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From Boris Unckel <>
Subject Re: Classloading scenario
Date Tue, 20 Feb 2007 14:02:40 GMT

Angel Todorov wrote:
> I have the following scenario: one webapp, which has some jars in its
> private WEB-INF\lib dir, and one common jar which I would like to
> share among several webapps. Hence, I am putting this jar into the
> shared\lib directory of Tomcat. The problem is that this common lib
> references classes which are in jars in the first webapp's WEB\lib
> directory. Therefore, I get NoClassDefFoundErrors when this common jar
> loads and tries to refer classes from the webapp's private lib.
> Is it possible to achieve a workaround with tomcat's classloading for
> that custom scenario?
there is no workaround, but a better strategy and best practise:
Put *all* JARs of a webapp into WEB-INF/lib, if there is not
a strong usecase or technical reason to do otherwise (i.E. some JDBC drivers
should be put into common/lib or shared/lib).

Sharing classes causes definitly more problems than it solves.


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