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From "Mark Faircloth" <>
Subject Log4j errors on Tomcat6 startup
Date Fri, 13 Jul 2007 10:23:27 GMT


We are in the process of migrating from 5.5 to 6 under Win32/64 and need
to alter the locations of some of our jars files because of the changes
to the directory structure and the class loading. 


Under 5.5 we have commons-logging.jar and log4j.jar in WEB-INF\lib and
that works fine. For 6 we have put commons-logging and log4j.jar into
\lib otherwise it fails on loading any context listeners. We also have a
copy of log4j.jar still in WEB-INF\lib for webapp specific logging
pretty much as the documentation states.


This all runs okay and we get the output we would expect but on start-up
we get errors in the stdout log such as:


log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is not
assignable to a "org.apache.log4j.Appender" variable.

log4j:ERROR The class "org.apache.log4j.Appender" was loaded by 

log4j:ERROR [org.apache.catalina.loader.StandardClassLoader@bbe0f0a]
whereas object of type 

log4j:ERROR "org.apache.log4j.DailyRollingFileAppender" was loaded by

  delegate: false



----------> Parent Classloader:



log4j:ERROR Could not instantiate appender named "MAIN".



Understandably considering we are class loading in two places. My
question is, are these error messages really benign and can we get rid
of them somehow or are we doing something wrong and need to investigate


Many thanks





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