java mail issue

2022-04-28T09:41:21Z

in liferay ce 7.4 ga19

i use javax.mail in build.gradle

dependencies {
	compileOnly group: "com.liferay.portal", name: "release.portal.api"
	compileOnly group: "javax.mail", name: "javax.mail-api", version: "1.4.4"
	cssBuilder group: "com.liferay", name: "com.liferay.css.builder", version: "3.0.2"

}

in service-builder module, it work fine, i can creating file and put it as attachment.

but in my mvc-module, it can not work when i add file

			MailMessage mailMessage = new MailMessage();
			InternetAddress from = new InternetAddress(Constant.DEFAULT_MAIL_SENDER_ADDRESS);
			from.setPersonal(Constant.DEFAULT_MAIL_SENDER_PERSONAL);
			mailMessage.setFrom(from);
			mailMessage.setHTMLFormat(true);

			mailMessage.setBody(message.toString());
			mailMessage.setSubject("test notice");
			mailMessage.setTo(internetAddressArrayList.toArray(new InternetAddress[internetAddressArrayList.size()]));
			mailMessage.addFileAttachment(vmiInfoRecordFileData);
			MailEngine.send(mailMessage);

same code, but it just doesn't work in portlet class when i add file attachment.

the exception

com.liferay.portal.kernel.log.LogSanitizerException: javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/mixed; __   boundary="----=_Part_28_382286606.1651138290581" [Sanitized]
   at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:896) ~[?:1.8.0_202]
   at javax.activation.DataHandler.writeTo(DataHandler.java:317) ~[?:1.8.0_202]
   at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1670) ~[mail.jar:1.6.6-SNAPSHOT]
   at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1889) ~[mail.jar:1.6.6-SNAPSHOT]
   at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1300) ~[mail.jar:1.6.6-SNAPSHOT]
   at com.liferay.petra.mail.MailEngine._send(MailEngine.java:635) ~[com.liferay.petra.mail.jar:?]

i also try use api

	public static void send(
			InternetAddress from, InternetAddress[] to, InternetAddress[] cc,
			InternetAddress[] bcc, InternetAddress[] bulkAddresses,
			String subject, String body, boolean htmlFormat,
			InternetAddress[] replyTo, String messageId, String inReplyTo,
			List<FileAttachment> fileAttachments)

it doesn't work too.

but after i put

MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap(); 
mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html"); 
mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml"); 
mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain"); 
mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed"); 
mc.addMailcap("message/rfc822;; x-java-content- handler=com.sun.mail.handlers.message_rfc822");

befor i send it, it work.

i'd like know why same code have different response. thanks in advance.