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From "Michael Forster" <>
Subject RE: Load class from different web app
Date Fri, 04 Nov 2005 12:26:18 GMT
That is not strictly true, We had an application at work that used JNI and
was part of a Database access library as well as accessing things like the
Machines Hostmac address.

We could not run it from the Tomcat area and had to put it into a jar file
and put the jar file into the JVM jdk/jre/lib/ext dir and then it worked
fine as any classes / libraries in that dir are loaded by the JVM meaning
they are always available - This is also where we put the JDBC driver jar.


-----Original Message-----
From: Tim Funk []
Sent: 04 November 2005 11:32
To: Tomcat Users List
Subject: Re: Load class from different web app

You are violating the servlet spec. Do not pass go, do not collect $200.

Classes for a webapp need to be in WEB-INF/classes and WEB-INF/lib. Tomcat
does allow for webapps to share classes via the $CATALINA_HOME/shared and
$CATALINA_HOME/common directories but you'll need to see the classloader
on any restrictions.


Steven Nakhla wrote:

> I'm writing a web application (a portal app, to be specific) that needs to
> be able to load a class (using Class.forName(...)) that was deployed in a
> different web application from the one I am developing. I've deployed the
> target web app containing the class I want to load, but whenever I call
> Class.forName(), I get a "java.lang.ClassNotFoundException". Is there
> anything special I need to do if I want to load this class? It appears it
> a classloader issue, but I don't know enough to determine what the problem
> is. Any help is greatly appreciated!
> Steve Nakhla

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