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From "David Frankson" <>
Subject Re: Tomcat Hanging
Date Mon, 01 Oct 2001 18:30:56 GMT
    Do a thread dump on the hanging process.  Its CTRL-BREAK on a windows
machine, I'm not sure of the Solaris equivalent command.  It will likely
show a few objects waiting indefinitely for some resource.  In my experience
it has always been my own code that trips up tomcat.


----- Original Message -----
From: "Jeremy P" <>
To: <>
Sent: Monday, October 01, 2001 12:42 PM
Subject: Tomcat Hanging

> Hi all,
> I am having some trouble with a fleet of production
> tomcat servers.  The servers are running Tomcat 3.2.3
> in a fairly high-volume system (approx. 500,000
> requests per day) on Solaris 8 using JDK1.3.1 .  After
> starting the servers. They run fantastically for about
> 20 minutes, with no signs of being slow due to load or
> any other problems.  After this 20 minutes, they hang
> completely.  Running top on the machines shows that
> they drop off the CPU list completely.  Running
> netstat shows that all connections are stuck in the
> ESTABLISHED state.  Sometimes it takes longer than 20
> minutes, sometimes less, but eventually it will hang
> in the described state.  This problem occurs both when
> running tomcat in standalone operation and via the
> Apache module.  I have seen a few bug reports
> describing similiar problems but they all say they
> were fixed prior to 3.2.3.  Furthermore, I have even
> switched one of the machines to Tomcat 4 to see if
> that would fix the problem, but it did not.  Has
> anyone encountered similiar problems, or have any
> suggestions as to what may be the cause.
> Thanks
> Jeremy
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