How to close javax.mail.session example

In JavaMail, a Session object is used to manage the connection to a mail server. When you're done using the session, it's a good practice to close it to free up system resources.

Here's an example of how to close a Session object:

import javax.mail.*;
import javax.mail.Session;

// Create a Session object
Session session = Session.getInstance(props, new Authenticator() {
    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication("username", "password");
    }
});

// Use the session to send/receive emails...

// Close the session
session.close();

In this example, we create a Session object using the Session.getInstance() method, passing in a Properties object and an Authenticator object. We then use the session to send or receive emails.

When we're done using the session, we call the close() method to close it. This will release any system resources associated with the session, such as the connection to the mail server.

Note that if you're using a Session object in a multi-threaded environment, you should close the session in a finally block to ensure that it's closed even if an exception is thrown:

try {
    // Use the session to send/receive emails...
} finally {
    session.close();
}

Alternatively, you can use a try-with-resources statement to ensure that the session is closed:

try (Session session = Session.getInstance(props, new Authenticator() {
    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication("username", "password");
    }
})) {
    // Use the session to send/receive emails...
}

This will automatically close the session when the try block is exited, regardless of whether an exception is thrown or not.