Question

When using the Java mail API, the MessagingException is often caught in the catch block rather than other Java exceptions that are related to the use of the Java mail API. Why is this?

Answer 1

Please follow the data and description :

Java Mail API :

In the stream of the java programming we use the JavaMail API to send various kinds of emails using the SMTP server with no authentication, or even with the TLS and SSL authentication, this could also help us to send the attachments with the use of files and images in the email body. JavaMail API is not a part of the standard JDK library, so we will have to download it and then add it to the program as an import to use the respective methods in the API.

Let us consider a sample mail program that sends an email to the recepient as shown below,

Example :

import java.io.*;
import java.util.*;
import javax.activation.*;
import javax.mail.*;
import javax.mail.internet.*;

public class EmailUtil {

   public static void sendEmail(Session session, String toEmail, String subject, String body){
       try
   {
   MimeMessage mimeMsg = new MimeMessage(session);
   //set message headers
   mimeMsg.addHeader("Content-type", "text/HTML; charset=UTF-8");
   mimeMsg.addHeader("format", "flowed");
   mimeMsg.addHeader("Content-Transfer-Encoding", "8bit");

   mimeMsg.setFrom(new InternetAddress("[email protected]", "NoReply-JD"));

   mimeMsg.setReplyTo(InternetAddress.parse("[email protected]", false));

   mimeMsg.setSubject(subject, "UTF-8");

   mimeMsg.setText(body, "UTF-8");

   mimeMsg.setSentDate(new Date());

   mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toEmail, false));
   System.out.println("Message is ready");
   Transport.send(mimeMsg);

   System.out.println("EMail Sent Successfully!!");
   }
   catch (MessagingException e) {
   e.printStackTrace();
   }
   }
}

In the above as seen we can come to a conclusion that the exception that is throwed or caught in the code is an MessagingException which mainly returns any kind of the exception regarding the authentication, sending and reporting the mails and the connecions which is everything related to the API of JavaMail. And OfCourse the regular exception would arise but the connections and the related dat and its implemntations needs to be done using the JavaMail API. So the MessagingException is generally caught in the catch exception of a Mail sending code.

Hope this is helpful.