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Subject: RE: CGI ...yeah, I know (Tomcat 4.1.29)
Date: Tue, 9 Nov 2004 08:51:44 -0500
Message-ID: <9C5166762F311146951505C6790A9CF80229C5CB@US-VS1.corp.mpi.com>
Thread-Topic: CGI ...yeah, I know (Tomcat 4.1.29)
Thread-Index: AcTGXjiRO3iLssR2QXWIeJJfuzDVsQABJ9GQ
From: "Shapira, Yoav" <Yoav.Shapira@mpi.com>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>


H=
i,

>I still have one question though,
>
>How come when I copied the source from 4.1.31 directly into my own
class
>(with no dependencies) I got ClassNotFound exceptions and it would no=
t
run

Was it really a CNFE or a NoClassDefFoundError?  

You have to be very careful with dependencies once you start putting
stuff in shared, common, and server classloader repositories.  That's
why I recommend never doing that, and just keeping everything in your
WEB-INF/lib directory.

The reason you must be very careful is that class com.foo loaded from
shared/lib is not the same as com.foo loaded from common/lib or
WEB-INF/lib.  A class is unique within its classloader, and these are
distinct classloaders.  This leads to problems with applications that
package classes such that some classes are in more than one repository=
,
or that require upwards (common/lib needing WEB-INF/lib for example)
repository lookups.  No-no.

Yoav


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