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From Nick Bauman <nixnix...@yahoo.com>
Subject Re: Bug found when calling init methods of defined web apps
Date Thu, 27 Jul 2000 23:18:40 GMT
So this bug:

http://localhost:8888/BugRatViewer/ShowBug/3

could be closed in this case?

--- "Craig R. McClanahan"
<Craig.McClanahan@eng.sun.com> wrote:
> Dan Martens wrote:
> 
> > Hello all.
> > This is my first message to this group so please
> let me know if you have
> > heard of this behaviour before.  There is a bug in
> > org.apache.tomcat.core.ContextManager which allows
> for the loading of every
> > defined servlet in the web.xml file four times at
> startup.
> 
> If you are talking about the "conf/web.xml" file,
> and you have four web
> apps in your
> "webapps" directory, what you are seeing is actually
> the correct
> behavior.  To understand
> why, consider the following points:
> 
> * The "conf/web.xml" file in Tomcat 3.1 contains
> defaults that are
>   common to all web applications.  When a context is
> started up,
>   this file is read and processed before the
> "WEB-INF/web.xml" file
>   for your own application is processed.  You can
> pretend that there
>   is an invisible "include" for this file at the top
> of your
> application's
>   web.xml file, if that makes things clearer.
> 
> * By the rules of the servlet specification, every
> single <servlet>
>   definition that is processed from a "web.xml" file
> must cause the
>   creation of a separate servlet instance (of the
> appropriate class).
>   This would be true even if you had two <servlet>
> instances that
>   named the same Java class file.  The reason you
> want this is that
>   you may well have the same servlet class, under
> two different
>   mappings, with two different sets of
> initialization parameters.
> 
> * Because the "conf/web.xml" file contains commonly
> used servlets
>   (like the JSP page compiler servlet), an instance
> of that servlet
>   gets created for each web application.
> 
> * This is a "good thing", because each web
> application has its own
>   custom class path (to access the WEB-INF/classes
> and WEB-INF/lib
>   directories of each application).  If Tomcat were
> changed in the way
>   that you are describing, the JSP page compiler for
> all four web apps
>   would reference only the classes from the web app
> that was initialized
>   first.
> 
> Craig McClanahan
> 
>
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=====
# Nick Bauman
# Technical Programmer
# http://webhelp.com
# real software, real code, real time

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