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From "Craig R. McClanahan" <craig...@apache.org>
Subject Re: AW: Own Threads within TC ?
Date Fri, 01 Mar 2002 16:51:44 GMT


On Fri, 1 Mar 2002, Lauer, Oliver wrote:

> Date: Fri, 1 Mar 2002 17:47:11 +0100
> From: "Lauer, Oliver" <Oliver.Lauer@AXA.de>
> Reply-To: Tomcat Users List <tomcat-user@jakarta.apache.org>
> To: 'Tomcat Users List' <tomcat-user@jakarta.apache.org>
> Subject: AW: Own Threads within TC ?
>
> Thanks, good to know, is it ok to reference my ServletContext within 'my'
> threads ?
> Oliver
>

As long as the webapp is still running, that should be ok.

How do you know?  You should register a ServletContextListener that is
notified when the application is started and shut down.  (This is also a
good place to create and destroy the threads themselves.)

Craig


> > AXA eSolutions GmbH
> > AXA Konzern AG Germany
> > Oliver Lauer
> > Web Architect
> > Wörthstraße 34
> > D-50668 Köln
> > Germany
> > Tel.: +49 221 148 31277
> > Fax: +49 221 148 43963
> > Mobil: +49 179 59 064 59
> > e-Mail: Oliver.Lauer@axa.de
> > _____________________________
> >
>
>
> -----Ursprüngliche Nachricht-----
> Von: Craig R. McClanahan [mailto:craigmcc@apache.org]
> Gesendet: Freitag, 1. März 2002 17:42
> An: Tomcat Users List
> Betreff: Re: Own Threads within TC ?
>
>
>
>
> On Fri, 1 Mar 2002, Lauer, Oliver wrote:
>
> > Date: Fri, 1 Mar 2002 16:41:17 +0100
> > From: "Lauer, Oliver" <Oliver.Lauer@AXA.de>
> > Reply-To: Tomcat Users List <tomcat-user@jakarta.apache.org>
> > To: "Tomcat Users List (E-Mail)" <tomcat-user@jakarta.apache.org>
> > Subject: Own Threads within TC ?
> >
> > Hi,
> >
> > I know within an EJB container you mustn't use threads although in some
> you
> > can either. How is that topic related to TC.
> > I know I can use threads within TC but what does the spec. says about
> > threads ? I want to start some within a servlet's init() and stop those
> > using the destroy() method.
> >
> > Is that ok and allowed as well ?
> >
>
> Tomcat itself doesn't stop you from doing this (unless you run under a
> security manager with a policy that prohibits thread creation).  A couple
> of things to keep in mind:
>
> * Threads should normally be created as daemon threads
>   (thread.setDaemon(true) after creation).  Otherwise,
>   Tomcat will hang forever at shutdown time unless your
>   code correctly cleans up the threads it created.
>
> * It is not valid to keep a reference to objects provided
>   by the container (HttpServletRequest, HttpServletResponse)
>   beyond the scope of a particular call to the service()
>   method of your servlet.  You'll need to copy everything
>   you need out of these objects before the servlet call
>   finishes.
>
> > Thanks
> > Oliver
> >
>
> Craig
>
>
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