I'm trying to send an email message via GMail (Google Apps, actually). This works perfectly for normal messages, but of course I have to test the extremes.
Right now I'm trying to send a message without a body and I'm getting a strange error message. As I want to eliminate errors in my code, I'd like to know whether I'm doing something wrong or that there is an error in the libraries I'm using.
HtmlEmail currentMessage = new HtmlEmail();
currentMessage.setSSL(true);
currentMessage.setSslSmtpPort(465);
currentMessage.setHostName("smtp.gmail.com");
currentMessage.setAuthentication("[email protected]", "secret");
/** rs is a ResultSet from database **/
if(rs.getString("mailFrom") != null && !rs.getString("mailFrom").isEmpty())
currentMessage.setFrom(rs.getString("mailFrom"));
else
currentMessage.setFrom("[email protected]");
currentMessage.setTo(this.convertRecipientStringToArray(rs.getString("mailTo")));
currentMessage.setCc(this.convertRecipientStringToArray(rs.getString("mailCC")));
currentMessage.setBcc(this.convertRecipientStringToArray(rs.getString("mailBC")));
currentMessage.setSubject(rs.getString("mailSubject"));
if(rs.getString("mailBody") != null && !rs.getString("mailBody").isEmpty())
currentMessage.setTextMsg(rs.getString("mailBody"));
if(rs.getString("mailHtmlBody") != null && !rs.getString("mailHtmlBody").isEmpty())
currentMessage.setHtmlMsg(rs.getString("mailHtmlBody"));
if(rs.getString("mailReplyTo") != null && !rs.getString("mailReplyTo").isEmpty())
currentMessage.addReplyTo(rs.getString("mailReplyTo"));
else
currentMessage.addReplyTo("[email protected]");
currentMessage.send();
This code works for "normal" emails: with a valid body, subject, addressees etc.
When both mailBody and mailHtmlBody are NULL or empty in the databse, I get the following error:
Sending the email to the following server failed : smtp.gmail.com:25
Full error log (own log format) / stacktrace:
[CRITICAL] 2012-12-19 17:08:00 [CET] - Exception occurred in function com.mypackage.mymailobject.outgoing_sendMails: Sending the email to the following server failed : smtp.gmail.com:25
Stack trace:
org.apache.commons.mail.EmailException: Sending the email to the following server failed : smtp.gmail.com:25
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1242)
at org.apache.commons.mail.Email.send(Email.java:1267)
at com.mypackage.mymailobject.outgoing_sendMails(mymailobject.java:85)
at com.mypackage.mymailobject.outgoing_do(mymailobject.java:69)
at com.mypackage.Mailer.main(Mailer.java:132)
Caused by: javax.mail.MessagingException: IOException while sending message;
nested exception is:
java.io.IOException: javax.mail.MessagingException: Empty multipart: multipart/mixed;
boundary="----=_Part_0_916488860.1355933279096"
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1141)
at javax.mail.Transport.send0(Transport.java:195)
at javax.mail.Transport.send(Transport.java:124)
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1232)
... 4 more
Caused by: java.io.IOException: javax.mail.MessagingException: Empty multipart: multipart/mixed;
boundary="----=_Part_0_916488860.1355933279096"
at com.sun.mail.handlers.multipart_mixed.writeTo(multipart_mixed.java:105)
at javax.activation.ObjectDataContentHandler.writeTo(Unknown Source)
at javax.activation.DataHandler.writeTo(Unknown Source)
at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1476)
at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1772)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1099)
... 7 more
I now have 2 questions:
Although I can't find documentation for it, empirical proof shows me that empty bodyparts are not allowed in Apache Commons Email HtmlEmail objects. Either the text message or the html message should be set to a non-empty string.
The error message with port 25 is an error in the code of the Apache Commons Email which doesn't take SSL into account when printing out the smtp port. For this, a bug report has been filed at https://issues.apache.org/jira/browse/EMAIL-123