JavaMail Attachment Error

[Jon Parise]

Hello everyone,

I'm working on adding some e-mailing capability to an existing reporting application.

I am able to generate a report and send it using JavaMail, however I can't seem to get the MIME types right. Know know the 5 MIME types I needs for the 5 formats I support, but they all are sent as .dat files. Upon arrival, if I convert the .dat file to the proper extensions(On Windows) then I can open the file just fine.

I tries using the MIMEBodyPart class's setContent method, but it keeps telling me:

javax.activation.UnsupportedDataTypeException: no object DCH for MIME type application/pdf

It says the same for all my other MIME Types, expect with the correct MIME type listed.

Here is the code:

protected void sendEmail(){
        try {
            Properties props = new Properties();
            props.put("mail.smtp.host", "server.domain.com");
            Session session = Session.getDefaultInstance(props, null);
            Message message = new MimeMessage(session);
            Multipart multipart = new MimeMultipart();
            BodyPart messageTextPart = new MimeBodyPart();
 
            messageTextPart.setText("Report is attached");
 
            message.setFrom(new InternetAddress(fromAddress, "Sender"));
 
            for(String r : this.recipients){
                message.addRecipient(Message.RecipientType.TO, new InternetAddress(r));
            }
          
            message.setSubject("New Report: " + this.title);
            message.setSentDate(new java.util.Date());
 
            //Add the attachment
            DataSource source = new FileDataSource(this.path);
            BodyPart attachmentPart = new MimeBodyPart();
            Header header = this.getMIMEHeader();
            attachmentPart.setHeader(header.getName(), header.getValue());
            attachmentPart.setDisposition(Part.ATTACHMENT);
            attachmentPart.setDataHandler(new DataHandler(source));
            //attachmentPart.set
            multipart.addBodyPart(messageTextPart);
            multipart.addBodyPart(attachmentPart);
 
            message.setContent(multipart);
 
            Transport.send(message);
 
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(AbstractReport.class.getName()).log(Level.SEVERE, null, ex);
        } catch (MessagingException ex) {
            Logger.getLogger(AbstractReport.class.getName()).log(Level.SEVERE, null, ex);
        }
  }

Please note that getMIMEHeader returns a new javax.mail.Header object that has the value set to the MIMtype String.

Also, recipients is an ArrayList of type String that contains a listing of everyone the e-mail should be send to.

Thanks,

Jon
[ December 09, 2008: Message edited by: Jon Parise ]

[Mark Vedder]

I don't know if this will help any... I've always used the Apache Commons Email API when working with e-mail. It wraps the Java Mail API. I've always heard that working with the Java Mail API directly can be tricky. I've used Apache Commons Email for attachments as well. At the very least, you might be able to look at their source code (since it's open source) and see how they handle attachments and see if you are missing something. Anyhow, since I had not seen anyone reply to you yet, I thought that suggestion might help.

[Jon Parise]

Thanks for letting me know about Commons. I'll give that a try, it does appear to be easier to use.

I am still curious about getting Java Mail to send nice attachments, so if anyone has a solution I would be interested to see.

Thanks again,

Jon