How do I send an email in java and gmail using bluej

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Java

email

I am trying to send an email via Java for an assignment. I have to send the email then take a screenshot of the email and send it to my teacher.

What I have tried:

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

public class SendEmail {

   public static void main(String [] args) {    
      // Recipient's email ID needs to be mentioned.
      String to = "***************@gmail.com";//Had actual email here, it is censored

      // Sender's email ID needs to be mentioned
      String from = "*********.**********@********.org";//Had actual email here, it is censored

      // Assuming you are sending email from localhost
      String host = "localhost";//I also tried my own IP address

      // Get system properties
      Properties properties = System.getProperties();

      // Setup mail server
      properties.setProperty("mail.smtp.host", host);

      // Get the default Session object.
      Session session = Session.getDefaultInstance(properties);

      try {
         // Create a default MimeMessage object.
         MimeMessage message = new MimeMessage(session);

         // Set From: header field of the header.
         message.setFrom(new InternetAddress(from));

         // Set To: header field of the header.
         message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

         // Set Subject: header field
         message.setSubject("Testing...");

         // Now set the actual message
         message.setText("Did it go through?");

         // Send message
         Transport.send(message);
         System.out.println("Sent message successfully....");
      } catch (MessagingException mex) {
         mex.printStackTrace();
      }
   }
}

The code comiles correctly, but I get this.

Caused by: java.net.ConnectException: Connection refused (Connection refused)<br />
	at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)<br />
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)<br />
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)<br />
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)<br />
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)<br />
	at java.base/java.net.Socket.connect(Socket.java:609)<br />
	at java.base/java.net.Socket.connect(Socket.java:558)<br />
	at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:359)<br />
	at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238)<br />
	at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2175)<br />
	... 15 more

Am I doing it wrong, do I have the wrong files, or is the BlueJ IDE wrong?