folder.Expunge() not supported exception.

[vikas tarade]

I want to delete some messages in my mailbox.
When a message is read the DELETED flag was set as,
message.setFlag(Flags.Flag.DELETED,true);
folder.Expunge();
As per the documentation,folder.Expunge() method will look for all the messages in the folder whose DELETED flag is set.
But with the above code Exception was thrown as
method folder.Expunge() not supported by the implementation.
How should I delete the messages I want,or get through this problem?
Thanks
Vikas

[Lewin Chan]

Assuming you are using the Sun POP3 implementation, and you read the sundocs, you will find that Folder.expunge is not supported...
You should do Message.setFlag(Flags.Flag.DELETED), and then do a folder.close(true) to delete the messages

[William Brogden]

I just tried this:
msg[i].setFlag( Flags.Flag.DELETED ,true );// could mark flag?
msg[i].saveChanges(); // will delete when folder closed
and got the following :
javax.mail.IllegalWriteException: POP3 messages are read-only
at com.sun.mail.pop3.POP3Message.saveChanges(POP3Message.java:380)
at com.lanw.clients.TestMailRead.main(TestMailRead.java:48)
The folder was opened like this:
folder.open(Folder.READ_WRITE);
So - now I am mystified, how can I delete a Message from a Folder?
Bill

[William Brogden]

Aha - get to answer my own question.
if I remove the line: msg[i].saveChanges();
But use the following on the folder:
folder.close(true) ;
Then the POP3 messages are deleted.
Somehow that does not seem "instinctive"!
Bill