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From "Hunter, Sandra" <Sandra_Hun...@BCTransit.Com>
Subject RE: Tomcat Freezing?
Date Thu, 15 May 2003 22:28:46 GMT
Well it has stopped. I think I did have a code error: I was calling the
wrong statement for a resultset, so calling it twice. I have made such an
error before without causing such a crisis but I guess Tomcat had just had
enough of my foolishness. 
It is so frustrating to not know why something is happening and I thought I
had done everything right but after doing it twice it got sorted out.
Thanks all!
Sandra

-----Original Message-----
From: Jason Bainbridge [mailto:jason@jblinux.org] 
Sent: Thursday, May 15, 2003 2:41 PM
To: Tomcat Users List
Subject: Re: Tomcat Freezing?

I assume you are using the Oracle JDBC Thin drivers then? Just want to make 
sure you aren't doing anything like using the JDBC-ODBC bridge but I doubt
it 
just clutching at straws...

Do the log files shine any info on the problem? (not your log messages but
the 
Tomcat logs)?

J.

On Fri, 16 May 2003 05:28 am, Hunter, Sandra wrote:
> The queries all run in Oracle.
> Other pages with SQL queries all run fine.
> The privileges all allow for the SQL stuff I am doing which is very basic.
> I am going through the commenting process again and lines that ran fine
> half an hour ago with no changes made now seem to be stalling.
> Even when I close the app, Tomcat is still hung and I can't close it from
> the command line.
> I close all my resultsets and statements and connections.
> I could include all my code but there are thousands of lines and there
> seems to be no consistent line or lines that are causing the problem.
>
> -----Original Message-----
> From: George Sexton [mailto:gsexton@mhsoftware.com]
> Sent: Thursday, May 15, 2003 2:10 PM
> To: Tomcat Users List
> Subject: RE: Tomcat Freezing?
>
> Have you looked at your database and made sure that you don't have
blocking
> issues keeping your queries from running?
>
> -----Original Message-----
> From: Hunter, Sandra [mailto:Sandra_Hunter@BCTransit.Com]
> Sent: Thursday, May 15, 2003 3:06 PM
> To: 'Tomcat Users List'
> Subject: RE: Tomcat Freezing?
>
>
> This freezing problem seems to be really intermittent. I am really
stumped.
> I have put in printlines every other line and commented out just about
> everything and then gradually added stuff and it will freeze at pretty
> (apparently) random places. It stopped doing it with one page (for no
> apparent reason) and now has started doing it with another. But it doesn't
> happen consistently.
> No applets, etc. Nothing fancy at all just straight ahead java and sql.
> I surely am confused.
>
> -----Original Message-----
> From: Bill Barker [mailto:wbarker@wilshire.com]
> Sent: Wednesday, May 14, 2003 10:40 PM
> To: tomcat-user@jakarta.apache.org
> Subject: Re: Tomcat Freezing?
>
> I second Matt's suggestions.  If you are really stumped as to the problem,
> try inserting logging statements every few lines in your JSP (if you are
> not using a real logging package, such as log4j, Tomcat's default JSPPage
> class extends GenericServlet, so you can simply do something like <%
> log("Getting DB info"); %>).
>
> "Matt Wiseley" <matt@wiseley.com> wrote in message
> news:E19G5gS-0007S9-7C@odie.runbox.com...
> Sandra,
>
> If it's only happening with one JSP, and it happens every time it's
> requested, it's almost certainly a coding problem. Without looking at the
> source code, it's pretty hard to say what's causing it. From my own
> experience, I have seen only two coding errors that "hang" Tomcat. The
> first is opening database connections from a pool and not closing them.
The
> second is a page that forwards to itself somehow. Also look for code that
> creates an endless loop of some kind, although these usually either run
out
> of memory, cause an overflow, or time out.
>
> Matt
>
> > Being new and inexperienced as I am I don't know how to problem solve
> > this issue.
> >
> > I have a jsp app that I am running in Tomcat 4.0 with Apache 2 HTTP
>
> server
>
> > on a Win2k pro box.
> >
> > My apologies to those who receive this twice. Some weirdness with my
>
> address
>
> > book.
> >
> > All has been well until now. I have one page that is freezing: it
doesn't
> > complete loading after several minutes. When I try to shut down Tomcat
it
> > also doesn't do anything. It displays this message in the command line:
> > "Stopping service Tomcat-Standalone" but after several minutes the
window
>
> is
>
> > still open and the task manager tells me Tomcat is still running. I have
> > tried stopping tomcat,deleting all the files in the work folder and
> > restarting Tomcat.
> >
> > I know it must be something to do with the page, but I don't know where
> > to begin to look or what to look for.
> >
> > Any ideas?
> >
> >
> >
> > Sandra Patricia Hunter
> >
> >
> > ---------------------------------------------------------------------
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-- 
Jason Bainbridge
KDE Web Team - http://kde.org 
webmaster@kde.org 

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