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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: How to configure to use tomcat and struts to use log4j?
Date Thu, 07 Aug 2003 13:41:23 GMT

Howdy,

>Looks like Struts has a dependency on Commons Logging which is using
>Log4j under the hood. The commons logging jar is being loaded from a
>"higher" level classloader (common/lib or server/lib) and can't access
>classes only provided by a "lower" classloader (your webapp).
>
>Maybe try having the commons logging jar in your WEB-INF/lib.

Not a bad suggestion.  Remember, you should always be able to have your
webapp work if you all your jars are in WEB-INF/lib and no jars are
elsewhere.

>> ----- Root Cause -----
>> java.lang.NoClassDefFoundError: org/apache/log4j/Layout

Note the difference between NoClassDefFoundError and
ClassNotFoundException.  The classloader found a log4j jar, but it does
not contain the Layout class.  List the contents of your WEB-INF/lib.

Yoav Shapira



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