javax.mail.FolderClosedException: * BYE JavaMail Exception: javax.net.ssl.SSLException: Connection timed out (Read failed) for IMAP

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Please help me resolve this exception. I am running this IMAP email listener in my Spring Boot Java application to retrieve emails from my gmail inbox

 return IntegrationFlows
         .from(Mail.imapIdleAdapter(imapUrl())
                   .autoStartup(true)
                   .javaMailProperties(p -> p.put("mail.imap.ssl.trust", "*")
                                             .put("mail.imap.ssl.enable", "true"))
                   .shouldMarkMessagesAsRead(false)
                   .shouldDeleteMessages(false)
                   .shouldReconnectAutomatically(true)
                   .autoCloseFolder(false))
         .handle(m-> myService.process(MimeMessage))
         .get();

Occasionally I am getting the follow exception in a higher environment

 javax.mail.FolderClosedException: * BYE JavaMail Exception:
 javax.net.ssl.SSLException: Connection timed out (Read failed)
     at com.sun.mail.imap.IMAPFolder.handleIdle(IMAPFolder.java:3316)

leading to

2020-05-20 18:06:27.264  WARN 1 --- [ask-scheduler-1] o.s.i.mail.ImapIdleChannelAdapter        : Failed to execute IDLE task. Will attempt to resubmit in 10000 milliseconds.

I was wondering how you would recommend handling this issue? by poking the gmail server with a 'mail.timeout' property? Or is there another recommended method? Thanks again!

spring-integration jakarta-mail
1 Answers

See comment from Max. I agree: it is really normal that we get a connection loss. See that warn message:

Failed to execute IDLE task. Will attempt to resubmit in 10000 milliseconds.

And it does by logic:

this.receivingTask = scheduler.schedule(new ReceivingTask(), this.receivingTaskTrigger);

...

private class ReceivingTask implements Runnable {

    ReceivingTask() {
    }

    @Override
    public void run() {
        if (isRunning()) {
            try {
                ImapIdleChannelAdapter.this.idleTask.run();
                logger.debug("Task completed successfully. Re-scheduling it again right away.");
            }
            catch (Exception e) { //run again after a delay
                if (logger.isWarnEnabled()) {
                    logger.warn("Failed to execute IDLE task. Will attempt to resubmit in "
                            + ImapIdleChannelAdapter.this.reconnectDelay + " milliseconds.", e);
                }
                ImapIdleChannelAdapter.this.receivingTaskTrigger.delayNextExecution();
                publishException(e);
            }
        }
    }

}
user_27565470
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