Search code examples
javainheritanceoverridingjakarta-mail

Overriding java internals methods

I have a class say TestEmail which has a sendEmail() method

Now the sendEmail method calls an apache commons method which internally call methods from the javax.mail package. I want to override one of the internal methods. I am providing the code flow below:

TestEmail.sendEmail()->
commons.Email.send()->commons.Email.sendMIMEMessage()->
javax.mail.Transport.send()->javax.mail.Transport(){saveChanges()}-> 
javax.mail.MimeMessage.updateHeaders()->updateMessageID()

I want to override the updateMessageID method. within my TestEmail class. Is it possible? How?

Solution

  • Looks like you would just override Email.createMimeMessage(Session) in which ever subclass of Email that you are using. Then have createMimeMessage return a subclass of javax.mail.MimeMessage that overrides updateMessageID to do what you want. If you just need to remove the userid then there are other ways to do that. See: Override Message-ID by configuration for details.