Accessing emails from gmail using IMAP ( javamail API)

Is one of the accounts using non-english UI by any chance?

Gmail folder names are localized with respect to the user localization settings.

Currently the only way to get the name of the localized folder is by using XLIST command.

package com.technicalkeeda;

import java.io.File;
import java.io.FileInputStream;
import java.util.Properties;

import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Store;

public class GmailInbox {

 public static void main(String[] args) {
  GmailInbox gmail = new GmailInbox();
  gmail.read();
 }

 public void read() {
  Properties props = new Properties();
  try {
   props.load(new FileInputStream(new File("C:\\smtp.properties")));
   Session session = Session.getDefaultInstance(props, null);

   Store store = session.getStore("imaps");
   store.connect("smtp.gmail.com", "*************@gmail.com","your_password");

   Folder inbox = store.getFolder("inbox");
   inbox.open(Folder.READ_ONLY);
   int messageCount = inbox.getMessageCount();

   System.out.println("Total Messages:- " + messageCount);

   Message[] messages = inbox.getMessages();
   System.out.println("------------------------------");
   for (int i = 0; i < 10; i++) {
      System.out.println("Mail Subject:- " + messages[i].getSubject());      
   }
   inbox.close(true);
   store.close();

  } catch (Exception e) {
   e.printStackTrace();
  }
 }

}

You can try the following code:

private List<String> getResult1(){
  try {
    Properties props = new Properties();
    props.put("mail.store.protocol","imaps");
    Session session = Session.getDefaultInstance(props, null);
    Store store = session.getStore("imaps");
    store.connect("imap.gmail.com", "Email Id", "App Password");

    //if you want mail from specified folder, just change change folder name
    //Folder inbox = store.getFolder("[Gmail]/Drafts");
    Folder inbox = store.getFolder("inbox");

    inbox.open(Folder.READ_ONLY);
    int messageCount = inbox.getMessageCount();
    Log.e("getFolder ", "getResult1: " + store.getDefaultFolder().list("*"));
    javax.mail.Folder[] folders = store.getDefaultFolder().list("*");

    for (javax.mail.Folder folder : folders) {
      if ((folder.getType() & javax.mail.Folder.HOLDS_MESSAGES) != 0){
        Log.e("getFolder ", "getResult1: " + folder.getName() );
      }
    }

    Log.e("Mail Subject:", "Total Messages:-: " + messageCount );
    javax.mail.Message[] messages = inbox.getMessages();

    System.out.println("------------------------------");
    Log.e("Mail Subject:", "messages: " + messages.toString());
    for (int i = 0; i < messages.length; i++) {
      Log.e("Mail Subject:", "getResult1: " + messages[i].getSubject());
    }
    inbox.close(true);
    store.close();
  } catch (Exception e) {
    e.printStackTrace();
  }
  return null;
}

Im unsure if this helps, but I've seen instances where gmail accounts have different mailboxes ie..

Gmail Account 1 :-

[[Google Mail]]
[[Google Mail]/All Mail]
[[Google Mail]/Bin]
[[Google Mail]/Drafts]
[[Google Mail]/Important]
[[Google Mail]/Sent Mail]
[[Google Mail]/Spam]
[[Google Mail]/Starred]

Gmail Account 2 :-

[[Gmail]]
[[Gmail]/All Mail]
[[Gmail]/Bin]
[[Gmail]/Drafts]
[[Gmail]/Important]
[[Gmail]/Sent Mail]
[[Gmail]/Spam]
[[Gmail]/Starred]