RE: newbie - finding class files

["P.van Kemenade" <pi...@v2.nl>]

Hi

I found this old thread about extending WebdavServlet,
in which Andreas Probst notes his webapp cant load classes
from the $CATALINA_HOME/servlet/lib/ dir.

this url
	http://jakarta.apache.org/tomcat/tomcat-4.0-doc/class-loader-howto.html
makes it clear why.

but now: how should I  extend WebdavServlet inside my webapp ?
If i put my own classes in the org.apache.bla package, it can't load
the classes from my webapp, ofcourse.

should I copy all jar files from  $CATALINA_HOME/servlet/lib/*jar
to my webapps /WEB-INF/lib ?

  that should work, but it sounds ugly.



>
> On Tue, 16 Jul 2002, Andreas Probst wrote:
>
> > Date: Tue, 16 Jul 2002 13:59:49 +0200
> > From: Andreas Probst <an...@gmx.net>
> > Reply-To: Tomcat Users List <to...@jakarta.apache.org>
> > To: tomcat-user@jakarta.apache.org
> > Subject: RE: newbie - finding class files
> >
> >
> > > On Mon, 15 Jul 2002, Andreas Probst wrote:
> > >
> > > >
> > > > Hi all,
> > > >
> > > > does Tomcat really look into tomcatdir/server/lib? For me it  
> seems
> > > > Tomcat doesn't.
> > > >
> > >
> > > This directory is only visible to the classloader for Tomcat  
> itself, not
> > > for webapps.  There is a special rule that makes servlet classes in
> > > package "org.apache.catalina" available to webapps anyway,  
> however, which
> > > is why the standard WebdavServlet (as well as the other Tomcat  
> features
> > > that are available via servlets) can be loaded.
> > >
> > > Craig
> >
> > Thank you Craig.
> >
> > Could you please tell more about the rule or give a pointer. The
> > class-loader-info of the Tomcat-Docu says nothing about the rule, but
> > says, that "These classes and resources are TOTALLY invisible to web
> > applications".
> >
>
> Actually, the rule is very simple, and it is there in the docs.  Look  
> at
> the picture of the class loader hierarchy in the Tomcat docs:
>
>    
> http://jakarta.apache.org/tomcat/tomcat-4.0-doc/class-loader-> howto.html
>
> The classes that are visible to a web application are those in the  
> class
> loader for that webapp, and any of it's parent class loaders.  In other
> words, an application can see the "WebappX" class loader for itself,  
> plus
> the "Shared", "Common", "System", and "Bootstrap" class loaders.  It  
> can
> *not* see the "Catalina" class loader.


thanks,
*-pike
-----------------------
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