/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package Controlador;

import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class ControladorEmail {

    /**
     * Envia un email con la cuenta detallada dentro de este metodo.
     *
     * @param destino El email al que se le enviara el email.
     * @param titulo El titulo del email.
     * @param mensaje El mensaje del email.
     */
    public void enviarEmail(String destino, String titulo, String mensaje) {

        final String username = "angelowolf21@gmail.com";
        final String password = "telacreiste";

        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");

        Session session = Session.getInstance(props,
                new javax.mail.Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        try {
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(username));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(destino));
            message.setSubject(titulo);
            message.setText(mensaje);
            Transport.send(message);

        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }

}

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package Controlador;

import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class ControladorEmail {

    /**
     * Envia un email con la cuenta detallada dentro de este metodo.
     *
     * @param destino El email al que se le enviara el email.
     * @param titulo El titulo del email.
     * @param mensaje El mensaje del email.
     */
    public void enviarEmail(String destino, String titulo, String mensaje) {

        final String username = "email@gmail.com";
        final String password = "clave123456";

        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");

        Session session = Session.getInstance(props,
                new javax.mail.Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        try {
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(username));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(destino));
            message.setSubject(titulo);
            message.setText(mensaje);
            Transport.send(message);

        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }

}

Update ControladorEmail.java