How to avoid that log4j classes are loaded twice

[Charles Moulliard]

Hi,

When Karaf is deployed as a WAR in Jetty or Tomcat, log4j classes are 
loaded twice and of course Karaf is not able to report trace in 
servicemix.log file.

log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not 
assignable to a "org.apache.log4j.Appender" variable.
log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
log4j:ERROR [4.0] whereas object of type
log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by 
[contextloa...@servicemix Embedded Example].
log4j:ERROR Could not instantiate appender named "A1".
log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not 
assignable to a "org.apache.log4j.Appender" variable.
log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
log4j:ERROR [4.0] whereas object of type
log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by 
[contextloa...@servicemix Embedded Example].

Does anybody has an idea to avoid that ?

Regards,

Charles