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 <[EMAIL PROTECTED]>
> Reply-To: Tomcat Users List <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> 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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