Thank you, Chris, in catalina.properties file, I also saw shared.loader 
property,  as you know, the TC7 doc says "System", "Common", and "Webapp" 
classloaders. If "common.loader" map to common classloader, what 
"shared.loader" get map to? 
And are those  ${catalina.base} and ${catalina.home} built-in placeholder for 
TC7?

> Date: Thu, 28 Apr 2011 11:06:01 -0400
> From: ch...@christopherschultz.net
> To: users@tomcat.apache.org
> Subject: Re: tomcat 7: is it possible to config tomcat common classloader to 
> point to other location?
> 
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> Yongqin,
> 
> On 4/26/2011 6:57 PM, Yongqin Xu wrote:
> > I am using TC 7, and the doc says, TC common classloader load
> > $CATALINA_HOME/lib for thosecommonly shared lib jar files. Is it
> > possible for me to config it pointing to other location? I know ifI
> > define $CATALINA_BASE to point to a outside location, will
> > $CATALINA_BASE/lib be used for TCcommon classloader to pick up there?
> 
> Take a look at conf/catalina.properties:
> 
> common.loader=${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,${catalina.home}/lib/*.jar
> 
> Looks like both are used.
> 
> You can define this property to be anything you'd like, including adding
> another directory somewhere else without disturbing anything.
> 
> Note that changing catalina.properties will be surprising to anyone who
> tries to debug your Tomcat installation after you move-on to another
> job. So, be sure to explicitly document what you're doing.
> 
> - -chris
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> =kfal
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