anything have to do for Java mapping while importing in to the QA system.
I did the file transport and imported in to my QA.
Please give me your comments and solution to resolve this issue.
Thanks,
Jane.

Getting the below error in my response.
- <ResponseMessage>
- <Status>
<StatusCode>500</StatusCode>
<StatusText>Error while parsing the input</StatusText>
- <Errors>
- <Error type="Error">
<ErrorMessage>Fatal Error: Internal server error - 1187224995259871</ErrorMessage>
</Error>
</Errors>
</Status>
</ResponseMessage>
Thanks,
Jane.

PI 7.4 Single Stack - OS Command and Java Mapping Trace

Hi,
Since ABAP stack is not avilable how to use the OS command and also want to know how to check the trace for java mapping since sxmb_moni is not avilable.
Please send me some link for 7.4 or 7.31 single stack document.
Thanks
Jignesh shah

Jo Jignesh,
Please see the document below.
Mapping Trace in SAP PI 7.31 Single Stack
Regards,
Jannus Botha

DB Look Ups using JAVA Mapping

Hi Frnds,
I'm working one B2B Project, my question is,
I have to retrieve Order ,Order Response from one Data Base,
its already stored in DATA BASE as a CLOB Message.
I developed one JAVA Map to retrieve Order And Order Response.
its working fine,
But i made a connection through JAVA Map only,
But as Per SAP its not a good advice to perform Statefull operations through JAVA Mapping.
My Client not accpeting this approach.
what is the next way,
I performed some DB Look up using JDBC Adapter And Visula Admin.
But in this case its not a easy to retrieve the Order And Order Response.
Because in My logic there is 5 SQL Statements there.
Any one can provide Solution.
Thanks ,
Raj

Hi,
As you said, you have to run 5 sql statements and fetch Order and OrderResponse. Let's say all your inputs for these sql statements are A,B,C,D,E then these will be input parameters for Stored Procedure and out parameters will be Order and OrderResponse. Fetching logic should be in the stored proc.
By this approach you will get Order and OrderResponse in the Stored Proceedure response structure. That structure you can map to your Receiver structure. (if i am not wrong this is your aim)
You can see this sample blog on Stored Procedure scenario...
JDBC Stored Procedures
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/5474f19e-0701-0010-4eaa-97c4f78dbf9b
(3rd Scenario in the above pdf)
Also refer
http://help.sap.com/saphelp_nw04/helpdata/en/2e/96fd3f2d14e869e10000000a155106/frameset.htm
Regards

Dynamic configuration not working in Java mapping

Hi All,
I have a scenario where i am using java mapping. In this i am doing following
1)Read file name from input message header
2)set file name in output message Header
3) set Directory name in output message Header
i have used following code .. but iit is not working... when i test end to end... in reciver communication channel it is failing stating " message failed as "Directory is not set in Header. Also i checked in SXMB_MONI "dynamic configuration".It is not showing Directory.
this is code.
public void transform(TransformationInput transformationInput,TransformationOutput transformationOutput)
               throws StreamTransformationException {
               private Map para;
               String Directory ;
               String inputFileName;
               String var1 = "ABC";
               para = transformationInput.getInputHeader().getAll();
               DynamicConfiguration conf = (DynamicConfiguration) para
                         .get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
               DynamicConfigurationKey keyFileName1 = DynamicConfigurationKey
               .create("http://sap.com/xi/XI/System/File", "FileName");
                     inputFileName = conf.get(keyFileName1);
               DynamicConfigurationKey keyFilename = DynamicConfigurationKey
                         .create("http://sap.com/xi/XI/System/File", "FileName");
               DynamicConfigurationKey keyDirecory = DynamicConfigurationKey
                         .create("http://sap.com/xi/XI/System/File", "Directory");
               Directory = "tmp/"+var1;
               conf.put(keyFilename,inputFileName);
               conf.put(keyDirecory, Directory);
I am in PI 7.1 ,   and in eclipse its showing warning that Para is not used.
Can anyone show some lights.
Also is there any way to debug this?? like is there any function by which i can write the trace for each step to see those in MONI.

Method name:   public void createDirectory(Resultlist result, Container container)throws StreamTransformationException
//Use Simple UDF and do the following lines
String Directory ;
String inputFileName;
String var1 = "ABC";
DynamicConfiguration conf = container
    .getTransformationParameters()
    .get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey keyFileName1 = DynamicConfigurationKey
               .create("http://sap.com/xi/XI/System/File", "FileName");
inputFileName = conf.get(keyFileName1);
DynamicConfigurationKey keyFilename = DynamicConfigurationKey
               .create("http://sap.com/xi/XI/System/File", "FileName");
DynamicConfigurationKey keyDirecory = DynamicConfigurationKey
               .create("http://sap.com/xi/XI/System/File", "Directory");
Directory = "tmp/"+var1;
conf.put(keyFilename,inputFileName);
conf.put(keyDirecory, Directory);
and remove these 3 lines
//private Map para;
//para = transformationInput.getInputHeader().getAll();
//DynamicConfiguration conf = (DynamicConfiguration) para.get(StreamTransformationConstants.DYNAMIC_CONFIGURATION
>>I am in PI 7.1 , and in eclipse its showing warning that Para is not used.Can anyone show some lights.
You can simply remove declaring Map Para line... The eclipse gives warning because you dont assign values for it and you are trying to use...
For using the same input file name in output side, you dont need coding ... you need only for the directory...
Enable ASMA attributes in the channel.
Edited by: Baskar Gopal on Feb 24, 2011 10:58 AM

Java Mapping - Not able to compile .Java file

Hi Experts,
I am working with a sample scenario which involves Java Mapping. For this I created MappingClass.java file, After compiling the .Java file .Jar file would be used for Java Mapping by using Imported Archives.
After compiling the MappingClass.java file, I am getting the errors as below.
--> Java errors after compilation
C:\j2sdk1.4.2_13\bin>javac MappingClass.java
MappingClass.java:4: package com.sap.aii.mapping.api does not exist
import com.sap.aii.mapping.api.AbstractTrace;
                               ^
MappingClass.java:5: package com.sap.aii.mapping.api does not exist
import com.sap.aii.mapping.api.StreamTransformationConstants;
--> End of java errors
In the MappingClass.java file, I had given followed imports.
import java.util.*;
import com.sap.aii.mapping.api.AbstractTrace;
import com.sap.aii.mapping.api.StreamTransformationConstants;
Could some one please guide me to resolve this issue.
Thanks in advance.
..Sree

Hi
I had copied " aii_map_api.jar " file in my Java Class path folder.. i.e " C:\j2sdk1.4.2_08\bin "     AND    " C:\j2sdk1.4.2_08\lib " folders too.. and even in C:\ i.e Root Drive also.
After trying to Compile my java file (ex : MappingClass.java), still I am getting the errors.
Errors shown as below.
--> Errors
C:\mytest>javac MappingClass.java
MappingClass.java:2: package com.sap.aii.mapping.api does not exist
import com.sap.aii.mapping.api.AbstractTrace;
                               ^
MappingClass.java:3: package com.sap.aii.mapping.api does not exist
import com.sap.aii.mapping.api.StreamTransformationConstants;
                               ^
MappingClass.java:6: cannot resolve symbol
symbol : class AbstractTrace
location: class MappingClass
    private static AbstractTrace trace = null;
                   ^
MappingClass.java:12: cannot resolve symbol
symbol : class AbstractTrace
location: class MappingClass
        trace = (AbstractTrace)inputparam.get(
                 ^
MappingClass.java:13: cannot resolve symbol
symbol : variable StreamTransformationConstants
location: class MappingClass
                   StreamTransformationConstants.MAPPING_TRACE );
                   ^
5 errors
--> End of Errors
Could some one please guide me to resolve this issue.
Thanks in advance.
..Sree

Java Mapping (not UDF) and Adapter-Specific Message Attributes

Hello everybody,
is it possible to create an Adapter-Specific Message Attributes in a java Mapping?
I found in the SAP Help that the API com.sap.aii.mapping.api.DynamicConfiguration allows only to read, change or delete the attributes.
best regards.
Adnane Elgoute

Hi,
try the follwoing code
import com.sap.aii.mapping.api.*;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
public class JavaProgram
    implements StreamTransformation
    public JavaProgram()
    public void setParameter(Map map)
        param = map;
        if(param == null)
            param = new HashMap();
    public void execute(InputStream inputstream, OutputStream outputstream)
        try
            DynamicConfiguration dynamicconfiguration = (DynamicConfiguration)param.get("DynamicConfiguration");
            DynamicConfigurationKey dynamicconfigurationkey = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File", "FileName");
            String s = dynamicconfiguration.get(dynamicconfigurationkey);
         //Your logic
        catch(Throwable throwable)
            throwable.printStackTrace();
    private Map param;

Xerces for XSD 1.1 Validation not working in Java Mapping

Hi Experts,
We are trying to use XSD 1.1 (assertion feature) validation for the XML payload in a Java mapping program. But I am getting the following exception:
java.lang.IllegalArgumentException: http://www.w3.org/XML/XMLSchema/v1.1 at javax.xml.validation.SchemaFactory.newInstance(SchemaFactory.java:186)
This is happing for the statement:
SchemaFactory factory = SchemaFactory.newInstance("http://www.w3.org/XML/XMLSchema/v1.1");
The reason (apparently) is because it is not able to instantiate the class org.apache.xerces.jaxp.validation.XMLSchema11Factory , which is the Xerces implementation of the SchemaFactory class.
I have tried following things so far -
1. If I try to validate an xml against an xsd 1.1 schema in a standalone program, it works perfectly fine.
2. If I try to deploy this whole functionality on to the server through an EAR (like an adapter module), there again it works.
3. Also tried this before instantiating the SchemaFactory -
System.setProperty("javax.xml.validation.SchemaFactory:http://www.w3.org/XML/XMLSchema/v1.1","org.apache.xerces.jaxp.validation.XMLSchema11Factory");
4. I tried by creating the Imported Archive objects for all the Xerces jars that we require for validation, within the same SWCV, namespace. But still I get the same exception as above (IllegalArgumentException)
5. The link [http://help.sap.com/saphelp_nw70/helpdata/en/b6/8097f5a5edea4f8dfc87ac87082b22/content.htm ] mentions that we need to place all the necessary jars at location <SAP_J2EE_Engine_install_dir>/cluster/server/bin/ext /. But even after placing the jars there, I get the same exception.
I am not sure how we need to handle this. Has anybody faced a similar situation? Any suggestions?
Regards,
Sudheer

Hi Stefan,
Thanks for the reply.
We are on PI 7.1 SP 06. The standard XML tools from jdk supports only XSD 1.0, as far as I know. And XSD 1.0 does not have the Assert feature (also known as, co-occurrence constraint). More details are provided here - [http://www.ibm.com/developerworks/library/x-xml11pt2/]
To use XSD 1.1, we need a different implementation like Xerces-J. I am not sure how we can use it without external jars. I would like to mention again that I could achieve this by using an adapter module (EAR containing the jars), but I need to do this in Java Mapping (imported archive).
Do you know how we can achieve this in any other way? Any other suggestions welcome.
Thanks & Regards,
Sudheer

N:1 Mapping Possible using Java Mapping?

All,
Is it possible to do a N:1 mapping using Java Mapping?
If yes , how?
Reason for this question is that the execute() of the Java Mapping is going to take the source / request message as the InputStream . In the case of N:1 mapping , as we have multiple messages , how will they be send to the InputStream? Will both the messages be sent combined into the InputStream? Will the MESSAGES tag be embedded into the input stream?
Regards,
Bhavesh

Hi @ll;
i try the same.
to conduct a java mapping with 2 input structures that fills one target structure.
This mapping is part of a Integrationprocess.
I tested the mapping at the Integration Repository (Interface mapping) with the structure given by henrique and it works fine without any error.
At runtime this structure looks like this (different prefix)
<?xml version="1.0" encoding="UTF-8"?>
<sxi:Messages xmlns:sxi="http://sap.com/xi/XI/SplitAndMerge">
     <sxi:Message1>
          <YOURXML1>...</YOURXML1>
     </sxi:Message1>
     <sxi:Message2>
          <YOURXML2>...</YOURXML2>
     </sxi:Message2>
</sxi:Messages>
As I put it in the Integrationprocess unfortunately a strange error arises.
The trace Workflow-Protocoll shows following error.
<Trace level="2" type="T">Call method execute of the application Java mapping com.endress.infoserve.xi.mapping.MergeConfigStore_IdocOrder </Trace>
<Trace level="2" type="T">Java mapping com/endress/infoserve/xi/mapping/MergeConfigStore_IdocOrder completed. (executeStep() of com.endress.infoserve.xi.mapping.MergeConfigStore_IdocOrder </Trace>
<Trace level="1" type="T">Parsing error after multi mapping.Expected Message<i> instead of IDOC </Trace>
I can't make head nor tail of it.
what´s the mistake?
can anybody please help me?
Thanks in advance
Kind regards

XML not well formed - Java Mapping, Webservice to RFC Scenario

Hello All Experts,
I have facing a strange type of error. I have written a Java Mapping which implements a DOM parser to take a request from a Webservice and validate it on the basis of some prerequisites. i.e. If data in the incoming request is valid, it creates a message of the same structure type as the input. If the incoming data is incorrect or incomplete; It generates an Error response structure.
When I run and test the same mapping program using Editplus Java editor for the error scenario; it executes perfectly and creates the correct error XML structure. (I checked it by importing the structure in the XI Message mapping test tab). But when I create jar of my java mapping program and test it in my interface mapping, it gives me "XML not well formed error" (Problem while building the tree).
Any idea as to why is it behaving in such a way? There are 2 reasons which come to my mind as of now:
1. The initilization of my input and output streams in the public static void main:
            InputStream in = new FileInputStream(new File("Input.xml"));
           OutputStream out = new FileOutputStream(new File("Output.xml"));
           validateXML myMapping = new ValidateXML();
            myMapping.execute(in, out);
The Output.xml has the xml structure for the correct case, do I have to initialize my outputstream for the error file? say error.xml
2. My Webservice interface is a sychronous interface (Request / Response) and output of the Java mapping program are two asynchronous interface. (I'll use a synch-asynch bridge when this works) - Is that causing a problem?
Please help.
Best regards,
Varun

Hello Varun,
it gives me "XML not well formed error" (Problem while building the tree).
I have come across the same error message while testing in interface mapping. My problem was when an exception occured in java mapping, the execution terminates with the messages XML not well formed error". In order to solve this issue what i did was catch the exception type TransformerException and in that catch block throw StreamTransformationException exception in main methos of mapping program i.e execute().
eg:-
catch (TransformerException e) {
               throw new StreamTransformationException("Can not write XML.", e);
By doing this you will see the exception raised , because some times when you execute your mapping with mail() method, though it create the file, when you try to open it will give error if any exceptions occured in mapping. By using the above notation you can handle those in java mapping.
Hope you have gone through this blog.
[Handling and Tracing Exceptions in java mapping|http://www.sdn.sap.com/irj/scn/weblogs;jsessionid=(J2EE3417700)ID1055371050DB01666765031379427182End?blog=/pub/wlg/15061]
Regards,
Prasanna

Java Mapping (Not Working)

Hi....
I have done java mapping using file to file scenario....
I have created two data types, two message types, two message interfaces... in imported archives i have imported
dom4j-1.6.1.zip and itext.jar files..
i have written my java code like this:
package com.xmltopdf;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import com.lowagie.text.xml.XmlToPdf;
public class MyXmlToPdf {
public MyXmlToPdf(String inputFile, String outputFile){
try {
XmlToPdf xtp = new XmlToPdf();
System.out.println("Ravi");
xtp.parse(new FileInputStream(inputFile), new FileOutputStream(outputFile));
}catch(Exception e ) {
System.out.println(e);
in message mapping i have invoked "MyXmlToPdf(String,String) constructor like this:
MyXmlToPdf xmt= MyXmlTOPdf("C:
source
filetofile.xml","C:
source
file.pdf");
return "";
and i have configured my communication channel, reciever determination, sender aggrement, reciver aggrement, and interface determination.....
so please tell me whether my code is correct or not... if its correct why i am not getting the pdf file.. if its not correct please tell me whats wrong in my code...
Thanks & Regards
Ravi Shankar B

Hi ,
select XMLTOOLKIT option in Operation mapping and execute it.
I am not sure we can call java program in XSLT Program,but alternative is copy the code and use it in XSLT mapping it self,that means your XSLT program will become with JAVA extensions.
then in Operation mapping level select SAPXMLTOOL kit option and execute it. i hope it will work. if it is not working then you have deploy some JAXP files on server,because the way execution of XSLT Mpaping program got changed,like when eve you executing XSLT with extnasions( if you are not using XMLTOOL kit option) then you have to use latest version of JAXP.JDK files.
Regards,
Raj

Multimapping with java mapping

Hi,
i am trying to do multimapping with java mapping, but I am getting error "unexpected end-of-file" in SXMB_MONI.
for multimapping I have appended necessary code...
<?xml version="1.0" encoding="UTF-8"?>
<ns0:Messages xmlns:ns0="http://sap.com/xi/XI/SplitAndMerge">
<ns0:Message1>
please suggest me solution.

I am creating 1:N multimapping and for that i have written 2 java programs, one consist of "execute" method and another "main" method.
and java code is:
public class Mapping_test implements StreamTransformation {
     private Map map;
     public void setParameter(Map param) {
          map = param;
     public void execute(InputStream in, OutputStream out) {
               try {       out.write( "<?xml version=\"1.0\" encoding=\"UTF-8\"?>".getBytes());
               out.write("<ns0:Messages xmlns:ns0=\"http://sap.com/xi/XI/SplitAndMerge\">".getBytes());
                out.write("<ns0:Message1>".getBytes());
                out.write("<ns1:FIN_GBO_AR_POSTING xmlns:ns1=\"urn:sap-com:AR_POSTING\">".getBytes());
                      out.write("<MS_GBO_Header>".getBytes());
                      out.write(("<SourceSystem>" + "FIS0045_FIS" + "</SourceSystem>").getBytes());
                      out.write(("<TargetSystem>" + "FIS0101_SAP_ECC" + "</TargetSystem>").getBytes());
                      out.write(("<InterfaceID>" + "sap"   + "</InterfaceID>").getBytes());
                      out.write("</MS_GBO_Header>".getBytes());
               out.write("</ns1:FIN_GBO_AR_POSTING>".getBytes());
               out.write("<ns1:FIN_GBO_AR_POSTING xmlns:ns1=\"urn:sap-com:AR_POSTING\">".getBytes());
                      out.write("<MS_GBO_Header>".getBytes());
                      out.write(("<SourceSystem>" + "FIS0045_FIS" + "</SourceSystem>").getBytes());
                      out.write(("<TargetSystem>" + "FIS0101_SAP_ECC" + "</TargetSystem>").getBytes());
                      out.write(("<InterfaceID>" + "sap"   + "</InterfaceID>").getBytes());
                      out.write("</MS_GBO_Header>".getBytes());
               out.write("</ns1:FIN_GBO_AR_POSTING>".getBytes());
                       out.write("</ns0:Message1>".getBytes());
                       out.write("</ns0:Messages>".getBytes());
catch(Exception e)
now I am getting error "unexpected end-of-file" mentioned above.
please suggest ..

Is it possible to call XSLT from Java Mapping Class?

Hi,
does someone have experience with this? Or any ideas?
And, if yes, how can be this XSLT called? Is it necessary to specify special path? Or it is the XSLT file placed in the same directory?
Thanx in advance, Peter
Message was edited by: Peter Jarsunek

Hi SUdhir,
Thanx 4 your answer. I have seen this link before, but there is only Java->Java or XSLT->Java calling.. I need Java->XSLT.. When I create Java mapping, I want to use stored XSLT stylesheet to convert the message. Because, my problem is,that my primary message contains characters which I want to be changed. For this reason I need java class - to replace the characters. And then I want to do transformation with the XSLT stylesheet. Can you post some example?
Thanx, Peter

Java Mapping, XSLT Mapping, ABAP Mapping

Hi Experts,
Could any one explain what is the main features of the following Mapping. How to pick the mapping?
Java Mapping - When to use and what is the advantage.
ABAP Mapping - When to use and what is the advantage.
XSLT Mapping - When to use and what is the advantage.
Graphical Mapping - When to use and what is the advantage.
cheers,
Sunee

There are 4 types of mapping in XI
1. Graphical Mapping
2. XSLT Mapping
3. JAVA Mapping
4. ABAP Mapping
When to use Message mapping
1 When the logic for your mapping is simple and straight forward, you can use
Advantages of message mapping
1)Easy to use.
2) has GUI drag and drop.
3) used for simple mapping cases
4) it does not involve any complex logic
Disadvantages of message mapping
1)has limitation in terms of complex hierarchy
When to use Java mapping
1) Java mapping are used when graphical mapping cannot help you.
Advantages of Java Mapping
1)you can use Java APIs and Classes in it.
2) file look up or a DB lookup is possible
3) DOM is easier to use with lots of classes to help you create nodes and elements.
Disadvantages of Java mapping
1)SAX parser is not easy to develop
2)DOM parser is intensive
3) Java knowledge is required
4) bit complexer
XSLT Mapping - When to use
1)When the required output is other than XML like Text, Html or XHTML (html displayed as XML )
2)When default namespace coming from graphical mapping is not required or is to be changed as per requirements.
3)When data is to be filtered based on certain fields (considering File as source)
4)When data is to be sorted based on certain field (considering File as source)
5)When data is to be grouped based on certain field (considering File as source)
Advantages of using XSLT mapping
1)XSLT program itself defines its own target structure.
2)XSLT programs can be imported into SAP XI. Message mapping step can be avoided. One can directly go for interface mapping once message interfaces are created and mapping is imported.
3)XSLT provides use of number of standard XPath functions that can replaces graphical mapping involving user defined java functions easily.
4)File content conversion at receiver side can be avoided in case of text or html output.
5)Multiple occurrences of node within tree (source XML) can be handled easily.
6)XSLT can be used in combination with graphical mapping.
7)Multi-mapping is also possible using xslt.
8)XSLT can be used with ABAP and JAVA Extensions
Disadvantages of using XSLT mapping
1)Resultant XML payload can not be viewed in SXMB_MONI if not in XML format (for service packs < SP14).
2)Interface mapping testing does not show proper error description. So errors in XSLT programs are difficult to trace in XI but can be easily identified outside XI using browser.
3)XSLT mapping requires more memory than mapping classes generated in Java.
4)XSLT program become lengthier as source structure fields grows in numbers.
5)XSLT program sometimes become complex to meet desired functionality.
6)Some XSL functions are dependent on version of browser.
Advantages of Abap Mapping
1) A person comfortable with OOABAP can go for ABAP mapping instead.
Disadvantages of Abap Mapping
1) Abap knowledge is required
2) bit compexer
For further info on each of the mapping, refer to these links,
Graphical Mapping,
http://help.sap.com/saphelp_nw04/helpdata/en/6d/aadd3e6ecb1f39e10000000a114084/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/43/c4cdfc334824478090739c04c4a249/content.htm
XSLT Mapping
http://help.sap.com/saphelp_nw04/helpdata/en/73/f61eea1741453eb8f794e150067930/content.htm
http://www.w3.org/TR/xslt20/
Java Mapping
http://help.sap.com/saphelp_nw04/helpdata/en/e2/e13fcd80fe47768df001a558ed10b6/content.htm
DOM parser API
http://java.sun.com/j2se/1.4.2/docs/api/org/w3c/dom/package-frame.html
Check this blog on Mapping:
/people/ravikumar.allampallam/blog/2005/02/10/different-types-of-mapping-in-xi
Also, check this thread for more info,
Different types of Mapping in XI

Java Mapping : Multimapping possible or not?

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