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

[Jonathan Melhuish]

Yay!  That fixed it... :-)

The only thing I had forgotten was Folder.close(), without which no data 
is actually written disk.

Now I just have to work out why POP3Message.getSender() equates to null...

Thanks,

Jon

Stephan Mikaty wrote:

> 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
> >
> >
> >
> >
> > _______________________________________________
> > Classpathx-javamail mailing list
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/classpathx-javamail
> >
> >    
>
>
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