Re: Tomcat hangs, what to do to diagnose the problem?

[Jim Cox <sh...@gmail.com>]

On 9/27/07, Wm.A.Stafford <st...@marine.rutgers.edu> wrote:
> Our Tomcat 4.1.30 instance seems to hang about once a week. i.e. the
> application is unresponsive and it can not be restarted from the
> management console.  Tomcat must be restarted to restore functionality.
> There is nothing in the logs to indicate explicitly what is going on.
> The only logging that may be diagnostic is what gets logged when we
> attempt to restart the hung application.
>
> 2007-09-27 10:49:55 HTMLManager: restart: Reloading web application at
> '/OWEB'
> 2007-09-27 10:49:55 StandardContext[/OWEB]: Reloading this Context has
> started
> 2007-09-27 10:49:55 StandardWrapper[/OWEB:ControllerServlet]: Waiting
> for 66 instance(s) to be deallocated
>
> I'm not sure what this means but if there are 66 instances of the
> applications controller servlet that could be a clue as to what is going
> on.  There should be only one.
>
> This instance of Tomcat is running only our application.  We did not see
> this behavior with the previous release.  We do not see the behavior on
> any of the three development/test machines.
>
> Along with a new release we moved from Java 1.4 to Java 5.0.  The server
> in question is running Linux.
>
> Can anyone suggest diagnostics to tell what is going on?
> Are there any known scenarios that result in this 'hung' behavior?
>
> Thanks for any guidance,
> -=bill
>
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Does that version of Tomcat leak OS resources (e.g. file handles) when
reloading webapps (v. a server stop/start)?

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