Hi Cam,
Servlets don't "have threads".
Tomcat as a whole has a pool of threads for serving
incoming requests (see the <Connector> tag in
$TOMCAT_HOME/conf/server.xml).
Unless you do something unusual, tomcat creates
*one* instance of your servlet, and only one.
Any *tomcat* request-serving thread which happens to
need to run your servlet as part of a request just goes
ahead and calls the service method (doGet/doPost) on
the single servlet instance. If some other thread is already
inside the instance, then the normal synchronization
mechanisms are applied - synchronized methods can
have only one thread in them, but "normal" methods
are just run by the multiple threads in parallel, etc.
So, does your servlet declare some critical method
to be "synchronized"? If so, this is the reason that
multiple client requests can't be served in parallel. If
not (and you haven't deliberately turned down the size
of the tomcat thread pool to 1), then I cannot think of
any other reason for the behaviour you are seeing.
As far as I know, there is no standard method of
telling any servlet-spec-compliant system to create
a "pool" of servlet instances, and run different requests
using different instances. There really isn't any point in
such a mechanism, because if you've bothered to
declare "synchronized" methods on the servlet, that
implies that there is data which *needs* to be shared
across threads - so a pool of objects would break any
code that needs synchronized methods anyway. If
you *do* have a major servlet method "synchronized",
then you need to think about **why** you declared it
like that, and if possible get rid of the declaration (maybe
you can just synchronize a smaller block of code?)
Cheers,
Simon
> -----Original Message-----
> From: Algarve, Leila [SMTP:[EMAIL PROTECTED]]
> Sent: Monday, January 08, 2001 12:08 PM
> To: '[EMAIL PROTECTED]'
> Subject: AW: Servlet and Multiple Instances
>
> Check if your servlet class implements SingleThreadModel, in this case one
> instance of the servlet will be able to handle just one request.
>
> Leila
>
>
> -----Ursprüngliche Nachricht-----
> Von: Cam DeBuck [mailto:[EMAIL PROTECTED]]
> Gesendet: Montag, 8. Januar 2001 07:12
> An: [EMAIL PROTECTED]
> Betreff: Servlet and Multiple Instances
>
>
> I've written a servlet that is getting hit pretty hard. It works fine
> when
> just one user access hit. However, when they are multiple people hitting
> the servlet, it seems like that it is only serving one person at a time.
> Is
> there some confirguration option that I am missing so that it can spawn
> multiple threads. Any help would be appreciated. Thanks.
> --Cam--
>
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