public class MailClient {
    private String host;
    private String username;
    private String password;
    private String provider;
    protected Session session;

    public MailClient() {
        Properties props = new Properties();

        this.host = "localhost";
        this.username = "unix-user";
        this.password = "unix-password";
        this.provider = "pop3";

        this.session = Session.getDefaultInstance(props, null);
    }

    public void checkInbox() throws MessagingException, IOException {
        Store store = session.getStore(provider);
        store.connect(host, username, password); //This is line 33
        Folder inbox = store.getFolder("inbox");
        inbox.open(Folder.READ_ONLY);
        Message[] messages = inbox.getMessages();

        for(Message message : messages){
            System.out.println(message.getReceivedDate());
            System.out.println(message.getSubject());
        }

        inbox.close(true);
        store.close();
    }
}