Question

I developed a webmail to link apache james and it works. But some user cannot receive emails from james. I set mailSession.setDebug(true) and trace two users’ logs(sa can receive, the other cannot). The difference shows below:

the user who can receive email successfully(user sa):

[2012-11-15 14:24:12] com.csc.mail.jsh.mail.core.ReceiveMail : [INFO ]  - trying to receive emails from james server...
C: STAT
S: +OK 2 2584
C: NOOP
S: +OK
C: TOP 1 0
S: +OK Message follows
...

the other user receive failure(user chai):

[2012-11-15 14:22:01] com.csc.mail.jsh.mail.core.ReceiveMail : [INFO ]  - trying to receive emails from james server...
C: STAT
S: -ERR
C: QUIT
S: +OK Apache James POP3 Server signing off.
[2012-11-15 14:22:03] com.csc.mail.jsh.mail.core.ReceiveMail : [ERROR]  - Folder open failed：javax.mail.MessagingException: Open failed;
nested exception is:
    java.io.IOException: STAT command failed: null
    at com.sun.mail.pop3.POP3Folder.open(POP3Folder.java:228)
    at com.csc.mail.jsh.mail.core.ReceiveMail.receive(ReceiveMail.java:82)
    at com.csc.mail.jsh.mail.core.ReceiveMail.run(ReceiveMail.java:222)
    at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.IOException: STAT command failed: null
    at com.sun.mail.pop3.Protocol.stat(Protocol.java:366)
    at com.sun.mail.pop3.POP3Folder.open(POP3Folder.java:203)
    ... 3 more

My receive code:

Session mailSession = Session.getInstance(System.getProperties(), null);
mailSession.setDebug(true);
Store store = null;
Folder folder = null; //javax.mail.Folder
try {
    store = mailSession.getStore("pop3");
    store.connect(Property.getPop3(), userName, password);
    logger.info("trying to receive emails from james server...");
    folder = store.getFolder("INBOX");
    try {
        if (!folder.isOpen()) {
            folder.open(Folder.READ_WRITE); //the point of throwing the exception
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    //receive email from james server.
} catch (Exception e) {
    logger.error("Email Receive Error!" + StackTraceStr.st2str(e));
    try {
        folder.close(true);
    } catch (Exception e2) {
    }
} finally {
    try {
        store.close();
    } catch (Exception cloex) {
    }
}

I had posted a post at here. Thanks for your any help!

Answer 1

I had contact with Apache James and finally found the answer. You can find it at here: STAT command failed occasionally. At the end of the page, the thread had been listed.