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From "Jacob Kjome" <h...@visi.com>
Subject Re: object is not assignable to a "org.apache.log4j.Layout"
Date Fri, 05 Oct 2007 17:17:17 GMT

Is the library containing your custom layout class in the same classloader as 
Log4j?  For instance, did you used to package your custom layout and log4j.jar 
in WEB-INF/lib, but now have removed log4j.jar from WEB-INF/lib and host it in 
common/lib.  In this situation, Log4j would not be able to to use your custom 
layout because it's in a classloader it can't see.  This could also occur if 
you put Log4j.jar and your custom layout in common/lib and then your custom 
layout also in WEB-INF/lib, but not log4j.jar.

The main thing to remember is, put any Log4j dependencies (compile or runtime) 
alongside log4j.jar.  If you have log4j.jar in common/lib, then also put your 
custom layout there.  If, in addition to the latter, you have either Log4j.jar 
or your custom layout in WEB-INF/lib, make sure both exist there.


On Fri, 5 Oct 2007 01:01:20 -0700 (PDT)
  Zmaj <mungoparks@gmx.de> wrote:
> Hello,
> since today we have all ogf a sudden a curious problem when trying to deploy
> our app in tomcat.
> The deploy fails and the logfile shows this error:
> log4j:ERROR A "de.mun.support.log.MunHTMLLayout" object is not assignable to
> a "org.apache.log4j.Layout" variable.
> log4j:ERROR The class "org.apache.log4j.Layout" was loaded by 
> log4j:ERROR [WebappClassLoader
>  delegate: false
>  repositories:
>    /WEB-INF/classes/
> ----------> Parent Classloader:
> org.apache.catalina.loader.StandardClassLoader@106fc94
> ] whereas object of type 
> log4j:ERROR "de.mun.support.log.MunHTMLLayout" was loaded by
> [WebappClassLoader
>  delegate: false
>  repositories:
>    /WEB-INF/classes/
> ----------> Parent Classloader:
> org.apache.catalina.loader.StandardClassLoader@106fc94
> ].
> log4j:ERROR No layout set for the appender named [HTML].
> The strange thing about this is that we never had problems with
> our own layout before and no idea what is responsible for this.
> Any help would be great.
> thanks
> ivan
> -- 
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