Javamail - type exception

[Rich Stepanski]

I've written a program that uses the javax.mail jar to send email. The program works fine on my desktop computer - but when moved to another station, the Transport.send() method throws an Unsupported Type Exception. Saying therei s no DCH object for my MIME object.
I've seen several posts around with similar problems - the only suggestions are to check the class path. I'm using a jar with all of my mail jars inside, so I don't do any class path setting.
Does anyone know of any hardware problems that could cause this? I was able to open outlook on the other station and send a message.
Here is a cropped portion of the code...

  
 Properties props = new Properties();
            props.put("mail.smtp.host", "gwia.ugi.com");
            //props.put("mail.host","gwia.ugi.com");
            //props.put("mail.transport.protocol","smtp");            
 
            System.out.println("try to get session object");
            Session session = Session.getInstance(props);
            
            try{
                Message msg = new MimeMessage(session);
                
                InternetAddress[] address = { new  InternetAddress(DESTINATION)  };
                msg.setRecipients( Message.RecipientType.TO, address );
                msg.setSubject("Daily SysOp Log :"+new Date().toString());
                msg.setSentDate(new Date());
                msg.setText(message.toString());                
 
                System.out.println("Trying to send");
                Transport.send(msg);

[Lewin Chan]

No DataContentHandler, well the only solution to that is to check your classpath... That's almost always the problem, regardless of how sure you are, I really would go and check it again.

I think in one of the jars somewhere there will be a META-INF/mime.types or mime.defaults file, which IIRC tells you the supported mime-types. Perhaps you have conflicting mime.types files due to the installation of java on that 2nd machine.