Re: Hang in WOMailDelivery.sendEmail
Re: Hang in WOMailDelivery.sendEmail
- Subject: Re: Hang in WOMailDelivery.sendEmail
- From: Chuck Hill <email@hidden>
- Date: Wed, 21 Sep 2005 10:59:55 -0700
The first thing I would do is to use java.util.Timer and a separate
thread. That way, at least the app won't hang if the mail thread
stalls out waiting for a server response.
Chuck
On Sep 21, 2005, at 10:54 AM, Allen Cronce wrote:
Hi all,
We're trying to debug a hang that happens sporadically when sending
e-mails. Currently we send e-mails using WOMailDelivery.sendEmail
from a
WOTimer in our application instance. This centralizes all e-mail sends
for the application. In the future we'd like to use Project Wonder
ERJavaMail framework, but we can't do that short term.
The really weird thing is that the stack trace indicates that the
underlying socket code is waiting forever for data back from the e-
mail
server. I would have expected instead to see some sort of threading
deadlock, but that doesn't seem to be the case. We control both the
e-mail server and the application server but we can see no obvious
problem in any of our logs.
Here's the stack trace (note that I've edited out most of the worker
threads since they're all the same):
--snip--
WorkerThread0:
[1] java.net.PlainSocketImpl.accept (PlainSocketImpl.java:351)
[2] java.net.ServerSocket.implAccept (ServerSocket.java:448)
[3] java.net.ServerSocket.accept (ServerSocket.java:419)
[4] com.webobjects.appserver._private.WOWorkerThread.run
(WOWorkerThread.java:238)
[5] java.lang.Thread.run (Thread.java:552)
Thread-0:
[1] java.lang.Thread.sleep (native method)
[2] com.webobjects.appserver.WOApplication$_LifebeatThread.run
(WOApplication.java:1,233)
Session Timeout Thread:
Current thread isn't suspended.
Signal Dispatcher:
Finalizer:
[1] java.lang.Object.wait (native method)
[2] java.lang.ref.ReferenceQueue.remove (ReferenceQueue.java:111)
[3] java.lang.ref.ReferenceQueue.remove (ReferenceQueue.java:127)
[4] java.lang.ref.Finalizer$FinalizerThread.run (Finalizer.java:159)
Reference Handler:
[1] java.lang.Object.wait (native method)
[2] java.lang.Object.wait (Object.java:429)
[3] java.lang.ref.Reference$ReferenceHandler.run (Reference.java:
115)
main:
[1] java.net.SocketInputStream.socketRead0 (native method)
[2] java.net.SocketInputStream.read (SocketInputStream.java:129)
[3] java.io.BufferedInputStream.fill (BufferedInputStream.java:183)
[4] java.io.BufferedInputStream.read (BufferedInputStream.java:201)
[5] sun.net.TransferProtocolClient.readServerResponse
(TransferProtocolClient.java:49)
[6] sun.net.smtp.SmtpClient.issueCommand (SmtpClient.java:46)
[7] sun.net.smtp.SmtpClient.openServer (SmtpClient.java:112)
[8] sun.net.smtp.SmtpClient.<init> (SmtpClient.java:135)
[9] com.webobjects.appserver.WOMailDelivery.sendEmail
(WOMailDelivery.java:201)
[10] com.paceap.ilok.Application.timer (Application.java:832)
[11] sun.reflect.GeneratedMethodAccessor12.invoke (null)
[12] sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
[13] java.lang.reflect.Method.invoke (Method.java:324)
[14] com.webobjects.foundation.NSSelector.invoke (NSSelector.java:
354)
[15] com.webobjects.foundation.NSSelector.invoke (NSSelector.java:
381)
[16] com.webobjects.appserver.WOTimer.fire (WOTimer.java:190)
[17] com.webobjects.appserver._WORunLoop._nextTimerInterval
(_WORunLoop.java:179)
[18] com.webobjects.appserver._WORunLoop._limitDate
(_WORunLoop.java:84)
[19] com.webobjects.appserver._WORunLoop.runBeforeDate
(_WORunLoop.java:63)
[20] com.webobjects.appserver.WOApplication._runOnce
(WOApplication.java:775)
[21] com.webobjects.appserver.WOApplication.run
(WOApplication.java:900)
[22] com.webobjects.appserver.WOApplication.main
(WOApplication.java:324)
[23] com.paceap.ilok.Application.main (Application.java:106)
[24] sun.reflect.NativeMethodAccessorImpl.invoke0 (native method)
[25] sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:39)
[26] sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
[27] java.lang.reflect.Method.invoke (Method.java:324)
[28] com.webobjects._bootstrap.WOBootstrap.main (WOBootstrap.java:
71)
--snip--
Any ideas as to how to resolve this would be much appreciated.
Best regards,
--
Allen Cronce
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