AW: [Classpathx-javamail] IllegalStateException: Folder is not Open

[Stephan Mikaty]

The MimeMessage you retrieved from the POP3 folder is
just a proxy to the physical one located on the pop3 server.
Storing it requires that it be fetched first. If the delay
between acquiring the pop3 MimeMessage instance and reading
its data from the server is too long, the pop3 connection
might get closed. To avoid this, you need to physically fetch
the whole message shortly after acquiring the MimeMessage
instance from the pop3 provider.

My favorite way of doing this is to use the MimeMessage's copy
constructor to build a new, standalone message.

After doing this, you cand pass the message copy to storeMessage:

MimeMessage pop3Message = (message you retrived from pop3);
MimeMessage messageCopy = new MimeMessage(pop3Message);
...storeMessage(messageCopy);

Beware though, the whole message data resides in memory, so
big messages could be a problem.

Hope that helps,

Stephane

> -----Ursprüngliche Nachricht-----
> Von: address@hidden
> [mailto:address@hidden
> Im Auftrag
> von Jonathan Melhuish
> Gesendet: Mittwoch, 28. Juli 2004 13:01
> An: address@hidden
> Betreff: [Classpathx-javamail] IllegalStateException: Folder 
> is not Open
> 
> 
> Hi,
> 
> I'm trying to write a simple program that downloads messages 
> from a POP3
> server and writes them to disk.  I've successfully used the Sun
> libraries to download the messages, but I need to use the GNU Javamail
> implementation to save the messages to an Mbox file.  I couldn't find
> much in the way of usage instructions or code examples (which is a
> shame), but through a bit of guesswork I came up with this:
> 
> public void storeMessage(MimeMessage message) {
>             URLName mbox = new 
> URLName("mbox:///home/jon/epmail/test");
>             Store store = session.getStore(mbox);
>             Folder root = store.getDefaultFolder();
>             if(!root.exists()) root.create(Folder.HOLDS_MESSAGES);
>             root.open(Folder.READ_WRITE);
> 
>             // Add message to store
>             MimeMessage[] messagearray = new MimeMessage[1];
>             messagearray[0] = message;
>             root.appendMessages(messagearray);
>             root.releaseLock();
> }
> 
> When running this code, I get:
> 
> Exception in thread "main" java.lang.IllegalStateException: Folder is
> not Open
>     at com.sun.mail.pop3.POP3Folder.checkOpen(POP3Folder.java:414)
>     at com.sun.mail.pop3.POP3Folder.getProtocol(POP3Folder.java:441)
>     at com.sun.mail.pop3.POP3Message.getSize(POP3Message.java:92)
>     at javax.mail.internet.MimeMessage.<init>(MimeMessage.java:189)
>     at 
> gnu.mail.providers.ReadOnlyMessage.<init>(ReadOnlyMessage.java:73)
>     at gnu.mail.providers.mbox.MboxMessage.<init>(MboxMessage.java:83)
>     at 
> gnu.mail.providers.mbox.MboxFolder.appendMessages(MboxFolder.java:558)
>     at 
> com.qinetiq.dtg.email.MailClient.storeMessage(MailClient.java:150)
>     at com.qinetiq.dtg.email.MainTimer.main(MainTimer.java:59)
> 
> Even though Folder.exists() returns true, Folder.isOpen() also returns
> true and an empty file is created in the desired location.
> 
> The mentions of POP3Folder in the above error concerns me 
> somewhat, but
> I'm not sure where that's coming from as the argument should now be a
> MimeMessage.  I tried casting the MimeMessage to an 
> MboxMessage just for
> good measure, but got a ClassCastException.
> 
> If I comment out the Folder.create() line and delete the output file, 
> Folder.exists() still returns true, but 
> Folder.open(Folder.READ_WRITE) 
> gives a "MessagingException: Folder is read-only".  I'm not 
> sure if this 
> is relevant, but I can't find any meaningful documentation for 
> Folder.create.
> 
> Anybody got any ideas?
> 
> Cheers,
> 
> Jon
> 
> 
> 
> 
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