Packaging in JAR makes JavaMail not work

Question

I have simple code (virtually identical to the demo code that comes with JavaMail 1.3) to send an email with an attachment that works fine until i package it in a JAR file and try and use javaw to run it. I have included the mail.jar and activation.jar files in the app JAR file with no success. Once again the code works fine outside of a JAR file.
-thanks
benji
Properties props = System.getProperties();
props.put("mail.smtp.host", server);
props.put("mail.from",from);
Session session = Session.getInstance(props, new myAuthenticator());
session.setDebug(debug);
try
MimeMessage msg = (MimeMessage)new MimeMessage(session);
msg.setFrom(new InternetAddress(from));
InternetAddress[] address = {new InternetAddress(to)};
msg.setRecipients(Message.RecipientType.TO, address);
msg.setSubject(subject);
MimeBodyPart mbp1 = (MimeBodyPart)new MimeBodyPart();
mbp1.setText(message);
MimeBodyPart mbp2 = new MimeBodyPart();
FileDataSource fds = new FileDataSource(sendFile);
mbp2.setDataHandler(new DataHandler(fds));
mbp2.setFileName(fds.getName());
Multipart mp = new MimeMultipart();
mp.addBodyPart(mbp1);
mp.addBodyPart(mbp2);
msg.setContent(mp);
msg.setSentDate(new Date());
Transport.send(msg);
return true;
catch statements

Answer 1

Correct, a JAR Executable, no i did not enter the mail.jar and activation.jar as "Class Path" files in the app jar. i used the following command:
C:\j2sdk_nb\j2sdk1.4.2\bin\jar vcm0f mainClass4.txt ZipperS.jar C:\javamail-1_3_1\mail.jar C:\jaf-1_0_2\activation.jar ZipperS.class (more classes)
where the file mainClass4.txt contains:
Main-Class: ZipperS
How do you specify mail.jar and activation.jar as class path entries?
thanks