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From Dola Woolfe <dolac...@yahoo.com>
Subject RE: Suppress "Connection reset by peer: socket write error".
Date Fri, 14 Oct 2005 06:42:37 GMT
Hi Robert,

What a truly fantastic answer! Very detailed and
educational. Your timeis deeply appreciated.

What I'd like to know is: do I have to do it in every
JSP (I have hundreds). And is there a configuration
solution as was alluded by Bill previously?

Once again, very many thanks!!!

Dola

--- Robert Graf-Waczenski <rgw@lsoft.com> wrote:

> 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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