Re: AW: IllegalStateException: Folder is not Open

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: [email protected]
>>[mailto:[email protected]]
>>Im Auftrag
>>von Jonathan Melhuish
>>Gesendet: Mittwoch, 28. Juli 2004 13:01
>>An: [email protected]
>>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
>>[email protected]
>>http://lists.gnu.org/mailman/listinfo/classpathx-javamail
>>
>>    
>>
>
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