geronimo-mail_2.1_spec/src/main/java/jakarta/mail/internet/MimeBodyPart.java [572:589]:
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            if (contentType.match("multipart/*")) {
                // the content is suppose to be a MimeMultipart.  Ping it to update it's headers as well.
                try {
                    final MimeMultipart part = (MimeMultipart)handler.getContent();
                    part.updateHeaders();
                } catch (final ClassCastException e) {
                    throw new MessagingException("Message content is not MimeMultipart", e);
                }
            }
            else if (!contentType.match("message/rfc822")) {
                // simple part, we need to update the header type information
                // if no encoding is set yet, figure this out from the data handler.
                if (getSingleHeader("Content-Transfer-Encoding") == null) {
                    setHeader("Content-Transfer-Encoding", MimeUtility.getEncoding(handler));
                }

                // is a content type header set?  Check the property to see if we need to set this.
                if (explicitType == null) {
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geronimo-mail_2.1_spec/src/main/java/jakarta/mail/internet/MimeMessage.java [1521:1538]:
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            if (contentType.match("multipart/*")) {
                // the content is suppose to be a MimeMultipart.  Ping it to update it's headers as well.
                try {
                    final MimeMultipart part = (MimeMultipart)handler.getContent();
                    part.updateHeaders();
                } catch (final ClassCastException e) {
                    throw new MessagingException("Message content is not MimeMultipart", e);
                }
            }
            else if (!contentType.match("message/rfc822")) {
                // simple part, we need to update the header type information
                // if no encoding is set yet, figure this out from the data handler content.
                if (getSingleHeader("Content-Transfer-Encoding") == null) {
                    setHeader("Content-Transfer-Encoding", MimeUtility.getEncoding(handler));
                }

                // is a content type header set?  Check the property to see if we need to set this.
                if (explicitType == null) {
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