mail.setFrom("teste.email.send@gmail.com", "Teste");
        mail.setSubject("E-mail exemplo");
        mail.setMsg("E-mail de exemplo");
        mail.setSSLOnConnect(true);
        mail.setAuthentication("teste.email.send@gmail.com", "********");
        mail.setHostName("smtp.gmail.com");

        mail.addTo("meu.email@gmail.com", "Lucas Souza");
        mail.setSmtpPort(587);
        mail.send();

    } catch (EmailException ex) {
        Logger.getLogger(Email.class.getName()).log(Level.SEVERE, null, ex);
    }

org.apache.commons.mail.EmailException: Sending the email to the following server failed : smtp.gmail.com:465