Question

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.event.*;
import java.net.*;
import java.util.*;
public class servletmail extends HttpServlet
{
public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
{
PrintWriter out=response.getWriter();
response.setContentType("text/html");
try
{
Properties props=new Properties();
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.host","smtp.gmail.com");
props.put("mail.smtp.port", "25");
props.put("mail.smtp.auth", "true");
Authenticator authenticator = new Authenticator()
    {
    protected PasswordAuthentication getPasswordAuthentication() 
        {
        return new PasswordAuthentication("user", "pass");
    }
};
Session sess=Session.getDefaultInstance(props,authenticator);
Message msg=new MimeMessage(sess);
msg.setFrom(new InternetAddress("[e-mail]"));
msg.addRecipient(Message.RecipientType.TO, new InternetAddress("[e-mail]"));
msg.setSubject("Hello JavaMail");
msg.setText("Welcome to JavaMail");
Transport.send(msg);
out.println("mail has been sent");
}
catch(Exception e)
{
System.out.println("err"+e);
}
}
}

im working with above im gettin d following error

servletmail.java:22: reference to Authenticator is ambiguous, both class java.ne
t.Authenticator in java.net and class javax.mail.Authenticator in javax.mail mat
ch
Authenticator authenticator = new Authenticator()
^
servletmail.java:22: reference to Authenticator is ambiguous, both class java.ne
t.Authenticator in java.net and class javax.mail.Authenticator in javax.mail mat
ch
Authenticator authenticator = new Authenticator()
                                  ^
2 errors

i have followed the example in

http://java.sun.com/developer/onlineTraining/JavaMail/contents.html

how should i get the output..will the above code…work
what are the changes that need to be made..im using thunderbird smtp server

Answer 1

The error indicates that there are two possible Authenticator classes which are being referenced here – namely java.net.Authenticator and javax.mail.Authenticator as the error says.

This is because you have imported java.net.* and javax.mail.* and the compiler does not know which Authenticator you need.

Fix this by explicitly importing

import javax.mail.Authenticator;

OR qualify the Authenticator on line 22 as

javax.mail.Authenticator authenticator = new javax.mail.Authenticator()

---

UPDATE

Since you are having problems with sending the mail, first check whether your network admins have given you permissions to connect to the smtpserver at gmail. Are you behind a proxy?

After creating sess, add this line to the code: sess.setDebug(true);

Look at the messages and see how far you get.

Try the other debug tips given at: http://java.sun.com/products/javamail/FAQ.html#debug

UPDATE 2

I’ve tried running your code and it works for me including sending the email.
I had to add one line for props

props.put("mail.smtp.starttls.enable","true");

And of course, change this return new PasswordAuthentication("user", "pass"); to your actual username/password.
And “[e-mail]” to your actual email id.