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From "Koes, Derrick" <Derrick.K...@smith-nephew.com>
Subject RE: Tomcat STILL freezing - time to look at another app server?
Date Wed, 28 May 2003 19:44:07 GMT

I don't know if this helps any, but this has benefited me.

If using an oracle database, try oracle.jdbc.pool.OracleOCIConnectionPool to
get connection pool stats.



-----Original Message-----
From: Carl [mailto:carl@etrak-plus.com] 
Sent: Wednesday, May 28, 2003 2:48 PM
To: Tomcat Users List
Subject: Re: Tomcat STILL freezing - time to look at another app server?

I have had a problem that sounds very similar many times (I don't learn very
fast.)  In all my cases, the problem was running the connection pool out of
connections because I wasn't freeing the connections in c couple of places.
The fact that it occurs when trying to insert something into the data base
indicates that it is related to that activity.

----- Original Message -----
From: "Hunter, Sandra" <Sandra_Hunter@BCTransit.Com>
To: "'Tomcat Users List'" <tomcat-user@jakarta.apache.org>
Sent: Wednesday, May 28, 2003 1:48 PM
Subject: RE: Tomcat STILL freezing - time to look at another app server?


> I am not able to reproduce the problem reliably: that's what is making me
> crazy.
> It happens when things are being inserted to the database but never on the
> same page, never everytime, doesn't matter what else I am doing or what
else
> has been done. No one else is accessing this database right now so I am
the
> only one and I have tested and retested all the sql.
> I am stumped.
> Hopefully running on the server will improve the situation.
> You know, though, I am demoing the app for my client this afternoon so
maybe
> it is just a smelling fear thing.
> Thanks for the feedback you guys.
>
> -----Original Message-----
> From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com]
> Sent: Wednesday, May 28, 2003 8:35 AM
> To: Tomcat Users List
> Subject: RE: Tomcat STILL freezing - time to look at another app server?
>
>
> Howdy,
> That's unfortunate ;(  I've had tough issues that appeared to be random
> (like your network traffic hypothesis) and were very difficult to debug
> ;(
>
> I've tried many many containers / app servers, and always come back to
> tomcat.  This was even before I started contributing to tomcat's
> codebase, and is more true now than ever.
>
> So you are never able to reproduce the problem reliably?
>
> Yoav Shapira
> Millennium ChemInformatics
>
>
> >-----Original Message-----
> >From: Hunter, Sandra [mailto:Sandra_Hunter@BCTransit.Com]
> >Sent: Wednesday, May 28, 2003 11:26 AM
> >To: 'Tomcat Users List'
> >Subject: Tomcat STILL freezing - time to look at another app server?
> >
> >Well this issue continues. Code has been commented, logged, oracle
> >permissions all tickety boo, no locks.
> >
> >It really is intermittent, and in my opinion seems to be somewhat
> related
> >to
> >network traffic. I talked to one of the tech guys and he seemed to
> think I
> >was nuts.
> >
> >It never happens at night or on the weekends when I am pretty much the
> only
> >one on the network.
> >
> >Does that sound possible to any one with more experience than I?
> >
> >Although we moved it to the live server we had some install problems
> there
> >and so I am still running off my dev machine. It is just a regular P4
> with
> >about 1600mhz and 256 ram. Do you think the freezing will cease when
> >running
> >off the server?
> >
> >And on the other subject: have any of you tried other app servers out
> >there?
> >Do you have any opinions? Tomcat seems to be the industry standard but
> if I
> >can't resolve this freezing issue I might get some pressure to try some
> >different technology.
> >
> >-----Original Message-----
> >From: Hunter, Sandra [mailto:Sandra_Hunter@BCTransit.Com]
> >Sent: Friday, May 16, 2003 2:52 PM
> >To: 'Tomcat Users List'
> >Subject: RE: Tomcat Freezing?
> >
> >The lock may be an issue: I'll run that past our DBA but that's the
> only
> >thing I haven't looked at.
> >We have actually moved the app to another machine to see if that makes
> any
> >difference.
> >If anyone gets a bright idea I would love to hear it!
> >Puzzled Sandra
> >
> >-----Original Message-----
> >From: Jason Bainbridge [mailto:jason@jblinux.org]
> >Sent: Friday, May 16, 2003 12:11 PM
> >To: Tomcat Users List
> >Subject: Re: Tomcat Freezing?
> >
> >I'm running out of ideas myself... I gather this is quite a  beefy
> machine
> >you're running it on?
> >
> >Are you using the right version of the Oracle Thin Driver for the
> version
> >of
> >
> >Oracle you are running? Have you got a DBA on site or are you able to
> look
> >at
> >the appropriate v$ view to see what query it died on and possibly why?
> >
> >It's not something like not releasing a lock on a record or commits not
> >being
> >on or something silly like that in the Oracle config?
> >
> >Jason
> >
> >On Sat, 17 May 2003 02:29 am, Hunter, Sandra wrote:
> >> I spoke too soon. I am really stumped now.
> >> Code that ran yesterday, won't run today. I have gone through it line
> by
> >> line, commenting it all out, and then gradually adding in each line,
> and
> >> then it runs again. Same code. No changes.
> >> If I restart Tomcat the code will run. Sometimes. Other times not.
> >> I have looked at the Tomcat logs and I don't see anything that tells
> me
> >> anything.
> >> There must be some common event that is causing this but I can't seem
> to
> >> place it or find it.
> >> It almost seems like the code needs a warm up run before it can
> really
> >get
> >> going. How weird is that?
> >> Any idea what I should be looking for?
> >> Besides a psychiatrist?
> >> Sandra
> >>
> >> -----Original Message-----
> >> From: Hunter, Sandra [mailto:Sandra_Hunter@BCTransit.Com]
> >> Sent: Thursday, May 15, 2003 3:29 PM
> >> To: 'Tomcat Users List'
> >> Subject: RE: Tomcat Freezing?
> >>
> >> 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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> >> >
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> >> >
> >> >
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> >> >
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> >
> >--
> >Jason Bainbridge
> >KDE Web Team - http://kde.org
> >webmaster@kde.org
> >
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