No object DCH for MIME type multipart/related

Question

Hi, everyone!!!
When I execute my code, I got this exception:
javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/related
boundary="----=_Part_0_20851530.1186777547859"
the funny things is : I got it work before. However, when I come back a few days to run, it doesn't.
I use tomcat 5.0,
mail.jar: version: 1.6
activation.jar:version: I don't know but I download the new ones in sun website.
Note: Also, when I run the code below in standalone application (java application), it works but doesn't work on tomcat application
Any help would be appreciate.
I tried some helps tips from other website such as http://www.jguru.com/faq/view.jsp?EID=237257
and still doesn't work :((((
***********Here is my code**********
********props is properties file...............
Authenticator auth = new SMTPAuthenticator();
          // Get session
          Session session = Session.getDefaultInstance(props, auth);
          session.setDebug(true);
          // Create the message
          Message message = new MimeMessage(session);
          // Fill its headers
          message.setSubject(subject);
          message.setFrom(new InternetAddress(from));
for(int x=0;x<recipients.size();x++)
     message.addRecipient(Message.RecipientType.TO, new InternetAddress(recipients.get(x).toString()));
                    // Create your new message part
                    BodyPart messBodyPart=new MimeBodyPart();
                    // Set the HTML content, be sure it references the attachment
                    String htmlText="<h1>Hi</h1>"+"<img src=\"cid:picture\">";
                    // Set the content of the body part
                    messBodyPart.setContent(htmlText, "text/html");
                    // Create a related multi-part to combine the parts
                    MimeMultipart multipart=new MimeMultipart("related");
                    // Add body part to multipart
                    multipart.addBodyPart(messBodyPart);
                    // Create part for the image
                    messBodyPart=new MimeBodyPart();
                    // Fetch the image and associate to part
                    System.out.println("before dataSource");
                    DataSource fds=new FileDataSource(this.getString("image_location"));
                    System.out.println("After dataSource");
                    messBodyPart.setDataHandler(new DataHandler(fds));
                    System.out.println("*************** dataSource");
                    // Add a header to connect to the HTML
                    messBodyPart.setHeader("Content-ID", "<picture>");
                    // Add part to multi-part
                    multipart.addBodyPart(messBodyPart);
                    // Associate multi-part with message
                    message.setContent(multipart);
                    // Send message
                    System.out.println("Before Send");
                    Transport.send(message);
                    System.out.println("Finish");
}

Answer 1

Thank you for your response!!!
I already found the solution. For those who still having problem send e-mail, make sure to put mail.jar and activation.jar in the same location.
Also, make sure to check catalina.xml to make sure those jars are same location!!!->That what I found out.
->I put jars in same location of my eclipse project but it turns out, the tomcat app server didn't put them in same location.
Anyway, Thank you java_2006 for your response!!!!!
:)