Envoyer mon premier mail

bonsoir Tous le monde,
avant d'érire ce post j'ai beaucoup essayé pour envoyé un mail
j'ai trouvé ce bout de code
EmailUtility.java

Code:

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package net.codejava.email;
 
import java.util.Date;
import java.util.Properties;
 
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
 
/**
 * A utility class for sending e-mail messages
 * @author www.codejava.net
 *
 */
public class EmailUtility {
	public static void sendEmail(String host, String port,
			final String userName, final String password, String toAddress,
			String subject, String message) throws AddressException,
			MessagingException {
 
		// sets SMTP server properties
		Properties properties = new Properties();
		properties.put("mail.smtp.host", host);
		properties.put("mail.smtp.port", port);
		properties.put("mail.smtp.auth", "true");
		properties.put("mail.smtp.starttls.enable", "true");
 
		// creates a new session with an authenticator
		Authenticator auth = new Authenticator() {
			public PasswordAuthentication getPasswordAuthentication() {
				return new PasswordAuthentication(userName, password);
			}
		};
 
		Session session = Session.getInstance(properties, auth);
 
		// creates a new e-mail message
		Message msg = new MimeMessage(session);
 
		msg.setFrom(new InternetAddress(userName));
		InternetAddress[] toAddresses = { new InternetAddress(toAddress) };
		msg.setRecipients(Message.RecipientType.TO, toAddresses);
		msg.setSubject(subject);
		msg.setSentDate(new Date());
		msg.setText(message);
 
		// sends the e-mail
		Transport.send(msg);
 
	}
}

EmailSendingServlet.jsp

Code:

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package net.codejava.email;
 
import java.io.IOException;
 
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * A servlet that takes message details from user and send it as a new e-mail
 * through an SMTP server.
 * 
 * @author www.codejava.net
 * 
 */
@WebServlet("/EmailSendingServlet")
public class EmailSendingServlet extends HttpServlet {
	private String host;
	private String port;
	private String user;
	private String pass;
 
	public void init() {
		// reads SMTP server setting from web.xml file
		ServletContext context = getServletContext();
		host = context.getInitParameter("host");
		port = context.getInitParameter("port");
		user = context.getInitParameter("user");
		pass = context.getInitParameter("pass");
	}
 
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// reads form fields
		String recipient = request.getParameter("recipient");
		String subject = request.getParameter("subject");
		String content = request.getParameter("content");
 
		String resultMessage = "";
 
		try {
			EmailUtility.sendEmail(host, port, user, pass, recipient, subject,
					content);
			resultMessage = "The e-mail was sent successfully";
		} catch (Exception ex) {
			ex.printStackTrace();
			resultMessage = "There were an error: " + ex.getMessage();
		} finally {
			request.setAttribute("Message", resultMessage);
			getServletContext().getRequestDispatcher("/Result.jsp").forward(
					request, response);
		}
	}
}

EmailForm.jsp

Code:

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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Send an e-mail</title>
</head>
<body>
	<form action="EmailSendingServlet" method="post">
		<table border="0" width="35%" align="center">
			<caption><h2>Send New E-mail</h2></caption>
			<tr>
				<td width="50%">Recipient</td>
				<td><input type="text" name="recipient" size="50"/></td>
			</tr>
			<tr>
				<td>Subject </td>
				<td><input type="text" name="subject" size="50"/></td>
			</tr>
			<tr>
				<td>Content </td>
				<td><textarea rows="10" cols="39" name="content"></textarea> </td>
			</tr>
			<tr>
				<td colspan="2" align="center"><input type="submit" value="Send"/></td>
			</tr>
		</table>
 
	</form>
</body>
</html>

Result.jsp

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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
	 "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Result</title>
</head>
<body>
	<center>
		<h3><%=request.getAttribute("Message")%></h3>
	</center>
</body>
</html>

web.xml

Code:

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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
        http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="WebApp_ID" version="3.0">
    <display-name>EmailSendingWebApp</display-name>
 
    <!-- SMTP settings -->
    <context-param>
        <param-name>host</param-name>
        <param-value>smtp.gmail.com</param-value>
    </context-param>
 
    <context-param>
        <param-name>port</param-name>
        <param-value>587</param-value>
    </context-param>
 
    <context-param>
        <param-name>user</param-name>
        <param-value>YOUR_EMAIL</param-value>
    </context-param>
 
    <context-param>
        <param-name>pass</param-name>
        <param-value>YOUR_PASSWORD</param-value>
    </context-param>
 
    <welcome-file-list>
        <welcome-file>EmailForm.jsp</welcome-file>
    </welcome-file-list>
</web-app>

mais le serveur tomcat m'indique cette erreur : There were an error: Could not convert socket to TLS

Code:

javax.mail.MessagingException: Could not convert socket to TLS;

merci de m'aider a envoyer mon premier mail
merci pour la réponse