[Solved]-javax.mail.messagingexception: could not connect to smtp host: smtp.gmail.com, port: 465, response: -1

If you are wokring on project and you're encountering a javax.mail.MessagingException: "Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1."

This error indicates that there is a problem connecting to the SMTP server hosted by Gmail on port 465.

To troubleshoot and resolve this issue, you can try the following steps:

1. Double-check your internet connection to ensure it's stable and functioning properly.
2. Verify that the SMTP server address and port number you are using (smtp.gmail.com:465) are correct.
3. Ensure that your firewall or network settings are not blocking the connection to the SMTP server.
4. If you're using two-factor authentication with your Gmail account, generate an app-specific password and use it for SMTP authentication.
5. Make sure that the username and password you are using to authenticate with the SMTP server are correct.
6. If you're using SSL/TLS to connect to the SMTP server, ensure that your application is configured to use the correct SSL/TLS settings.