javax.mail.MessagingException: null; nested exception is:
    java.io.IOException
    at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:298)
    at javax.mail.Service.connect(Service.java:234)
    at javax.mail.Service.connect(Service.java:135)
    at com.emdi.sl3.server.emailConnector.EmailListenerAcknowledge.run(Email ListenerAcknowledge.java:92)
    at java.lang.Thread.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)`

import java.util.*;
import javax.mail.*;
import javax.mail.event.*;

import com.sun.mail.imap.*;

public class EmailListenerAcknowledge implements Runnable {

    private Store store;
    private Folder folder;
    String host;
    String user;
    String password;

    public void run() {

        try {
            // TODO: Set email protocol, username and password.
            host = "imap.gmail.com";
            user = "fdsfds";
            password = "sdfsff";

            String mbox = "inbox";

            String frequency = "1";

            System.out.println("nTesting monitorn");

            Properties props = new Properties();
            props.setProperty("mail.imap.ssl.enable", "true");
            props.setProperty("mail.imap.port", "993");

            // Get a Session object
            Session session = Session.getInstance(props);

            // Get a Store object
            store = session.getStore("imap");

            // Connect
            store.connect(host, user, password);
            System.out.println("Connected!!!");

            // Open a Folder
            folder = store.getFolder(mbox);
            if (folder == null || !folder.exists()) {
                System.out.println("Invalid folder");
                System.exit(1);
            }

            folder.open(Folder.READ_ONLY);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

javax.mail.MessagingException: Connection timed out: connect; nested exception is:java.net.ConnectException: Connection timed out: connect
    at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:298)
    at javax.mail.Service.connect(Service.java:234)
    at javax.mail.Service.connect(Service.java:135)
    at com.emdi.sl3.server.emailConnector.EmailListener.run(Email ListenerAcknowledge.java:92)
    at java.lang.Thread.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)`