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From Elias Kopsiaftis <yemi...@gmail.com>
Subject Re: tomcat randomly undeploys and redeploys the applications
Date Wed, 02 Apr 2014 15:01:27 GMT
Chuck,

Thanks for your response. I will get you all the information you asked for
later tonight when I get out of work. In the meantime, the only threads our
application creates are those created by a ScheduledThreadPoolExecutor, and
in fact, when I do a thread dump to analyze what is going on, there are 30
threads associated with this executor that are in a BLOCKED state. We have
had trouble with executors in the past, but these threads are supposed to
be running for the lifecycle of the application. Is there a problem using
an executor in a tomcat application? I will provide you with the following
later today: Tomcat version, JRE version, platform, server.xml (with
comments removed), context.xml for the webapp, etc. Would you like me to
also attach the thread dump?


On Wed, Apr 2, 2014 at 8:21 AM, Caldarale, Charles R <
Chuck.Caldarale@unisys.com> wrote:

> > From: Elias Kopsiaftis [mailto:yemista@gmail.com]
> > Subject: tomcat randomly undeploys and redeploys the applications
>
> > I deploy the application, then in the log file catalina.out i get many
> > messages from WebappClassLoader clearReferencesThreads saying threads
> > appear to have started but have failed to stop
>
> This is an indication that your webapp is not managing its threads
> properly.
>
> > then finally, Ill get a message from HostConfig checkResources that
> > says its undeploying the context, and then it redeploys.
>
> This is sometimes caused by incorrect timestamps on the bits of the webapp
> that Tomcat monitors, or an incorrect clock setting on the system Tomcat is
> running on.  The mismatch makes it appear that the webapp is being updated
> continuously.
>
> If you want anything more than speculation, you'll need to provide real
> information: Tomcat version, JRE version, platform, server.xml (with
> comments removed), context.xml for the webapp, etc.
>
>  - Chuck
>
>
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