OSB: Calling MTOM business service from non-MTOM proxy

Question

Hi,
it is very easy to call non-MTOM business service from MTOM enabled proxy service, but I don't know how to do it in an opposite way. I have web service proxy (http) with binary data in Base64 in a soap body element and I'd like to call a business service (web service over http again) using MTOM format to send binary data in binary format (and not in Base64 as it is in proxy). Is it possible to somehow decode binary data from Base64 in a proxy service and send them from this proxy to a business service using MTOM?

Answer 1

I understand the flow you propose, but I don't know how to pass decoded data from Java callout back to message flow. As far as I know I can only return primitives, String and XmlObject, because anything else can't be processed in message flow.Yes you are correct.But you can also return DataSource in java callout. Please http://download.oracle.com/docs/cd/E13159_01/osb/docs10gr3/userguide/pojo.html
Now the working solution/POC --Tested on my local linux box
package manoj.javacallout.binary;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import javax.activation.DataSource;
import javax.mail.util.ByteArrayDataSource;
import com.sun.org.apache.xml.internal.security.utils.Base64;
* TODO: I have use sun internal API for decoding for simplicity. You should modify this code with any base64 decoding library
* Ideally should be using using http://commons.apache.org/downloads/download_codec.cgi
* @author mneelapu
public class Util {
     public static DataSource decodeBase64(DataSource ds) throws Exception {
     InputStream in=ds.getInputStream();
     BufferedReader bin = new BufferedReader(new InputStreamReader(in));
     byte[] decodedB64=Base64.decode(bin);
     ByteArrayDataSource decodedDS= new ByteArrayDataSource(decodedB64,"binary/octet-stream");
     return(decodedDS);
Java Callout to decodeBase64
Parameters
javax.activation.DataSource=[ $body/* ]
Result
javax.activation.DataSource=response
Now replace the $body with the decoded base64 response from java callout
Replace [ node contents ] of [  undefined XPath  ]
in [ body ] with [ $response ]
Use $BEA_HOME/modules/javax.mail_1.4.jar for compiling.
Let me know if this solves your problem.
Thanks
Manoj
Edited by: mneelapu on Apr 20, 2009 3:23 PM