How to resolve javax mail AuthenticationFailedException issue

Question

I am doing a sendMail Servlet with JavaMail  I have javax mail AuthenticationFailedException on my output  Can anyone please help me out  Thanks   sendMailServlet code   try           String host    smtp gmail com           String from    my gmail com           String pass    pass           Properties props   System getProperties            props put  mail smtp starttls enable    true            props put  mail smtp host   host           props put  mail smtp user   from           props put  mail smtp password   pass           props put  mail smtp port    587            props put  mail smtp auth    true            props put  mail debug    true             Session session   Session getDefaultInstance props  null           MimeMessage message   new MimeMessage session           Address fromAddress   new InternetAddress from           Address toAddress   new InternetAddress  test1 gmail com             message setFrom fromAddress           message setRecipient Message RecipientType TO  toAddress            message setSubject  Testing JavaMail            message setText  Welcome to JavaMail            Transport transport   session getTransport  smtp            transport connect host  from  pass           message saveChanges            Transport send message           transport close          catch Exception ex            out println   lt html gt  lt head gt  lt  head gt  lt body gt             out println  ERROR      ex           out println   lt  body gt  lt  html gt             Output on GlassFish 2 1   DEBUG SMTP  trying to connect to host  smtp gmail com   port 587  isSSL false 220 mx google com ESMTP 36sm10907668yxh 13 DEBUG SMTP  connected to host  smtp gmail com   port  587 EHLO platform-4cfaca 250-mx google com at your service   203 126 159 130  250-SIZE 35651584 250-8BITMIME 250-STARTTLS 250-ENHANCEDSTATUSCODES 250 PIPELINING DEBUG SMTP  Found extension  SIZE   arg  35651584  DEBUG SMTP  Found extension  8BITMIME   arg    DEBUG SMTP  Found extension  STARTTLS   arg    DEBUG SMTP  Found extension  ENHANCEDSTATUSCODES   arg    DEBUG SMTP  Found extension  PIPELINING   arg    STARTTLS 220 2 0 0 Ready to start TLS EHLO platform-4cfaca 250-mx google com at your service   203 126 159 130  250-SIZE 35651584 250-8BITMIME 250-AUTH LOGIN PLAIN 250-ENHANCEDSTATUSCODES 250 PIPELINING DEBUG SMTP  Found extension  SIZE   arg  35651584  DEBUG SMTP  Found extension  8BITMIME   arg    DEBUG SMTP  Found extension  AUTH   arg  LOGIN PLAIN  DEBUG SMTP  Found extension  ENHANCEDSTATUSCODES   arg    DEBUG SMTP  Found extension  PIPELINING   arg    DEBUG SMTP  Attempt to authenticate AUTH LOGIN 334 VXNlcm5hbWU6 aWpveWNlbGVvbmdAZ21haWwuY29t 334 UGFzc3dvcmQ6 MTIzNDU2Nzhf 235 2 7 0 Accepted DEBUG  getProvider   returning javax mail Provider TRANSPORT smtp com sun mail smtp SMTPTransport Sun Microsystems  Inc  DEBUG SMTP  useEhlo true  useAuth true

User · Answer

The problem is  you are creating a transport object and using it s connect method to authenticate yourself          But then you use a static method to send the message which ignores authentication done by the object   So  you should either use the sendMessage message  message getAllRecipients    method on the object or use an authenticator as suggested by others to get authorize          through the session   Here s the Java Mail FAQ  you need to read

User · Answer

When you are trying to sign in to your Google Account from your new device or application you have to unlock the CAPTCHA   To unlock the CAPTCHA go to https   www google com accounts DisplayUnlockCaptcha and then   And also make sure to allow less secure apps on

User · Answer

I was missing this authenticator object argument in the below line  Session session   Session getInstance props  new GMailAuthenticator username  password      This line solved my problem now I can send mail through my Java application   Rest of the code is simple just like above

User · Answer

You need to implement a custom Authenticator  import javax mail Authenticator  import javax mail PasswordAuthentication    class GMailAuthenticator extends Authenticator        String user       String pw       public GMailAuthenticator  String username  String password                 super            this user   username          this pw   password             public PasswordAuthentication getPasswordAuthentication                return new PasswordAuthentication user  pw             Now use it in the Session  Session session   Session getInstance props  new GMailAuthenticator username  password      Also check out the JavaMail FAQ

User · Answer

This error is from google security    This Can Be Resolved by Enabling Less Secure    Go To This Link    https   www google com settings security lesssecureapps  and Make  TURN ON  then your application runs For Sure

User · Answer

Just wanted to share with you  I happened to get this error after changing Digital Ocean machine  IP address   Apparently Gmail recognized it as a hacking attack  After following their directions  and approving the new IP address the code is back and running

[java] How to resolve javax.mail.AuthenticationFailedException issue?

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