javamail api to access gmail inbox messages

Question

I have been trying to use the javamail api to read gmail inbox messages. I found the following code on the internet. I'm trying to run this on Eclipse, but it is failing with an "Invalid credentials exception". I have mail.jar, activation.jar, imap.jar and other jar files in the lib directory of the web-app.

Any ideas as to why I am receiving this exception ? Thanks.

javax.mail.AuthenticationFailedException: Invalid credentials n67if632335wep.219
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:665)
at javax.mail.Service.connect(Service.java:295)
at javax.mail.Service.connect(Service.java:176)
at org.mb.mail.MailReader.main(MailReader.java:23)


package org.mb.mail;

import java.util.Properties;

import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.NoSuchProviderException;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.*;

public class MailReader {

public static void main(String args[]) {
Properties props = System.getProperties();
props.setProperty("mail.store.protocol", "imaps");
try {
Session session = Session.getDefaultInstance(props, null);
Store store = session.getStore("imaps");
store.connect("imap.gmail.com", "<username>", "password");
System.out.println(store);

Folder inbox = store.getFolder("Inbox");
inbox.open(Folder.READ_ONLY);
Message messages[] = inbox.getMessages();
for(Message message:messages) {
System.out.println(message);

}

        } catch (NoSuchProviderException e) {
            e.printStackTrace();
            System.exit(1);
        } catch (MessagingException e) {
            e.printStackTrace();
            System.exit(2);
        }

    }

}

Answer 1

Throw away that code and use this code from the JavaMail FAQ, where you'll also find lots of other helpful tips, including debugging tips.