Trivial problem with SOAP attachments

Question

Hi,
I'm writing a very simple standalone JAXM client which will send a SOAP message with attachments to a listening servlet. I can get the code to work for a SOAP message without attachments with no problems, but when I try to create an AttachmentPart object, there is a problem when running the code (there is an exception when I try to create an AttachmentPart object) even though the code compiles ok.
It must be something really obvious, and I've tried copying examples from the JWSDP tutorial but to no avail! Any ideas welcome!
import javax.xml.soap.*;
import java.util.*;
import java.net.URL;
public class JAXMClient{
public static void main(String[] args){
     String me = "Simon";
     try{
     SOAPConnectionFactory scFactory = SOAPConnectionFactory.newInstance();
     SOAPConnection con = scFactory.createConnection();
     MessageFactory factory = MessageFactory.newInstance();
     SOAPMessage message = factory.createMessage();
     // create attachment
     AttachmentPart attachment = message.createAttachmentPart();
     attachment.setContent(me, "text/plain");
     attachment.setContentId("my_name");
     message.addAttachmentPart(attachment);
     URL endpoint = new URL("http://localhost:8080/EGSO/TestServlet");
     System.out.println("Calling service....");
     SOAPMessage response = con.call(message,endpoint);
     System.out.println("Reply received!");
     response.writeTo(System.out);
     con.close();
     catch(Exception e){
     System.out.println("Error somewehere");

Answer 1

I use the below code to add attachments (from JWSDP tutorial)
StringBuffer urlSB = new StringBuffer();
urlSB.append(req.getScheme()).append("://").append(req.getServerName());
urlSB.append( ":" ).append( req.getServerPort() ).append( req.getContextPath() );
String reqBase = urlSB.toString();
AttachmentPart apText = msg.createAttachmentPart(new DataHandler(new URL(reqBase + "/test.html")));
               apText.setContentType("text/html");
msg.addAttachmentPart(apText);
(where msg is the SOAPMessage, and the "test.html" file resides in your servlet container's ROOT dir (eg $TOMCAT_HOME/webapps/ROOT)
Ben