I'm trying to attach a pdf to an email and store it in an imap folder.

I can create and store the email, but I can't get the pdf attachment to work.

I get the error in the subject line.

Here's some exception output:

javax.mail.MessagingException: IOException while appending messages;
  nested exception is:
        javax.activation.UnsupportedDataTypeException: no object DCH for MIME 
type application/pdf
        at com.sun.mail.imap.IMAPFolder.appendMessages(IMAPFolder.java:1415)
        at 
com.yourcompany.EmailAllReportsTask.performAction(EmailAllReportsTask.java:309)
        at 
er.extensions.concurrency.ERXLongResponseTask$DefaultImplementation.run(ERXLongResponseTask.java:165)
        at java.lang.Thread.run(Thread.java:680)
        at 
er.extensions.concurrency.ERXLongResponseTask$WorkerThread.run(ERXLongResponseTask.java:63)
Caused by: javax.activation.UnsupportedDataTypeException: no object DCH for 
MIME type application/pdf

The error occurs when I try to add the message to the folder (the last line in 
this code sample) (yes, I'm going direct to the javamail apis at this point):

               ...
                // Part two is attachment
                messageBodyPart = new MimeBodyPart();
                // DataSource source = new FileDataSource("smith");
                messageBodyPart.setContent(reportOutput, "application/pdf");
                messageBodyPart.setHeader("Content-Type", "application/pdf; 
name=\"ASuperPDF.pdf\"");
                messageBodyPart.setFileName("ASuperPDF.pdf");
                multipart.addBodyPart(messageBodyPart);

                // Put parts in message
                msg.setContent(multipart);

                drafts.appendMessages(new Message[] {msg});

I've tried some things I found on the Internets, such as adding this line:

                Thread.currentThread().setContextClassLoader( 
getClass().getClassLoader() );

I was wondering if anybody has run into a similar situation and has a solution.

John

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