Error of using Java Mail in Web Start

Question

Hi,
I got a problem when using Java Mail to send email. My apps is a stand alone and no problem when it was deployed normally. When I used the Web Start to deploy it, the following error was caught when I tried to send email:
javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/mixed; boundary="----=_Part_0_2824645.1032281188963"
     at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:851)
     at javax.activation.DataHandler.writeTo(DataHandler.java:305)
     at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1089)
     at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1527)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:321)
     at javax.mail.Transport.send0(Transport.java:164)
     at javax.mail.Transport.send(Transport.java:81)
     at com.mailcom.client.util.EMail.sendMail(EMail.java:180)
Here is the source code:
public class EMail {
public static void sendMail(String host,
String sender,
String recipient,
String subject,
String content,
Vector fileNames) throws MessagingException {
Properties props = new Properties();
props.put("mail.smtp.host",host);
Session session = Session.getDefaultInstance(props,null);
session.setDebug(true);
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(sender));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipient,false));
msg.setSubject(subject);
Multipart mp = new MimeMultipart();
     // create and fill the first message part
     MimeBodyPart mbp1 = new MimeBodyPart();
     mbp1.setText(content);
     mp.addBodyPart(mbp1);
// attach the file to the message
if(fileNames != null && fileNames.size() != 0) {
FileDataSource fds = null;
for(int i = 0; i < fileNames.size(); i++ ) {
String currentFileName = (String)fileNames.elementAt(i);
     fds = new FileDataSource(currentFileName);
     // create the second message part
     MimeBodyPart mbp2 = new MimeBodyPart();
     mbp2.setDataHandler(new DataHandler(fds));
     mbp2.setFileName(fds.getName());
     // create the Multipart and its parts to it
     mp.addBodyPart(mbp2);
     // add the Multipart to the message
     msg.setContent(mp);
msg.setHeader("X-Mailer",MAILER);
     // set the Date: header
     msg.setSentDate(new Date());
     // send the message
line 180     Transport.send(msg);

Answer 1

Yes. All the third party jar files and our application jar are put on the server side. Here is the JNLP file:
<?xml version="1.0" encoding="utf-8"?>
<!-- JNLP File for software-->
<jnlp spec="1.0+" codebase="http://www.software.com/apps" href="client.JNLP">
<information>
<title>client application</title>
<vendor> * </vendor>
<homepage href="docs/help.html"/>
<description>Client</description>
<description kind="short">A tool</description>
<icon href="images/logo.jpg"/>
<offline-allowed/>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.3"/>
<jar href="lib/client.jar"/>
<jar href="lib/mail.jar"/>
<jar href="lib/smtp.jar"/>
<jar href="lib/activation.jar"/>
</resources>
<application-desc main-class="com.software.client.MainFrame">
     <argument>2226</argument>
     <argument>www.software.com</argument>
     <argument>5351</argument>
</application>
</jnlp>