按照我的理解，我编写了一个imap处理程序和一个事件监听器，但是我没有看到任何事件触发，尽管收件箱中充满了新的电子邮件。我有什么问题？
我将存储设置为空闲，直到有人关闭邮箱：

public void run() {
    boolean logged = false;
    synchronized (emailListener) {
        while (!isCancelled) {
            try {
                if (isListening) {
                    throw new EtlSystemException(
                            null,
                            "Disallowed attempt to "
                                + "start email listener - listening status already set",
                            null, null);
                } else {
                    isListening = true;
                }
                if (imapProperties == null) {
                    imapProperties = new Properties();
                    imapProperties.put("mail.debug", "true");
                }
                Session session =
                        javax.mail.Session.getInstance(imapProperties);
                session.setDebug(true);
                store = (IMAPStore) session.getStore(imapProtocol);
                store.connect(imapHost, imapUser, imapPassword);
                inbox = (IMAPFolder) store.getFolder("INBOX");
                if (inbox == null) {
                    throw new NonEtlSystemException(null, "No inbox in "
                        + this.imapUser,
                            null, null);
                }
                inbox.open(Folder.READ_WRITE);
                inbox.addMessageCountListener(emailListener);
                // While the listener is registered, we loop over idle().
                // Only stop if the inbox is closed, or thread interrupted
                while (inbox.isOpen()) {
                    log.debug("store idling...");
                    inbox.idle();
                }
                // if any system errors occur processing the emails, stop
                // the thread
                if (!emailListener.getStatusOK()) {
                    break;
                }
            } catch (MessagingException e) {
                lastThrowable = e;
            } catch (Throwable throwable) {
                lastThrowable = throwable;
                break;
            } finally {
                close();
                if (lastThrowable != null) {
                    if (!logged) {
                        EtlAlert alert = new EtlAlert(lastThrowable);
                        log.error(alert.getSysLogText(),
                                alert.getThrowable());
                        auditLogService.addEvent(alert.getEcnCode(),
                                alert.getEcnName(),
                                new Date(),
                                alert.getUserGpn(),
                                alert.getUserName(),
                                alert.getEventType(),
                                alert.getAuditLogText());
                        logged = true;
                    }
                    if (lastThrowable instanceof MessagingException) {
                        try {
                            log.info("Waiting for IMAP server recovery ... "
                                + "checks every " + WAIT_AT_IMAP_ERROR
                                + "ms ");
                            Thread.sleep(WAIT_AT_IMAP_ERROR);
                        } catch (InterruptedException e1) {
                        }
                    }
                }
            }
        }
    }
    log.debug("thread dying now");
}

我就是这样测试的：

@Test
public void testImapHandler() {
    try {
        // launch ImapHandler
        ImapHandler imapHandler =
                new ImapHandler(new EmailListener());
        imapHandler.setConfig(host, protocol, imapUser, imapPass);
        // now the listener starts listening in a separate thread
        Thread test = new Thread(imapHandler, "ImapHandler");
        test.start();
        // send a test email to inbox
        int startCount = imapHandler.getProcessedMessageCount();
        sendTestEmail();
        // wait for a bit
        Thread.sleep(60000);
        // stop it
        log.debug("stopping listener on thread [" + test.getName() + "]");
        test.interrupt();
        imapHandler.closeAndTerminate(); // this forces it out of idling
        test.join();
        // test listener count to see if it raised an email event
        int finalCount = imapHandler.getProcessedMessageCount();
        assertNotSame("start with " + startCount + ", ended with "
            + finalCount, startCount, finalCount);
    } catch (final InterruptedException e) {
    }
}

这个 imapHandler.closeAndTerminate() 方法关闭收件箱和存储，这将强制 store.idle() 停止阻塞。imaphandler类用作单例，而store和inbox作为memvars保存，仅此而已。
这是imap会话的调试日志：

DEBUG: JavaMail version 1.5.0-b01
DEBUG: successfully loaded resource: /META-INF/javamail.default.providers
DEBUG: Tables of loaded providers
DEBUG: Providers Listed By Class Name: {com.sun.mail.smtp.SMTPSSLTransport=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle], com.sun.mail.imap.IMAPSSLStore=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], com.sun.mail.pop3.POP3SSLStore=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle]}
DEBUG: Providers Listed By Protocol: {imaps=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], smtps=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle], pop3s=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]}
DEBUG: successfully loaded resource: /META-INF/javamail.default.address.map
DEBUG: setDebug: JavaMail version 1.5.0-b01
DEBUG: getProvider() returning javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle]
DEBUG IMAPS: mail.imap.fetchsize: 16384
DEBUG IMAPS: mail.imap.ignorebodystructuresize: false
DEBUG IMAPS: mail.imap.statuscachetimeout: 1000
DEBUG IMAPS: mail.imap.appendbuffersize: -1
DEBUG IMAPS: mail.imap.minidletime: 10
DEBUG IMAPS: disable AUTH=PLAIN
DEBUG IMAPS: disable AUTH=NTLM
DEBUG IMAPS: trying to connect to host "webmail", port 993, isSSL true

* OK The Microsoft Exchange IMAP4 service is ready.

A0 CAPABILITY

* CAPABILITY IMAP4 IMAP4rev1 AUTH=NTLM AUTH=GSSAPI AUTH=PLAIN UIDPLUS CHILDREN IDLE NAMESPACE LITERAL+

A0 OK CAPABILITY completed.
DEBUG IMAPS: AUTH: NTLM
DEBUG IMAPS: AUTH: GSSAPI
DEBUG IMAPS: AUTH: PLAIN
DEBUG IMAPS: protocolConnect login, host=webmail, user=826, password=<non-null>
DEBUG IMAPS: LOGIN command trace suppressed
DEBUG IMAPS: LOGIN command result: A1 OK LOGIN completed.
A2 CAPABILITY

* CAPABILITY IMAP4 IMAP4rev1 AUTH=NTLM AUTH=GSSAPI AUTH=PLAIN UIDPLUS CHILDREN IDLE NAMESPACE LITERAL+

A2 OK CAPABILITY completed.
DEBUG IMAPS: AUTH: NTLM
DEBUG IMAPS: AUTH: GSSAPI
DEBUG IMAPS: AUTH: PLAIN
DEBUG IMAPS: connection available -- size: 1
A3 SELECT INBOX

* 42 EXISTS
* 2 RECENT
* FLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)
* OK [PERMANENTFLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)] Permanent flags
* OK [UNSEEN 3] Is the first unseen message
* OK [UIDVALIDITY 71441] UIDVALIDITY value
* OK [UIDNEXT 46] The next unique identifier value

A3 OK [READ-WRITE] SELECT completed.
17:54:34.132 [ImapHandler] DEBUG (ImapHandler.java:205) runListener() - store idling...
A4 IDLE
+ IDLE accepted, awaiting DONE command.

* 35 FETCH (FLAGS (\Seen))

17:55:33.320 [main] DEBUG (ImapTest.java:96) testImapHandler() - stopping listener on thread [ImapHandler]
DONE
A4 OK IDLE completed.
DEBUG IMAPS: IMAPProtocol noop
A5 NOOP
A5 OK NOOP completed.
A6 CLOSE
A6 OK CLOSE completed.
DEBUG IMAPS: added an Authenticated connection -- size: 1
DEBUG IMAPS: IMAPProtocol noop
A7 NOOP
A7 OK NOOP completed.
A8 LOGOUT

* BYE Microsoft Exchange Server 2010 IMAP4 server signing off.

A8 OK LOGOUT completed.
DEBUG IMAPS: IMAPStore connection dead
DEBUG IMAPS: IMAPStore cleanup, force false
DEBUG IMAPS: IMAPStore cleanup done
17:55:33.342 [ImapHandler] DEBUG (ImapHandler.java:188) run() - thread dying now

您可以从imap日志记录之间的log4j log语句中看到 Store.idle() 命令运行了整整一分钟，在此期间测试线程发送了测试电子邮件。
我能想到的任何其他相关信息：
交易所2010
汤姆猫7
javamail 1.5.0-b01
jdk 1.7.0-55标准