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From Julien OIX <julien....@presidence.univ-nantes.fr>
Subject Re: Tomcat + Apache lifecycle question
Date Fri, 08 Feb 2002 14:12:30 GMT
Daniel Drasin a écrit :
> 
> I've set up Tomcat 4.x to work with Apache 1.3.x using the
> Warp connector stuff.  I followed the standard instructions for
> how to modify the httpd.conf file of apache, etc.  (All pretty
> straightforward...)  My problem is that i need to have a certain
> activity occur when Tomcat starts up.  This activity is to initialize
> a certain set of java objects and make them available to servlets.
> Because of classpath issues (i.e. classloaders) i was unable to use
> the lifecycle hooks of the contexts and had to settle for the
> (hackish) method of making a dummy servlet that only exists to
> have its <load-on-startup> value set (excerpt from the web.xml is
> below).  This servlet has an init() definition that initializes the
> objects in question (example definition below.)
> 
> The issue is that i need to have this activity occur once and only
> once - so i add a static flag into the init method to see if it's
> already run.  However, this doesn't work.  When i start tomcat,
> the initialization code runs and when i start apache, it runs
> again - despite the flag.  (Output included below).
> 
> My guess is that the flag doesn't help because these init() calls
> are occuring in two different object spaces (class loaders) so the
> flag really is false both times.
> 
> So my question is - what's going on here.  Fundamentally, how can
> i achieve my goal outlined in paragraph 1.  At a deeper level, my
> question is - why do i get two calls to startup?  Is tomcat starting
> a new context for apache?  If so, why doesn't it use the one that
> it's already started?  Is there a way to surpress the starting of
> one of the contexts?
> 
> Any help is appreciated
> 
> Dan
> -------------------------CODE AND OUTPUT---------------------------
> 
> ...
>     <servlet>
>       <servlet-name>
>           ServletTest
>       </servlet-name>
>       <servlet-class>
>           ServletTest
>       </servlet-class>
>       <load-on-startup>0</load-on-startup>
> ...
> 
> ...
> public class ServletTest extends HttpServlet {
>     static int i = 0;
>     static boolean flag = false;
>     static {
>         i++;
>         if(!flag) {
>          flag = true;
>          System.out.println("***********GOT " + i + " **************");
>       }
>     }
> ...
> 
> ...
> Starting service Tomcat-Standalon
> Apache Tomcat/4.0.1
> ***********GOT 1 **************

delete this service ( everything in the right <Service> section ) from
server.xml

hope this helps 


> Starting service Tomcat-Apache
> Apache Tomcat/4.0.1
> ***********GOT 1 **************
> ...
> 
> --
>         Daniel Drasin                           Applied Reasoning
>         drasin@appliedreasoning.com             8612 Long Meadow Ct.
>         (410)-461-6168                          Columbia, MD, 21045
>         http://www.appliedreasoning.com
> 
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-- 
Julien OIX
Service Informatique de Gestion
Tél: 02 40 99 83 65
mail: julien.oix@presidence.univ-nantes.fr

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