问题
This program attempts to send e-mail but throws a run time exception:
javax.mail.AuthenticationFailedException: failed to connect, no password specified?
Why am I getting this exception when I have supplied the correct username and password for authentication?
Both the sender and receiver have g-mail accounts. The sender and the receiver both have g-mail accounts. The sender has 2-step verification process disabled.
This is the code:
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
class tester {
public static void main(String args[]) {
Properties props = new Properties();
props.put("mail.smtp.host" , "smtp.gmail.com");
props.put("mail.stmp.user" , "username");
//To use TLS
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.password", "password");
//To use SSL
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.getDefaultInstance( props , null);
String to = "me@gmail.com";
String from = "from@gmail.com";
String subject = "Testing...";
Message msg = new MimeMessage(session);
try {
msg.setFrom(new InternetAddress(from));
msg.setRecipient(Message.RecipientType.TO,
new InternetAddress(to));
msg.setSubject(subject);
msg.setText("Working fine..!");
Transport transport = session.getTransport("smtp");
transport.connect("smtp.gmail.com" , 465 , "username", "password");
transport.send(msg);
System.out.println("fine!!");
}
catch(Exception exc) {
System.out.println(exc);
}
}
}
Even after giving the password I get the exception. Why is it not authenticating?
回答1:
Try to create an javax.mail.Authenticator Object, and send that in with the properties object to the Session object.
Authenticator edit:
You can modify this to accept a username and password and you can store them there, or where ever you want.
public class SmtpAuthenticator extends Authenticator {
public SmtpAuthenticator() {
super();
}
@Override
public PasswordAuthentication getPasswordAuthentication() {
String username = "user";
String password = "password";
if ((username != null) && (username.length() > 0) && (password != null)
&& (password.length () > 0)) {
return new PasswordAuthentication(username, password);
}
return null;
}
In your class where you send the email:
SmtpAuthenticator authentication = new SmtpAuthenticator();
javax.mail.Message msg = new MimeMessage(Session
.getDefaultInstance(emailProperties, authenticator));
回答2:
You need to add the Object Authentication as the Parameter to the Session. such as
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator(){
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(
"XXXX@gmail.com", "XXXXX");// Specify the Username and the PassWord
}
});
now You will not get this kind of Exception....
javax.mail.AuthenticationFailedException: failed to connect, no password specified?
回答3:
Your email session should be provided an authenticator instance as below
Session session = Session.getDefaultInstance(props,
new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(
"myemail@gmail.com", "password");
}
});
a complete example is here http://bharatonjava.wordpress.com/2012/08/27/sending-email-using-java-mail-api/
回答4:
In addition to RMT's answer. I also had to modify the code a bit.
- Transport.send should be accessed statically
- therefor, transport.connect did not do anything for me, I only needed to set the connection info in the initial Properties object.
here is my sample send() methods. The config object is just a dumb data container.
public boolean send(String to, String from, String subject, String text) {
return send(new String[] {to}, from, subject, text);
}
public boolean send(String[] to, String from, String subject, String text) {
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.host", config.host);
props.put("mail.smtp.user", config.username);
props.put("mail.smtp.port", config.port);
props.put("mail.smtp.password", config.password);
Session session = Session.getInstance(props, new SmtpAuthenticator(config));
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
InternetAddress[] addressTo = new InternetAddress[to.length];
for (int i = 0; i < to.length; i++) {
addressTo[i] = new InternetAddress(to[i]);
}
message.setRecipients(Message.RecipientType.TO, addressTo);
message.setSubject(subject);
message.setText(text);
Transport.send(message);
} catch (MessagingException e) {
e.printStackTrace();
return false;
}
return true;
}
回答5:
I've solved this issue adding user and password in Transport.send call:
Transport.send(msg, "user", "password");
According to this signature of the send function in javax.mail (from version 1.5):
public static void send(Message msg, String user, String password)
Also, if you use this signature it's not necessary to set up any Authenticator, and to set user and password in the Properties (only the host is needed). So your code could be:
private void sendMail(){
try{
Properties prop = System.getProperties();
prop.put("mail.smtp.host", "yourHost");
Session session = Session.getInstance(prop);
Message msg = #createYourMsg(session, from, to, subject, mailer, yatta yatta...)#;
Transport.send(msg, "user", "password");
}catch(Exception exc) {
// Deal with it! :)
}
}
回答6:
It might be worth verifying that the gmail account hasn't been locked out due to several unsuccessful login attempts, you may need to reset your password. I had the same problem as you, and this turned out to be the solution.
回答7:
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.InternetAddress;
import javax.mail.internet.MimeMessage;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
@SuppressWarnings("serial")
public class RegisterAction {
public String execute() {
RegisterAction mailBean = new RegisterAction();
String subject="Your username & password ";
String message="Hi," + username;
message+="\n \n Your username is " + email;
message+="\n \n Your password is " + password;
message+="\n \n Please login to the web site with your username and password.";
message+="\n \n Thanks";
message+="\n \n \n Regards";
//Getting FROM_MAIL
String[] recipients = new String[1];
recipients[0] = new String();
recipients[0] = customer.getEmail();
try{
mailBean.sendMail(recipients,subject,message);
return "success";
}catch(Exception e){
System.out.println("Error in sending mail:"+e);
}
return "failure";
}
public void sendMail( String recipients[ ], String subject, String message)
throws MessagingException
{
boolean debug = false;
//Set the host smtp address
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.starttls.enable", true);
props.put("mail.smtp.auth", true);
// create some properties and get the default Session
Session session = Session.getDefaultInstance(props, new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(
"username@gmail.com", "5373273437543");// Specify the Username and the PassWord
}
});
session.setDebug(debug);
// create a message
Message msg = new MimeMessage(session);
InternetAddress[] addressTo = new InternetAddress[recipients.length];
for (int i = 0; i < recipients.length; i++)
{
addressTo[i] = new InternetAddress(recipients[i]);
}
msg.setRecipients(Message.RecipientType.TO, addressTo);
// Optional : You can also set your custom headers in the Email if you Want
//msg.addHeader("MyHeaderName", "myHeaderValue");
// Setting the Subject and Content Type
msg.setSubject(subject);
msg.setContent(message, "text/plain");
//send message
Transport.send(msg);
System.out.println("Message Sent Successfully");
}
}
回答8:
Even when using an Authenticator I had to set mail.smtp.auth property to true. Here is a working example:
final Properties props = new Properties();
props.put("mail.smtp.host", config.getSmtpHost());
props.setProperty("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(props, new javax.mail.Authenticator()
{
protected PasswordAuthentication getPasswordAuthentication()
{
return new PasswordAuthentication(config.getSmtpUser(), config.getSmtpPassword());
}
});
回答9:
I also have this problem so don't worry. It comes from mail server side due to an outside authentication issue. Open your mail and you will get a mail from the mail server telling you to enable accessibility. When you have done that, retry your program.
回答10:
Turn On "Access for less secure apps" in Security setting for the gmail account.(from mail), see the below link for references
http://www.ghacks.net/2014/07/21/gmail-starts-block-less-secure-apps-enable-access/
回答11:
This error may be about password characters. If your password contains special characters and also you add your password into Transport class methods;
For Example
Transport transport = session.getTransport("smtp");
transport.connect("user","passw@rd");
or
Transport.send(msg, "user", "passw%rd");
you may get that error. Because Transport class' methods may not handle special characters. If you add your username and password into your message using javax.mail.PasswordAuthentication class, i hope you will escape that error;
For Example
...
Session session = Session.getInstance(props, new javax.mail.Authenticator()
{
protected PasswordAuthentication getPasswordAuthentication()
{
return new PasswordAuthentication("user", "pas$w@r|d");
}
});
Message message = new MimeMessage(session);
...
Transport.send(message);
回答12:
See the 9 line of your code,it may be an error; it should be:
mail.smtp.user
not
mail.stmp.user;
回答13:
I have just faced this problem, and the solution is that the property "mail.smtp.user" should be your email (not username).
The example for gmail user:
properties.put("mail.smtp.starttls.enable", "true");
properties.put("mail.smtp.host", host);
properties.put("mail.smtp.user", from);
properties.put("mail.smtp.password", pass);
properties.put("mail.smtp.port", "587");
properties.put("mail.smtp.auth", "true");
来源：https://stackoverflow.com/questions/6610572/javax-mail-authenticationfailedexception-failed-to-connect-no-password-specifi