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I am creating a larger program that will have emails sent to the users account whenever an event happens, and right now I am just focusing on making the email sending work.

Right now, I have it functioning perfectly in the IDE (IntelliJ) with no errors or warnings, but after I jar the file and run it in the terminal I get an error every time the program tries to send an email.

I am assuming I jarred the file wrong since it works in the IDE perfectly fine, but I am not too sure. I have looked up similar issues to mine but have not found a working solution.

This is the file that has issues in the terminal

package handler;

import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMessage.RecipientType;
import java.util.Properties;

public class Sender 

 private Sender()

 private static final String SENDERS_GMAIL = "myemail@email.com";
 private static final String SENDERS_PASSWORD = "mypassword";

 private static final String RECEIEVES_EMAIL = "myemail@email.com";

 private static Properties mailServerProperties;
 private static Session mailSession;
 private static MimeMessage mailMessage;

 public static void sendMail(String emailBody) throws Throwable
 
 mailServerProperties = System.getProperties();
 mailServerProperties.put("mail.smtp.port", "587");
 mailServerProperties.put("mail.smtp.auth", "true");
 mailServerProperties.put("mail.smtp.starttls.enable", "true");

 mailSession = Session.getDefaultInstance(mailServerProperties);

 mailMessage = new MimeMessage(mailSession);
 mailMessage.addRecipient(RecipientType.BCC, new InternetAddress(RECEIEVES_EMAIL));
 mailMessage.setSubject("Test Email");
 mailMessage.setContent(emailBody, "text/html");

 Transport transport = mailSession.getTransport("smtp");
 transport.connect("smtp.gmail.com", SENDERS_GMAIL, SENDERS_PASSWORD);
 transport.sendMessage(mailMessage, mailMessage.getAllRecipients());
 transport.close();
 

And whenever I run the .jar in the terminal, this is the error I get:

 C:UsersgenlapEmailSender>java -jar SendEmail.jar
javax.mail.NoSuchProviderException: No provider for smtp
 at javax.mail.Session.getProvider(Session.java:460)
 at javax.mail.Session.getTransport(Session.java:655)
 at javax.mail.Session.getTransport(Session.java:636)
 at handler.Sender.sendMail(Sender.java:37)
 at handler.ManageService.run(ManageService.java:32)
 at java.lang.Thread.run(Unknown Source)
Message failed to be sent.

The line in the Sender file that is being called out in the error is

Transport transport = mailSession.getTransport("smtp");

Does anybody know how I can solve this?

You are either not including the dependencies in the SendEmail.jar or it lacks MANIFEST.MF entries which point to them. Due to that dependencies which IntelliJ is using for building and running the application are not available when you are executing java -jar from the command line.

The easiest way would be to create a fat JAR with all dependencies. If you use Maven you can take a look at this answer or use Maven Shade Plugin.

If you're creating your application by taking the class files out of the JavaMail jar file and putting them in your application jar file, then you're missing all the META-INF files from the JavaMail jar file. The best approach is to find a solution that does not require repackaging the JavaMail jar file, such as One-JAR.