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From "Robert Graf-Waczenski" <...@lsoft.com>
Subject RE: Suppress "Connection reset by peer: socket write error".
Date Fri, 14 Oct 2005 06:32:52 GMT
Hi!

First, some background:

The exception your app actually gets internally is a
SocketException with the text you mention below.
It occurs if the client browser prematurely cancels
an http request before tomcat has completed sending
the full response data to the client.
Another manifestation may be a SocketException with
the text "Socket closed", which *may* occur if your
app serves big download data streams and the client
cancels the download.

The bottom line is that these two exceptions simply
happen in real life web apps and that they can be
"safely ignored".

However, you correctly want to know how your app can
perform the magic to "safely ignore" these two
exceptions outomatically, right?

So you will need to add some error handling that would
basically consist of wrapping everyting in your app
inside a try/catch block that would swallow the
two variants of SocketException above. But the problem
with this approach is that you must not simply swallow
*all* SocketExceptions.

Here's what we do in our app:

catch(SocketException e) {
  String stackTrace  = Util.getStackTrace(e); // this extracts the full
stack trace
  if ((stackTrace.indexOf("socket write error") > -1
       || stackTrace.indexOf("Socket closed") > -1)
     &&

(stackTrace.indexOf("org.apache.tomcat.service.http.HttpResponseAdapter"
) > -1
       || stackTrace.indexOf("javax.servlet.http.HttpServlet.service(")
> -1))
  {
	log("Client signalled end of socket communication");
  }
  else
    throw e;
}

(Note that you may have to re-construct the full lines
of the source code above as my mail client may have
introduced linebreaks at bad places...)

Yes, we log an error message even if this particular "client
aborted request" situation was detected. You may want to swallow
this silently, but i would suggest to not do this because you
(and we) never are sure if the stack trace analysis above is
perfect. The other down side of this approach is that future
versions of Java and/or Tomcat may change the exception message
texts and/or the structure of the stack trace. But currently
(JDK 1.5 / Tomcat 5.5) this approach does what was intended.

Robert

> -----Original Message-----
> From: Dola Woolfe [mailto:dolachin@yahoo.com]
> Sent: Friday, October 14, 2005 3:17 AM
> To: Tomcat Users List
> Subject: Re: Suppress "Connection reset by peer: socket write error".
>
>
> Hi Bill,
>
> Thanks for your answer and sorry for the delay in my
> reply!
>
> I'm using standalong Tomcat 5.5 listening on port 80.
> I'm using jdk 1.5 on WinXP. I'm not using any special
> logging. I'm running Tomcat in a console, simply by
> typing "startup" in tomcat/bin.
>
> What I don't want happening is for the "Connection
> reset by peer: socket write error" to be displayed in
> the console window.
>
> Given this detailed information, would you mind
> refining your recommendation?
>
> Thank you very much in advance,
>
> Dola Chin
>
>
>
> --- Bill Barker <wbarker@wilshire.com> wrote:
>
> >
> > "Dola Woolfe" <dolachin@yahoo.com> wrote in message
> >
> news:20050916174326.66449.qmail@web51808.mail.yahoo.com...
> > > Hi,
> > >
> > > I apologize for asking this question again for I
> > > remembering asking this question in the past, but
> > I
> > > can't find the response.
> > >
> > > What setting (and where) will suppress the
> > > aforementioned exception in the tomcat log?
> > >
> >
> > Including the Tomcat version helps ;-).
> >
> > I'm assuming that this is for the AJP/1.3 Connector.
> >  The answer is to
> > change the logging level for that component to be
> > one higher than the level
> > in the message (in the latest version, it's at DEBUG
> > level and I don't
> > remember what it used to be).  For example, if you
> > are using JDK1.4 logging
> > you would do something like:
> >   org.apache.jk.common.level=SEVERE
> >
> > in your logging.properties file.
> >
> > > Thank you very much in advance, again!
> > >
> > > Dola
> > >
> > >
> > >
> > > __________________________________
> > > Yahoo! Mail - PC Magazine Editors' Choice 2005
> > > http://mail.yahoo.com
> >
> >
> >
> >
> >
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> >
>
>
>
>
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