Question

I want to get emails from all folders from gmail.
From inbox, sent and other folders I receive emails successfully.
But when I try to get it from Drafts, Spam and Trash I get an exception:

09:51:45,622 ERROR MailRetriever.[main]getNoFlaggedMails:142 - Can't get messages: javax.mail.MessagingException: connection failure
javax.mail.MessagingException: connection failure
at com.sun.mail.imap.IMAPStore.getProtocol(IMAPStore.java:742)
at com.sun.mail.imap.IMAPFolder.open(IMAPFolder.java:910)
at ua.com.stormlabs.gap.gmail.MailRetriever.getNoFlaggedMails(MailRetriever.java:133)
at ua.com.stormlabs.gap.gmail.GMailServiceProcessor.processFolder(GMailServiceProcessor.java:95)
at ua.com.stormlabs.gap.gmail.GMailServiceProcessor.start(GMailServiceProcessor.java:80)
at ua.com.stormlabs.gap.gmail.GMailGapApp.main(GMailGapApp.java:21)

This is code for retrieving mails:

Folder folder = imapSslStore.getFolder(folderName);
folder.open(Folder.READ_WRITE);
openedFolders.put(folderName, folder);

Flags searchFlags = new Flags(Flags.Flag.USER);
searchFlags.add(FLAG_PREFIX + READ_BY_GAP_FLAG);
Message[] messages = folder.search(new FlagTerm(searchFlags, false));
log.debug("Messages list retrieved: " + messages.length);
return messages;

Folder names I try to open unsuccessfully:

[Gmail]/Drafts
[Gmail]/Spam
[Gmail]/Trash

Answer 1

The simplest answer is that Draft, Spam and Trash are not folders but Labels in Google Mail. I am doing a Google search to validate my answer.

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Update: After some Google search, I have found a SO Post which states that the [Gmail]/* folders are non-selectable folders.