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From Magnus Larsgården <ma...@kbab.net>
Subject Re: Multiple instances of servlets
Date Fri, 16 Jun 2006 17:37:16 GMT
Hi Len,

The SingleThreadModel Interface is _not_ used in the servlet.

Maybe I should write a bugreport?

Thanks for your help!

BR/Magnus




----- Original Message ----- 
From: "Len Popp" <len.popp@gmail.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Friday, June 16, 2006 6:30 PM
Subject: Re: Multiple instances of servlets


I don't see anything there that would cause the servlet in mydomain2
to be loaded 4 times. The only thing I can think of is that the
servlet might be running in single-thread mode (by implementing the
SingleThreadModel interface).
-- 
Len

On 6/14/06, Magnus Larsgården <mason@kbab.net> wrote:
> Hi Len!
>
> This is how my two web.xml files look like:
>
> /home/web/tomcat/webapps/ROOT/WEB-INF/web.xml
>
>     <!--
> ******************************************************************  -->
>     <!--
> ******************************************************************  -->
>     <servlet>
> 
> <servlet-name>com.mydomain1.bookingManager.BookingManager</servlet-name>
> 
> <servlet-class>com.mydomain1.bookingManager.BookingManager</servlet-class>
>         <load-on-startup>1</load-on-startup>
>     </servlet>
>     <servlet-mapping>
> 
> <servlet-name>com.mydomain1.bookingManager.BookingManager</servlet-name>
> 
> <url-pattern>/servlet/com.mydomain1.bookingManager.BookingManager</url-pattern>
>     </servlet-mapping>
>
>
>     <!--
> ******************************************************************  -->
>     <!--
> ******************************************************************  -->
>     <servlet> -->
>       <servlet-name>com.mydomain1.log.Log</servlet-name>
>       <servlet-class>com.mydomain1.log.Log</servlet-class>
>     </servlet>
>     <servlet-mapping>
>         <servlet-name>com.mydomain1.log.Log</servlet-name>
>         <url-pattern>/servlet/com.mydomain1.log.Log</url-pattern>
>     </servlet-mapping>
>
>     <!--
> ******************************************************************  -->
>     <!--
> ******************************************************************  -->
>     <servlet> -->
>       <servlet-name>com.mydomain1.poll.PollMain</servlet-name>
>       <servlet-class>com.mydomain1.poll.PollMain</servlet-class>
>     </servlet>
>     <servlet-mapping>
>         <servlet-name>com.mydomain1.poll.PollMain</servlet-name>
>         <url-pattern>/servlet/com.mydomain1.poll.PollMain</url-pattern>
>     </servlet-mapping>
>
>     <!--
> ******************************************************************  -->
>     <!--
> ******************************************************************  -->
>     <servlet> -->
> 
> <servlet-name>com.mydomain1.discgolf.bookingManager.BookingManager</servlet-name>
> 
> <servlet-class>com.mydomain1.discgolf.bookingManager.BookingManager</servlet-class>
>       <load-on-startup>2</load-on-startup>
>     </servlet>
>     <servlet-mapping>
> 
> <servlet-name>com.mydomain1.discgolf.bookingManager.BookingManager</servlet-name>
> 
> <url-pattern>/servlet/com.mydomain1.discgolf.bookingManager.BookingManager</url-pattern>
>     </servlet-mapping>
>
>     <!--
> ******************************************************************  -->
>     <!--
> ******************************************************************  -->
>     <servlet> -->
>       <servlet-name>com.mydomain1.discgolf.poll.PollMain</servlet-name>
>       <servlet-class>com.mydomain1.discgolf.poll.PollMain</servlet-class>
>     </servlet>
>     <servlet-mapping>
>         <servlet-name>com.mydomain1.discgolf.poll.PollMain</servlet-name>
> 
> <url-pattern>/servlet/com.mydomain1.discgolf.poll.PollMain</url-pattern>
>     </servlet-mapping>
>
>
>
> /home/web/tomcat/webapps/mydomain2/WEB-INF/web.xml
>
>     <!--
> ******************************************************************  -->
>     <!--
> ******************************************************************  -->
>     <servlet>
> 
> <servlet-name>com.mydomain2.bookingManager.BookingManager</servlet-name>
> 
> <servlet-class>com.mydomain2.bookingManager.BookingManager</servlet-class>
>         <load-on-startup>1</load-on-startup>
>         <!-- <load-on-startup>1</load-on-startup> -->
>     </servlet>
>     <servlet-mapping>
> 
> <servlet-name>com.mydomain2.bookingManager.BookingManager</servlet-name>
> 
> <url-pattern>/servlet/com.mydomain2.bookingManager.BookingManager</url-pattern>
>     </servlet-mapping>
>
>
>
> As I mentioned earlier it is mydomain2 that get four instances of the
> "BookingManager" servlet.
>
> Comments?
>
> Thanks
> /Magnus
>
>
>
>
>
>
>
> ----- Original Message -----
> From: "Len Popp" <len.popp@gmail.com>
> To: "Tomcat Users List" <users@tomcat.apache.org>
> Sent: Wednesday, June 14, 2006 4:44 PM
> Subject: Re: Multiple instances of servlets
>
>
> How many web.xml files do you have, and how many <servlet>
> declarations are there in those files? Each one of those is a
> different servlet (even if some of them happen to be implemented by
> similar Java classes). Normally, Tomcat will create one instance of
> each of those servlets (or one per JVM in a distributed application).
> Things are different if you use the single-thread model, but that's
> not recommended.
>
> See the servlet spec for the official details.
> --
> Len
>
> On 6/14/06, Magnus Larsgården <mason@kbab.net> wrote:
> > Hi all,
> >
> > Is Tomcat supposed to create multiple instances of my servlet at 
> > startup?
> > Or
> > is it a bug?
> >
> > Background:
> > ========
> > I have two different domains connected to my Tomcat server (version
> > 5.5.17):
> > http://mydomain1.host.com  and
> > http://mydomain2.host.com
> >
> > "mydomain1" is directed to /home/web/tomcat/webapps/ROOT/
> > and "mydomain2" is directed to /home/web/tomcat/webapps/mydomain2/
> >
> > Both domains use a copy of the same servlet except that they belong to
> > different packages. Ex:
> > The .java files under mydomain1 belong to package
> > "com.mydomain1.bookingManager"  and are located under
> > /home/web/tomcat/webapps/ROOT/WEB-INF/classes/com/mydomain1/bookingManager/
> >
> > The .java files under mydomain2 belong to package
> > "com.mydomain2.bookingManager" and are located under
> > /home/web/tomcat/webapps/mydomain2/WEB-INF/classes/com/mydomain2/bookingManager/
> >
> > Problem:
> > ======
> > When Tomcat starts it creates only ONE instance of the
> > "mydomain1" -servlet,
> > and FOUR instances of the "mydomain2" servlet.
> > I would really like to only have ONE instance of each servlet. How can I
> > achieve this?
> >
> > I have searched Google for answers but only found contradicting
> > statements.
> > Some say that Tomcat creates one, and only one instance of each servlet.
> > Other say the opposite.
> >
> >
> > All help is appreciated!
> >
> > Thanks in advance
> > BR/Magnus
> >
> >
> >
> >
> >
> >
> >
> > ---------------------------------------------------------------------
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> >
> >
>
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